Sam LeachBryant Kesler
Published © GPL3+

IoT Dog Bowl and Dog Food Scale

This dog bowl and food system is connected to an IoT scale that measures how much dog food is left in the bowl and the food bag.

IntermediateFull instructions provided13 hours873
IoT Dog Bowl and Dog Food Scale

Things used in this project

Hardware components

Photon
Particle Photon
×2
SparkFun Load Cell Amplifier - HX711
SparkFun Load Cell Amplifier - HX711
×2
load cell
×2
Breadboard (generic)
Breadboard (generic)
×2

Software apps and online services

Maker service
IFTTT Maker service
Particle Build Web IDE
Particle Build Web IDE
Fritzing

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Optional for casing
Soldering iron (generic)
Soldering iron (generic)
Solder Flux, Soldering
Solder Flux, Soldering

Story

Read more

Custom parts and enclosures

Casing Creo File

This is the .prt creo file that was used to 3d print the casing for each of the scales.

Schematics

Circuit for a single scale (Identical for each scale!)

Code

iotscale.ino

C/C++
Source code for Scale1 (bowl scale)
#include <HX711ADC.h>
#include "Adafruit_SSD1306.h"

#define OLED_RESET D4
Adafruit_SSD1306 display(OLED_RESET);

#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH  16
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

//HX711 Pin Hookup
#define SCK A3
#define DT A2

//Initialize scale
HX711ADC scale(DT,SCK);

double prevScaleValue;
double scaleValue;
double fullWeight = 100;
double lockWeight;
bool locked = false;
int lockedInt = 0;

bool updatePrev = true;
double seenWeight;
int numTimesSeen;

int tareScale(String command);
double absValue(double value);
int setFullWeight(String command);
int lockScale(String command);

bool flag = false;

void setup(){
  Serial.begin(9600);
  Particle.variable("scaleValue", scaleValue);
  Particle.variable("lockedInt", lockedInt);
  Particle.function("setFull", setFullWeight);
  Particle.function("tareScale", tareScale);
  Particle.function("lockScale", lockScale);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();

  scale.set_scale(107.32);//Calibrates scale (See calibration instructions)

  Serial.println(scale.get_units());
  scale.tare();
  Particle.subscribe("scaleValue2", myHandler, MY_DEVICES);
  
}
//checks subscrive data and sets flag based on scale value
void myHandler(const char *event, const char *data)
{
  if(strcmp(String(data),"good")==0 && scaleValue < 100){
     flag=true;}
  else if(strcmp(String(data),"good")==0 && scaleValue > 100){
     flag=false;
  }
}


void loop(){
  scale.power_up();
  //Check for a change in weight and send event
  if(scaleValue > prevScaleValue+2 || scaleValue < prevScaleValue - 2){
    Particle.publish("weightChange",String(scaleValue), PRIVATE);
  }
  
  if(locked && (scaleValue > prevScaleValue +2 || scaleValue < prevScaleValue -2)){
    updatePrev = false;
    numTimesSeen++;
    if(numTimesSeen >=2){
      updatePrev = true;
      numTimesSeen = 0;
      Particle.publish("lockWtChange");
    }
  }

  //Get new Readings
  if(updatePrev){
    prevScaleValue = scaleValue;
  }
  scaleValue = scale.get_units(5);
  scaleValue = absValue(scaleValue);

  //Update Display
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.printf("Wt:%2d g", (int)scaleValue);
  display.setTextSize(1);
  display.printf("\n\nFull: %2d g", (int)fullWeight);
  if(locked){
    display.printf("\n\n\nLocked at %2d g", (int)lockWeight);
  }
  display.display();
  delay(1000);
  //checks scale value and publishes to the cloud
  if(scaleValue < 100){
    Particle.publish("scaleValue1","bad",PRIVATE);
    //publish flag data for trouble shooting
    Particle.publish("flag", String(flag), PRIVATE);
    
  }
  //checks for flag status and reports to the cloud
  if(flag==true){
     Particle.publish("Feed Me",String(scaleValue)+"g");
  }


  //Serial.print(scaleValue);Serial.println("g");

  scale.power_down();
  //delay(43200000);
  int startTime = millis();
  while(true){
    if(millis()-startTime >= 43200000){
      break;
    }
  }
}


int tareScale(String command){
  scale.tare();
  delay(100);
  Serial.println("Scale Teared From Cloud!!");
  return 1;
}

int setFullWeight(String command){
  fullWeight = scaleValue;
  return fullWeight;
}

int lockScale(String command){
  locked = !locked;
  lockWeight = scaleValue;

  if(locked){
    lockedInt = 1;
    return lockWeight;
  }else{
    lockedInt = 0;
    return -1;
  }
}

//Not really working right now
double absValue(double value){
  double newValue = 0;
  if(value < 0){
    newValue = -1*value;
    return newValue;
  }
  return value;
}

iotscale2.ino

C/C++
Source Code for Scale2 (bag scale)
#include <HX711ADC.h>
#include "Adafruit_SSD1306.h"

#define OLED_RESET D4
Adafruit_SSD1306 display(OLED_RESET);

#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH  16
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

//HX711 Pin Hookup
#define SCK A3
#define DT A2

//Initialize scale
HX711ADC scale(DT,SCK);

double prevScaleValue;
double scaleValue;
double fullWeight = 100;
double lockWeight;
bool locked = false;
int lockedInt = 0;

bool updatePrev = true;
double seenWeight;
int numTimesSeen;

int tareScale(String command);
double absValue(double value);
int setFullWeight(String command);
int lockScale(String command);

bool flag=false;

void setup(){
  Serial.begin(9600);
  Particle.variable("scaleValue", scaleValue);
  Particle.variable("lockedInt", lockedInt);
  Particle.function("setFull", setFullWeight);
  Particle.function("tareScale", tareScale);
  Particle.function("lockScale", lockScale);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();

  scale.set_scale(107.32);//Calibrates scale (See calibration instructions)

  Serial.println(scale.get_units());
  scale.tare();
  Particle.subscribe("scaleValue1", myHandler, MY_DEVICES);
}
//checks the subscribe data and sets the flag based on the scale value
void myHandler(const char *event, const char *data)
{
  if(strcmp(String(data),"bad")==0 && scaleValue < 1000){
     flag=true;}
  else if(strcmp(String(data),"bad")==0 && scaleValue > 1000){
     flag=false;
}
}

void loop(){
  scale.power_up();
  //Check for a change in weight and send event
  if(scaleValue > prevScaleValue+2 || scaleValue < prevScaleValue - 2){
    Particle.publish("weightChange", String(scaleValue), PRIVATE);
  }
  if(locked && (scaleValue > prevScaleValue +2 || scaleValue < prevScaleValue -2)){
    updatePrev = false;
    numTimesSeen++;
    if(numTimesSeen >=2){
      updatePrev = true;
      numTimesSeen = 0;
      Particle.publish("lockWtChange");
    }
  }

  //Get new Readings
  if(updatePrev){
    prevScaleValue = scaleValue;
  }
  scaleValue = scale.get_units(5);
  scaleValue = absValue(scaleValue);

  //Update Display
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.printf("Wt:%2d g", (int)scaleValue);
  display.setTextSize(1);
  display.printf("\n\nFull: %2d g", (int)fullWeight);
  if(locked){
    display.printf("\n\n\nLocked at %2d g", (int)lockWeight);
  }
  display.display();
  delay(1000);
  //Checks for the weight of the bag of dog food
  if(scaleValue > 1000){
    Particle.publish("scaleValue2","good",PRIVATE);
    //publish tag value for troubleshooting
    Particle.publish("flag", String(flag), PRIVATE);
  }
  //publish the buy food command if the flag is true
  if(flag==true){
     Particle.publish("Buy Food",String(scaleValue)+"g");
  }
  
  //Serial.print(scaleValue);Serial.println("g");

  scale.power_down();
  //delay(43200000);
  int startTime = millis();
  while(true){
    if(millis()-startTime >= 43200000){
      break;
    }
  }
 
}



int tareScale(String command){
  scale.tare();
  delay(100);
  Serial.println("Scale Teared From Cloud!!");
  return 1;
}

int setFullWeight(String command){
  fullWeight = scaleValue;
  return fullWeight;
}

int lockScale(String command){
  locked = !locked;
  lockWeight = scaleValue;

  if(locked){
    lockedInt = 1;
    return lockWeight;
  }else{
    lockedInt = 0;
    return -1;
  }
}

//Not really working right now
double absValue(double value){
  double newValue = 0;
  if(value < 0){
    newValue = -1*value;
    return newValue;
  }
  return value;
}

Adafruit_SSD1306.cpp

C/C++
Library File
/*********************************************************************
This is a library for our Monochrome OLEDs based on SSD1306 drivers
  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98
These displays use SPI to communicate, 4 or 5 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada  for Adafruit Industries.
BSD license, check license.txt for more information
All text above, and the splash screen below must be included in any redistribution
*********************************************************************/

#include "Adafruit_GFX.h"
#include "Adafruit_SSD1306.h"

// the memory buffer for the LCD

static uint8_t buffer[SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x80, 0x80, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xF8, 0xE0, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80,
0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x00, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00,
0x80, 0xFF, 0xFF, 0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x80, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x8C, 0x8E, 0x84, 0x00, 0x00, 0x80, 0xF8,
0xF8, 0xF8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xE0, 0xE0, 0xC0, 0x80,
0x00, 0xE0, 0xFC, 0xFE, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0xC7, 0x01, 0x01,
0x01, 0x01, 0x83, 0xFF, 0xFF, 0x00, 0x00, 0x7C, 0xFE, 0xC7, 0x01, 0x01, 0x01, 0x01, 0x83, 0xFF,
0xFF, 0xFF, 0x00, 0x38, 0xFE, 0xC7, 0x83, 0x01, 0x01, 0x01, 0x83, 0xC7, 0xFF, 0xFF, 0x00, 0x00,
0x01, 0xFF, 0xFF, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x07, 0x01, 0x01, 0x01, 0x00, 0x00, 0x7F, 0xFF,
0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x7F, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x01, 0xFF,
0xFF, 0xFF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0x0F, 0x3F, 0x7F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xC7, 0xC7, 0x8F,
0x8F, 0x9F, 0xBF, 0xFF, 0xFF, 0xC3, 0xC0, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xFC, 0xFC,
0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xF8, 0xF8, 0xF0, 0xF0, 0xE0, 0xC0, 0x00, 0x01, 0x03, 0x03, 0x03,
0x03, 0x03, 0x01, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01,
0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01, 0x03, 0x03, 0x00, 0x00,
0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x03, 0x03, 0x03, 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x01, 0x00, 0x00, 0x00, 0x03,
0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
#if (SSD1306_LCDHEIGHT == 64)
0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F, 0x1F, 0x0F,
0x87, 0xC7, 0xF7, 0xFF, 0xFF, 0x1F, 0x1F, 0x3D, 0xFC, 0xF8, 0xF8, 0xF8, 0xF8, 0x7C, 0x7D, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x3F, 0x0F, 0x07, 0x00, 0x30, 0x30, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x7F, 0x3F, 0x1F,
0x0F, 0x07, 0x1F, 0x7F, 0xFF, 0xFF, 0xF8, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xF8, 0xE0,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00,
0x00, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x0E, 0xFC, 0xF8, 0x00, 0x00, 0xF0, 0xF8, 0x1C, 0x0E,
0x06, 0x06, 0x06, 0x0C, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0xFC,
0xFE, 0xFC, 0x00, 0x18, 0x3C, 0x7E, 0x66, 0xE6, 0xCE, 0x84, 0x00, 0x00, 0x06, 0xFF, 0xFF, 0x06,
0x06, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x06, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0xC0, 0xF8,
0xFC, 0x4E, 0x46, 0x46, 0x46, 0x4E, 0x7C, 0x78, 0x40, 0x18, 0x3C, 0x76, 0xE6, 0xCE, 0xCC, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x07, 0x0F, 0x1F, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x1F, 0x0F, 0x03,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x03, 0x07, 0x0E, 0x0C,
0x18, 0x18, 0x0C, 0x06, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x01, 0x0F, 0x0E, 0x0C, 0x18, 0x0C, 0x0F,
0x07, 0x01, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00,
0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x07,
0x07, 0x0C, 0x0C, 0x18, 0x1C, 0x0C, 0x06, 0x06, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
#endif
};



// the most basic function, set a single pixel
void Adafruit_SSD1306::drawPixel(int16_t x, int16_t y, uint16_t color) {
  if ((x < 0) || (x >= width()) || (y < 0) || (y >= height()))
    return;

  // check rotation, move pixel around if necessary
  switch (getRotation()) {
  case 1:
    swap(x, y);
    x = WIDTH - x - 1;
    break;
  case 2:
    x = WIDTH - x - 1;
    y = HEIGHT - y - 1;
    break;
  case 3:
    swap(x, y);
    y = HEIGHT - y - 1;
    break;
  }

  // x is which column
  if (color == WHITE)
    buffer[x+ (y/8)*SSD1306_LCDWIDTH] |= (1 << (y&7));
  else
    buffer[x+ (y/8)*SSD1306_LCDWIDTH] &= ~(1 << (y&7));
}

// constructor for software SPI - we indicate DataCommand, ChipSelect, Reset
Adafruit_SSD1306::Adafruit_SSD1306(int8_t SID, int8_t SCLK, int8_t DC, int8_t RST, int8_t CS) : Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
  cs = CS;
  rst = RST;
  dc = DC;
  sclk = SCLK;
  sid = SID;
  hwSPI = false;
}

// constructor for hardware SPI - we indicate DataCommand, ChipSelect, Reset
Adafruit_SSD1306::Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS) : Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
  dc = DC;
  rst = RST;
  cs = CS;
  hwSPI = true;
}

// initializer for I2C - we only indicate the reset pin!
Adafruit_SSD1306::Adafruit_SSD1306(int8_t reset) :
Adafruit_GFX(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT) {
  sclk = dc = cs = sid = -1;
  rst = reset;
}


void Adafruit_SSD1306::begin(uint8_t vccstate, uint8_t i2caddr) {
  _vccstate = vccstate;
  _i2caddr = i2caddr;

  // set pin directions
  if (sid != -1){
    pinMode(dc, OUTPUT);
    pinMode(cs, OUTPUT);
    if (!hwSPI){
    	// set pins for software-SPI
    	pinMode(sid, OUTPUT);
    	pinMode(sclk, OUTPUT);
    	}
    if (hwSPI){
        digitalWrite(cs, HIGH);
        SPI.setBitOrder(MSBFIRST);
        SPI.setClockDivider(SPI_CLOCK_DIV8);	// 72MHz / 8 = 9Mhz
        SPI.setDataMode(0);
        SPI.begin();
    	}
    }
  else
  {
    // I2C Init
    Wire.begin();
  }

  // Setup reset pin direction (used by both SPI and I2C)
  pinMode(rst, OUTPUT);
  digitalWrite(rst, HIGH);
  // VDD (3.3V) goes high at start, lets just chill for a ms
  delay(1);
  // bring reset low
  digitalWrite(rst, LOW);
  // wait 10ms
  delay(10);
  // bring out of reset
  digitalWrite(rst, HIGH);
  // turn on VCC (9V?)

   #if defined SSD1306_128_32
    // Init sequence for 128x32 OLED module
    ssd1306_command(SSD1306_DISPLAYOFF);                    // 0xAE
    ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV);            // 0xD5
    ssd1306_command(0x80);                                  // the suggested ratio 0x80
    ssd1306_command(SSD1306_SETMULTIPLEX);                  // 0xA8
    ssd1306_command(0x1F);
    ssd1306_command(SSD1306_SETDISPLAYOFFSET);              // 0xD3
    ssd1306_command(0x0);                                   // no offset
    ssd1306_command(SSD1306_SETSTARTLINE | 0x0);            // line #0
    ssd1306_command(SSD1306_CHARGEPUMP);                    // 0x8D
    if (vccstate == SSD1306_EXTERNALVCC)
      { ssd1306_command(0x10); }
    else
      { ssd1306_command(0x14); }
    ssd1306_command(SSD1306_MEMORYMODE);                    // 0x20
    ssd1306_command(0x00);                                  // 0x0 act like ks0108
	ssd1306_command(SSD1306_SEGREMAP | 0x1);
    ssd1306_command(SSD1306_COMSCANDEC);
    ssd1306_command(SSD1306_SETCOMPINS);                    // 0xDA
    ssd1306_command(0x02);
    ssd1306_command(SSD1306_SETCONTRAST);                   // 0x81
    ssd1306_command(0x8F);
    ssd1306_command(SSD1306_SETPRECHARGE);                  // 0xd9
    if (vccstate == SSD1306_EXTERNALVCC)
      { ssd1306_command(0x22); }
    else
      { ssd1306_command(0xF1); }
    ssd1306_command(SSD1306_SETVCOMDETECT);                 // 0xDB
    ssd1306_command(0x40);
    ssd1306_command(SSD1306_DISPLAYALLON_RESUME);           // 0xA4
    ssd1306_command(SSD1306_NORMALDISPLAY);                 // 0xA6
  #endif

  #if defined SSD1306_128_64
    // Init sequence for 128x64 OLED module
    ssd1306_command(SSD1306_DISPLAYOFF);                    // 0xAE
    ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV);            // 0xD5
    ssd1306_command(0x80);                                  // the suggested ratio 0x80
    ssd1306_command(SSD1306_SETMULTIPLEX);                  // 0xA8
    ssd1306_command(0x3F);
    ssd1306_command(SSD1306_SETDISPLAYOFFSET);              // 0xD3
    ssd1306_command(0x0);                                   // no offset
    ssd1306_command(SSD1306_SETSTARTLINE | 0x0);            // line #0
    ssd1306_command(SSD1306_CHARGEPUMP);                    // 0x8D
    if (vccstate == SSD1306_EXTERNALVCC)
      { ssd1306_command(0x10); }
    else
      { ssd1306_command(0x14); }
    ssd1306_command(SSD1306_MEMORYMODE);                    // 0x20
    ssd1306_command(0x00);                                  // 0x0 act like ks0108
    ssd1306_command(SSD1306_SEGREMAP | 0x1);
    ssd1306_command(SSD1306_COMSCANDEC);
    ssd1306_command(SSD1306_SETCOMPINS);                    // 0xDA
    ssd1306_command(0x12);
    ssd1306_command(SSD1306_SETCONTRAST);                   // 0x81
    if (vccstate == SSD1306_EXTERNALVCC)
      { ssd1306_command(0x9F); }
    else
      { ssd1306_command(0xCF); }
    ssd1306_command(SSD1306_SETPRECHARGE);                  // 0xd9
    if (vccstate == SSD1306_EXTERNALVCC)
      { ssd1306_command(0x22); }
    else
      { ssd1306_command(0xF1); }
    ssd1306_command(SSD1306_SETVCOMDETECT);                 // 0xDB
    ssd1306_command(0x40);
    ssd1306_command(SSD1306_DISPLAYALLON_RESUME);           // 0xA4
    ssd1306_command(SSD1306_NORMALDISPLAY);                 // 0xA6
  #endif

  ssd1306_command(SSD1306_DISPLAYON);//--turn on oled panel
}


void Adafruit_SSD1306::invertDisplay(uint8_t i) {
  if (i) {
    ssd1306_command(SSD1306_INVERTDISPLAY);
  } else {
    ssd1306_command(SSD1306_NORMALDISPLAY);
  }
}

void Adafruit_SSD1306::ssd1306_command(uint8_t c) {
  if (sid != -1)
  {
    // SPI
    digitalWrite(cs, HIGH);
    digitalWrite(dc, LOW);
    digitalWrite(cs, LOW);
    fastSPIwrite(c);
    digitalWrite(cs, HIGH);
  }
  else
  {
    // I2C
    uint8_t control = 0x00;   // Co = 0, D/C = 0
    Wire.beginTransmission(_i2caddr);
    Wire.write(control);
    Wire.write(c);
    Wire.endTransmission();
  }
}

// startscrollright
// Activate a right handed scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void Adafruit_SSD1306::startscrollright(uint8_t start, uint8_t stop){
	ssd1306_command(SSD1306_RIGHT_HORIZONTAL_SCROLL);
	ssd1306_command(0X00);
	ssd1306_command(start);
	ssd1306_command(0X00);
	ssd1306_command(stop);
	ssd1306_command(0X00);
	ssd1306_command(0XFF);
	ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}

// startscrollleft
// Activate a right handed scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void Adafruit_SSD1306::startscrollleft(uint8_t start, uint8_t stop){
	ssd1306_command(SSD1306_LEFT_HORIZONTAL_SCROLL);
	ssd1306_command(0X00);
	ssd1306_command(start);
	ssd1306_command(0X00);
	ssd1306_command(stop);
	ssd1306_command(0X00);
	ssd1306_command(0XFF);
	ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}

// startscrolldiagright
// Activate a diagonal scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void Adafruit_SSD1306::startscrolldiagright(uint8_t start, uint8_t stop){
	ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA);
	ssd1306_command(0X00);
	ssd1306_command(SSD1306_LCDHEIGHT);
	ssd1306_command(SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL);
	ssd1306_command(0X00);
	ssd1306_command(start);
	ssd1306_command(0X00);
	ssd1306_command(stop);
	ssd1306_command(0X01);
	ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}

// startscrolldiagleft
// Activate a diagonal scroll for rows start through stop
// Hint, the display is 16 rows tall. To scroll the whole display, run:
// display.scrollright(0x00, 0x0F)
void Adafruit_SSD1306::startscrolldiagleft(uint8_t start, uint8_t stop){
	ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA);
	ssd1306_command(0X00);
	ssd1306_command(SSD1306_LCDHEIGHT);
	ssd1306_command(SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL);
	ssd1306_command(0X00);
	ssd1306_command(start);
	ssd1306_command(0X00);
	ssd1306_command(stop);
	ssd1306_command(0X01);
	ssd1306_command(SSD1306_ACTIVATE_SCROLL);
}

void Adafruit_SSD1306::stopscroll(void){
	ssd1306_command(SSD1306_DEACTIVATE_SCROLL);
}

// Dim the display
// dim = true: display is dimmed
// dim = false: display is normal
void Adafruit_SSD1306::dim(bool dim) {
  uint8_t contrast;

  if (dim) {
    contrast = 0; // Dimmed display
  } else {
    if (_vccstate == SSD1306_EXTERNALVCC) {
      contrast = 0x9F;
    } else {
      contrast = 0xCF;
    }
  }
  // the range of contrast to too small to be really useful
  // it is useful to dim the display
  ssd1306_command(SSD1306_SETCONTRAST);
  ssd1306_command(contrast);
}

void Adafruit_SSD1306::ssd1306_data(uint8_t c) {
  if (sid != -1)
  {
    // SPI
    digitalWrite(cs, HIGH);
    digitalWrite(dc, HIGH);
    digitalWrite(cs, LOW);
    fastSPIwrite(c);
    digitalWrite(cs, HIGH);
  }
  else
  {
    // I2C
    uint8_t control = 0x40;   // Co = 0, D/C = 1
    Wire.beginTransmission(_i2caddr);
    Wire.write(control);
    Wire.write(c);
    Wire.endTransmission();
  }
}

void Adafruit_SSD1306::display(void) {
  ssd1306_command(SSD1306_COLUMNADDR);
  ssd1306_command(0);   // Column start address (0 = reset)
  ssd1306_command(127); // Column end address (127 = reset)

  ssd1306_command(SSD1306_PAGEADDR);
  ssd1306_command(0); // Page start address (0 = reset)
  ssd1306_command((SSD1306_LCDHEIGHT == 64) ? 7 : 3); // Page end address

  if (sid != -1)
  {
    // SPI
    digitalWrite(cs, HIGH);
    digitalWrite(dc, HIGH);
    digitalWrite(cs, LOW);
	delayMicroseconds(1);		// May not be necessary - needs testing

    for (uint16_t i=0; i<(SSD1306_LCDWIDTH*SSD1306_LCDHEIGHT/8); i++) {
      fastSPIwrite(buffer[i]);
      //ssd1306_data(buffer[i]);
    }
	delayMicroseconds(1);		// May not be necessary - needs testing
    digitalWrite(cs, HIGH);
  }
  else
  {
    // I2C
    for (uint16_t i=0; i<(SSD1306_LCDWIDTH*SSD1306_LCDHEIGHT/8); i++) {
      // send a bunch of data in one xmission
      Wire.beginTransmission(_i2caddr);
      Wire.write(0x40);
      for (uint8_t x=0; x<16; x++) {
		Wire.write(buffer[i]);
		i++;
		}
	i--;
	Wire.endTransmission();
	}
  }
}

// clear everything
void Adafruit_SSD1306::clearDisplay(void) {
  memset(buffer, 0, (SSD1306_LCDWIDTH*SSD1306_LCDHEIGHT/8));
}


inline void Adafruit_SSD1306::fastSPIwrite(uint8_t d) {

  if(hwSPI) {
    (void)SPI.transfer(d);
  } else {
    shiftOut(sid, sclk, MSBFIRST, d);		// SSD1306 specs show MSB out first
  }
}

void Adafruit_SSD1306::drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color) {
  boolean bSwap = false;
  switch(rotation) {
    case 0:
      // 0 degree rotation, do nothing
      break;
    case 1:
      // 90 degree rotation, swap x & y for rotation, then invert x
      bSwap = true;
      swap(x, y);
      x = WIDTH - x - 1;
      break;
    case 2:
      // 180 degree rotation, invert x and y - then shift y around for height.
      x = WIDTH - x - 1;
      y = HEIGHT - y - 1;
      x -= (w-1);
      break;
    case 3:
      // 270 degree rotation, swap x & y for rotation, then invert y  and adjust y for w (not to become h)
      bSwap = true;
      swap(x, y);
      y = HEIGHT - y - 1;
      y -= (w-1);
      break;
  }

  if(bSwap) {
    drawFastVLineInternal(x, y, w, color);
  } else {
    drawFastHLineInternal(x, y, w, color);
  }
}

void Adafruit_SSD1306::drawFastHLineInternal(int16_t x, int16_t y, int16_t w, uint16_t color) {
  // Do bounds/limit checks
  if(y < 0 || y >= HEIGHT) { return; }

  // make sure we don't try to draw below 0
  if(x < 0) {
    w += x;
    x = 0;
  }

  // make sure we don't go off the edge of the display
  if( (x + w) > WIDTH) {
    w = (HEIGHT- x);
  }

  // if our width is now negative, punt
  if(w <= 0) { return; }

  // set up the pointer for  movement through the buffer
  register uint8_t *pBuf = buffer;
  // adjust the buffer pointer for the current row
  pBuf += ((y/8) * SSD1306_LCDWIDTH);
  // and offset x columns in
  pBuf += x;

  register uint8_t mask = 1 << (y&7);

  if(color == WHITE) {
    while(w--) { *pBuf++ |= mask; }
  } else {
    mask = ~mask;
    while(w--) { *pBuf++ &= mask; }
  }
}

void Adafruit_SSD1306::drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color) {
  bool bSwap = false;
  switch(rotation) {
    case 0:
      break;
    case 1:
      // 90 degree rotation, swap x & y for rotation, then invert x and adjust x for h (now to become w)
      bSwap = true;
      swap(x, y);
      x = WIDTH - x - 1;
      x -= (h-1);
      break;
    case 2:
      // 180 degree rotation, invert x and y - then shift y around for height.
      x = WIDTH - x - 1;
      y = HEIGHT - y - 1;
      y -= (h-1);
      break;
    case 3:
      // 270 degree rotation, swap x & y for rotation, then invert y
      bSwap = true;
      swap(x, y);
      y = HEIGHT - y - 1;
      break;
  }

  if(bSwap) {
    drawFastHLineInternal(x, y, h, color);
  } else {
    drawFastVLineInternal(x, y, h, color);
  }
}


void Adafruit_SSD1306::drawFastVLineInternal(int16_t x, int16_t __y, int16_t __h, uint16_t color) {

  // do nothing if we're off the left or right side of the screen
  if(x < 0 || x >= WIDTH) { return; }

  // make sure we don't try to draw below 0
  if(__y < 0) {
    // __y is negative, this will subtract enough from __h to account for __y being 0
    __h += __y;
    __y = 0;

  }

  // make sure we don't go past the height of the display
  if( (__y + __h) > HEIGHT) {
    __h = (HEIGHT - __y);
  }

  // if our height is now negative, punt
  if(__h <= 0) {
    return;
  }

  // this display doesn't need ints for coordinates, use local byte registers for faster juggling
  register uint8_t y = __y;
  register uint8_t h = __h;


  // set up the pointer for fast movement through the buffer
  register uint8_t *pBuf = buffer;
  // adjust the buffer pointer for the current row
  pBuf += ((y/8) * SSD1306_LCDWIDTH);
  // and offset x columns in
  pBuf += x;

  // do the first partial byte, if necessary - this requires some masking
  register uint8_t mod = (y&7);
  if(mod) {
    // mask off the high n bits we want to set
    mod = 8-mod;

    // note - lookup table results in a nearly 10% performance improvement in fill* functions
    // register uint8_t mask = ~(0xFF >> (mod));
    static uint8_t premask[8] = {0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };
    register uint8_t mask = premask[mod];

    // adjust the mask if we're not going to reach the end of this byte
    if( h < mod) {
      mask &= (0XFF >> (mod-h));
    }

    if(color == WHITE) {
      *pBuf |= mask;
    } else {
      *pBuf &= ~mask;
    }

    // fast exit if we're done here!
    if(h<mod) { return; }

    h -= mod;

    pBuf += SSD1306_LCDWIDTH;
  }


  // write solid bytes while we can - effectively doing 8 rows at a time
  if(h >= 8) {
    // store a local value to work with
    register uint8_t val = (color == WHITE) ? 255 : 0;

    do  {
      // write our value in
      *pBuf = val;

      // adjust the buffer forward 8 rows worth of data
      pBuf += SSD1306_LCDWIDTH;

      // adjust h & y (there's got to be a faster way for me to do this, but this should still help a fair bit for now)
      h -= 8;
    } while(h >= 8);
  }

  // now do the final partial byte, if necessary
  if(h) {
    mod = h & 7;
    // this time we want to mask the low bits of the byte, vs the high bits we did above
    // register uint8_t mask = (1 << mod) - 1;
    // note - lookup table results in a nearly 10% performance improvement in fill* functions
    static uint8_t postmask[8] = {0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F };
    register uint8_t mask = postmask[mod];
    if(color == WHITE) {
      *pBuf |= mask;
    } else {
      *pBuf &= ~mask;
    }
  }
}

Adafruit_GFX.h

C/C++
Library File
#ifndef _ADAFRUIT_GFX_H
#define _ADAFRUIT_GFX_H

#include "application.h"


#define swap(a, b) { int16_t t = a; a = b; b = t; }

class Adafruit_GFX : public Print {

 public:

  Adafruit_GFX(int16_t w, int16_t h); // Constructor

  // This MUST be defined by the subclass:
  virtual void drawPixel(int16_t x, int16_t y, uint16_t color) = 0;

  // These MAY be overridden by the subclass to provide device-specific
  // optimized code.  Otherwise 'generic' versions are used.
  virtual void
    drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color),
    drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color),
    drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color),
    drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color),
    fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color),
    fillScreen(uint16_t color),
    invertDisplay(boolean i);

  // These exist only with Adafruit_GFX (no subclass overrides)
  void
    drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color),
    drawCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername,
      uint16_t color),
    fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color),
    fillCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername,
      int16_t delta, uint16_t color),
    drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
      int16_t x2, int16_t y2, uint16_t color),
    fillTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
      int16_t x2, int16_t y2, uint16_t color),
    drawRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h,
      int16_t radius, uint16_t color),
    fillRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h,
      int16_t radius, uint16_t color),
    drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap,
      int16_t w, int16_t h, uint16_t color),
    drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color,
      uint16_t bg, uint8_t size),
    setCursor(int16_t x, int16_t y),
    setTextColor(uint16_t c),
    setTextColor(uint16_t c, uint16_t bg),
    setTextSize(uint8_t s),
    setTextWrap(boolean w),
    setRotation(uint8_t r);

   virtual size_t write(uint8_t);

  int16_t
    height(void),
    width(void);

  uint8_t getRotation(void);

 protected:
  const int16_t
    WIDTH, HEIGHT;   // This is the 'raw' display w/h - never changes
  int16_t
    _width, _height, // Display w/h as modified by current rotation
    cursor_x, cursor_y;
  uint16_t
    textcolor, textbgcolor;
  uint8_t
    textsize,
    rotation;
  boolean
    wrap; // If set, 'wrap' text at right edge of display
};

#endif // _ADAFRUIT_GFX_H

Adafruit_GFX.cpp

C/C++
Library File
/*
This is the core graphics library for all our displays, providing a common
set of graphics primitives (points, lines, circles, etc.).  It needs to be
paired with a hardware-specific library for each display device we carry
(to handle the lower-level functions).
Adafruit invests time and resources providing this open source code, please
support Adafruit & open-source hardware by purchasing products from Adafruit!
Copyright (c) 2013 Adafruit Industries.  All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/

#include "Adafruit_GFX.h"

#define pgm_read_byte(addr) (*(const unsigned char *)(addr))


static const unsigned char font[] = {
    0x00, 0x00, 0x00, 0x00, 0x00,
	0x3E, 0x5B, 0x4F, 0x5B, 0x3E,
	0x3E, 0x6B, 0x4F, 0x6B, 0x3E,
	0x1C, 0x3E, 0x7C, 0x3E, 0x1C,
	0x18, 0x3C, 0x7E, 0x3C, 0x18,
	0x1C, 0x57, 0x7D, 0x57, 0x1C,
	0x1C, 0x5E, 0x7F, 0x5E, 0x1C,
	0x00, 0x18, 0x3C, 0x18, 0x00,
	0xFF, 0xE7, 0xC3, 0xE7, 0xFF,
	0x00, 0x18, 0x24, 0x18, 0x00,
	0xFF, 0xE7, 0xDB, 0xE7, 0xFF,
	0x30, 0x48, 0x3A, 0x06, 0x0E,
	0x26, 0x29, 0x79, 0x29, 0x26,
	0x40, 0x7F, 0x05, 0x05, 0x07,
	0x40, 0x7F, 0x05, 0x25, 0x3F,
	0x5A, 0x3C, 0xE7, 0x3C, 0x5A,
	0x7F, 0x3E, 0x1C, 0x1C, 0x08,
	0x08, 0x1C, 0x1C, 0x3E, 0x7F,
	0x14, 0x22, 0x7F, 0x22, 0x14,
	0x5F, 0x5F, 0x00, 0x5F, 0x5F,
	0x06, 0x09, 0x7F, 0x01, 0x7F,
	0x00, 0x66, 0x89, 0x95, 0x6A,
	0x60, 0x60, 0x60, 0x60, 0x60,
	0x94, 0xA2, 0xFF, 0xA2, 0x94,
	0x08, 0x04, 0x7E, 0x04, 0x08,
	0x10, 0x20, 0x7E, 0x20, 0x10,
	0x08, 0x08, 0x2A, 0x1C, 0x08,
	0x08, 0x1C, 0x2A, 0x08, 0x08,
	0x1E, 0x10, 0x10, 0x10, 0x10,
	0x0C, 0x1E, 0x0C, 0x1E, 0x0C,
	0x30, 0x38, 0x3E, 0x38, 0x30,
	0x06, 0x0E, 0x3E, 0x0E, 0x06,
	0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x5F, 0x00, 0x00,
	0x00, 0x07, 0x00, 0x07, 0x00,
	0x14, 0x7F, 0x14, 0x7F, 0x14,
	0x24, 0x2A, 0x7F, 0x2A, 0x12,
	0x23, 0x13, 0x08, 0x64, 0x62,
	0x36, 0x49, 0x56, 0x20, 0x50,
	0x00, 0x08, 0x07, 0x03, 0x00,
	0x00, 0x1C, 0x22, 0x41, 0x00,
	0x00, 0x41, 0x22, 0x1C, 0x00,
	0x2A, 0x1C, 0x7F, 0x1C, 0x2A,
	0x08, 0x08, 0x3E, 0x08, 0x08,
	0x00, 0x80, 0x70, 0x30, 0x00,
	0x08, 0x08, 0x08, 0x08, 0x08,
	0x00, 0x00, 0x60, 0x60, 0x00,
	0x20, 0x10, 0x08, 0x04, 0x02,
	0x3E, 0x51, 0x49, 0x45, 0x3E,
	0x00, 0x42, 0x7F, 0x40, 0x00,
	0x72, 0x49, 0x49, 0x49, 0x46,
	0x21, 0x41, 0x49, 0x4D, 0x33,
	0x18, 0x14, 0x12, 0x7F, 0x10,
	0x27, 0x45, 0x45, 0x45, 0x39,
	0x3C, 0x4A, 0x49, 0x49, 0x31,
	0x41, 0x21, 0x11, 0x09, 0x07,
	0x36, 0x49, 0x49, 0x49, 0x36,
	0x46, 0x49, 0x49, 0x29, 0x1E,
	0x00, 0x00, 0x14, 0x00, 0x00,
	0x00, 0x40, 0x34, 0x00, 0x00,
	0x00, 0x08, 0x14, 0x22, 0x41,
	0x14, 0x14, 0x14, 0x14, 0x14,
	0x00, 0x41, 0x22, 0x14, 0x08,
	0x02, 0x01, 0x59, 0x09, 0x06,
	0x3E, 0x41, 0x5D, 0x59, 0x4E,
	0x7C, 0x12, 0x11, 0x12, 0x7C,
	0x7F, 0x49, 0x49, 0x49, 0x36,
	0x3E, 0x41, 0x41, 0x41, 0x22,
	0x7F, 0x41, 0x41, 0x41, 0x3E,
	0x7F, 0x49, 0x49, 0x49, 0x41,
	0x7F, 0x09, 0x09, 0x09, 0x01,
	0x3E, 0x41, 0x41, 0x51, 0x73,
	0x7F, 0x08, 0x08, 0x08, 0x7F,
	0x00, 0x41, 0x7F, 0x41, 0x00,
	0x20, 0x40, 0x41, 0x3F, 0x01,
	0x7F, 0x08, 0x14, 0x22, 0x41,
	0x7F, 0x40, 0x40, 0x40, 0x40,
	0x7F, 0x02, 0x1C, 0x02, 0x7F,
	0x7F, 0x04, 0x08, 0x10, 0x7F,
	0x3E, 0x41, 0x41, 0x41, 0x3E,
	0x7F, 0x09, 0x09, 0x09, 0x06,
	0x3E, 0x41, 0x51, 0x21, 0x5E,
	0x7F, 0x09, 0x19, 0x29, 0x46,
	0x26, 0x49, 0x49, 0x49, 0x32,
	0x03, 0x01, 0x7F, 0x01, 0x03,
	0x3F, 0x40, 0x40, 0x40, 0x3F,
	0x1F, 0x20, 0x40, 0x20, 0x1F,
	0x3F, 0x40, 0x38, 0x40, 0x3F,
	0x63, 0x14, 0x08, 0x14, 0x63,
	0x03, 0x04, 0x78, 0x04, 0x03,
	0x61, 0x59, 0x49, 0x4D, 0x43,
	0x00, 0x7F, 0x41, 0x41, 0x41,
	0x02, 0x04, 0x08, 0x10, 0x20,
	0x00, 0x41, 0x41, 0x41, 0x7F,
	0x04, 0x02, 0x01, 0x02, 0x04,
	0x40, 0x40, 0x40, 0x40, 0x40,
	0x00, 0x03, 0x07, 0x08, 0x00,
	0x20, 0x54, 0x54, 0x78, 0x40,
	0x7F, 0x28, 0x44, 0x44, 0x38,
	0x38, 0x44, 0x44, 0x44, 0x28,
	0x38, 0x44, 0x44, 0x28, 0x7F,
	0x38, 0x54, 0x54, 0x54, 0x18,
	0x00, 0x08, 0x7E, 0x09, 0x02,
	0x18, 0xA4, 0xA4, 0x9C, 0x78,
	0x7F, 0x08, 0x04, 0x04, 0x78,
	0x00, 0x44, 0x7D, 0x40, 0x00,
	0x20, 0x40, 0x40, 0x3D, 0x00,
	0x7F, 0x10, 0x28, 0x44, 0x00,
	0x00, 0x41, 0x7F, 0x40, 0x00,
	0x7C, 0x04, 0x78, 0x04, 0x78,
	0x7C, 0x08, 0x04, 0x04, 0x78,
	0x38, 0x44, 0x44, 0x44, 0x38,
	0xFC, 0x18, 0x24, 0x24, 0x18,
	0x18, 0x24, 0x24, 0x18, 0xFC,
	0x7C, 0x08, 0x04, 0x04, 0x08,
	0x48, 0x54, 0x54, 0x54, 0x24,
	0x04, 0x04, 0x3F, 0x44, 0x24,
	0x3C, 0x40, 0x40, 0x20, 0x7C,
	0x1C, 0x20, 0x40, 0x20, 0x1C,
	0x3C, 0x40, 0x30, 0x40, 0x3C,
	0x44, 0x28, 0x10, 0x28, 0x44,
	0x4C, 0x90, 0x90, 0x90, 0x7C,
	0x44, 0x64, 0x54, 0x4C, 0x44,
	0x00, 0x08, 0x36, 0x41, 0x00,
	0x00, 0x00, 0x77, 0x00, 0x00,
	0x00, 0x41, 0x36, 0x08, 0x00,
	0x02, 0x01, 0x02, 0x04, 0x02,
	0x3C, 0x26, 0x23, 0x26, 0x3C,
	0x1E, 0xA1, 0xA1, 0x61, 0x12,
	0x3A, 0x40, 0x40, 0x20, 0x7A,
	0x38, 0x54, 0x54, 0x55, 0x59,
	0x21, 0x55, 0x55, 0x79, 0x41,
	0x21, 0x54, 0x54, 0x78, 0x41,
	0x21, 0x55, 0x54, 0x78, 0x40,
	0x20, 0x54, 0x55, 0x79, 0x40,
	0x0C, 0x1E, 0x52, 0x72, 0x12,
	0x39, 0x55, 0x55, 0x55, 0x59,
	0x39, 0x54, 0x54, 0x54, 0x59,
	0x39, 0x55, 0x54, 0x54, 0x58,
	0x00, 0x00, 0x45, 0x7C, 0x41,
	0x00, 0x02, 0x45, 0x7D, 0x42,
	0x00, 0x01, 0x45, 0x7C, 0x40,
	0xF0, 0x29, 0x24, 0x29, 0xF0,
	0xF0, 0x28, 0x25, 0x28, 0xF0,
	0x7C, 0x54, 0x55, 0x45, 0x00,
	0x20, 0x54, 0x54, 0x7C, 0x54,
	0x7C, 0x0A, 0x09, 0x7F, 0x49,
	0x32, 0x49, 0x49, 0x49, 0x32,
	0x32, 0x48, 0x48, 0x48, 0x32,
	0x32, 0x4A, 0x48, 0x48, 0x30,
	0x3A, 0x41, 0x41, 0x21, 0x7A,
	0x3A, 0x42, 0x40, 0x20, 0x78,
	0x00, 0x9D, 0xA0, 0xA0, 0x7D,
	0x39, 0x44, 0x44, 0x44, 0x39,
	0x3D, 0x40, 0x40, 0x40, 0x3D,
	0x3C, 0x24, 0xFF, 0x24, 0x24,
	0x48, 0x7E, 0x49, 0x43, 0x66,
	0x2B, 0x2F, 0xFC, 0x2F, 0x2B,
	0xFF, 0x09, 0x29, 0xF6, 0x20,
	0xC0, 0x88, 0x7E, 0x09, 0x03,
	0x20, 0x54, 0x54, 0x79, 0x41,
	0x00, 0x00, 0x44, 0x7D, 0x41,
	0x30, 0x48, 0x48, 0x4A, 0x32,
	0x38, 0x40, 0x40, 0x22, 0x7A,
	0x00, 0x7A, 0x0A, 0x0A, 0x72,
	0x7D, 0x0D, 0x19, 0x31, 0x7D,
	0x26, 0x29, 0x29, 0x2F, 0x28,
	0x26, 0x29, 0x29, 0x29, 0x26,
	0x30, 0x48, 0x4D, 0x40, 0x20,
	0x38, 0x08, 0x08, 0x08, 0x08,
	0x08, 0x08, 0x08, 0x08, 0x38,
	0x2F, 0x10, 0xC8, 0xAC, 0xBA,
	0x2F, 0x10, 0x28, 0x34, 0xFA,
	0x00, 0x00, 0x7B, 0x00, 0x00,
	0x08, 0x14, 0x2A, 0x14, 0x22,
	0x22, 0x14, 0x2A, 0x14, 0x08,
	0xAA, 0x00, 0x55, 0x00, 0xAA,
	0xAA, 0x55, 0xAA, 0x55, 0xAA,
	0x00, 0x00, 0x00, 0xFF, 0x00,
	0x10, 0x10, 0x10, 0xFF, 0x00,
	0x14, 0x14, 0x14, 0xFF, 0x00,
	0x10, 0x10, 0xFF, 0x00, 0xFF,
	0x10, 0x10, 0xF0, 0x10, 0xF0,
	0x14, 0x14, 0x14, 0xFC, 0x00,
	0x14, 0x14, 0xF7, 0x00, 0xFF,
	0x00, 0x00, 0xFF, 0x00, 0xFF,
	0x14, 0x14, 0xF4, 0x04, 0xFC,
	0x14, 0x14, 0x17, 0x10, 0x1F,
	0x10, 0x10, 0x1F, 0x10, 0x1F,
	0x14, 0x14, 0x14, 0x1F, 0x00,
	0x10, 0x10, 0x10, 0xF0, 0x00,
	0x00, 0x00, 0x00, 0x1F, 0x10,
	0x10, 0x10, 0x10, 0x1F, 0x10,
	0x10, 0x10, 0x10, 0xF0, 0x10,
	0x00, 0x00, 0x00, 0xFF, 0x10,
	0x10, 0x10, 0x10, 0x10, 0x10,
	0x10, 0x10, 0x10, 0xFF, 0x10,
	0x00, 0x00, 0x00, 0xFF, 0x14,
	0x00, 0x00, 0xFF, 0x00, 0xFF,
	0x00, 0x00, 0x1F, 0x10, 0x17,
	0x00, 0x00, 0xFC, 0x04, 0xF4,
	0x14, 0x14, 0x17, 0x10, 0x17,
	0x14, 0x14, 0xF4, 0x04, 0xF4,
	0x00, 0x00, 0xFF, 0x00, 0xF7,
	0x14, 0x14, 0x14, 0x14, 0x14,
	0x14, 0x14, 0xF7, 0x00, 0xF7,
	0x14, 0x14, 0x14, 0x17, 0x14,
	0x10, 0x10, 0x1F, 0x10, 0x1F,
	0x14, 0x14, 0x14, 0xF4, 0x14,
	0x10, 0x10, 0xF0, 0x10, 0xF0,
	0x00, 0x00, 0x1F, 0x10, 0x1F,
	0x00, 0x00, 0x00, 0x1F, 0x14,
	0x00, 0x00, 0x00, 0xFC, 0x14,
	0x00, 0x00, 0xF0, 0x10, 0xF0,
	0x10, 0x10, 0xFF, 0x10, 0xFF,
	0x14, 0x14, 0x14, 0xFF, 0x14,
	0x10, 0x10, 0x10, 0x1F, 0x00,
	0x00, 0x00, 0x00, 0xF0, 0x10,
	0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
	0xF0, 0xF0, 0xF0, 0xF0, 0xF0,
	0xFF, 0xFF, 0xFF, 0x00, 0x00,
	0x00, 0x00, 0x00, 0xFF, 0xFF,
	0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
	0x38, 0x44, 0x44, 0x38, 0x44,
	0x7C, 0x2A, 0x2A, 0x3E, 0x14,
	0x7E, 0x02, 0x02, 0x06, 0x06,
	0x02, 0x7E, 0x02, 0x7E, 0x02,
	0x63, 0x55, 0x49, 0x41, 0x63,
	0x38, 0x44, 0x44, 0x3C, 0x04,
	0x40, 0x7E, 0x20, 0x1E, 0x20,
	0x06, 0x02, 0x7E, 0x02, 0x02,
	0x99, 0xA5, 0xE7, 0xA5, 0x99,
	0x1C, 0x2A, 0x49, 0x2A, 0x1C,
	0x4C, 0x72, 0x01, 0x72, 0x4C,
	0x30, 0x4A, 0x4D, 0x4D, 0x30,
	0x30, 0x48, 0x78, 0x48, 0x30,
	0xBC, 0x62, 0x5A, 0x46, 0x3D,
	0x3E, 0x49, 0x49, 0x49, 0x00,
	0x7E, 0x01, 0x01, 0x01, 0x7E,
	0x2A, 0x2A, 0x2A, 0x2A, 0x2A,
	0x44, 0x44, 0x5F, 0x44, 0x44,
	0x40, 0x51, 0x4A, 0x44, 0x40,
	0x40, 0x44, 0x4A, 0x51, 0x40,
	0x00, 0x00, 0xFF, 0x01, 0x03,
	0xE0, 0x80, 0xFF, 0x00, 0x00,
	0x08, 0x08, 0x6B, 0x6B, 0x08,
	0x36, 0x12, 0x36, 0x24, 0x36,
	0x06, 0x0F, 0x09, 0x0F, 0x06,
	0x00, 0x00, 0x18, 0x18, 0x00,
	0x00, 0x00, 0x10, 0x10, 0x00,
	0x30, 0x40, 0xFF, 0x01, 0x01,
	0x00, 0x1F, 0x01, 0x01, 0x1E,
	0x00, 0x19, 0x1D, 0x17, 0x12,
	0x00, 0x3C, 0x3C, 0x3C, 0x3C,
	0x00, 0x00, 0x00, 0x00, 0x00
};

Adafruit_GFX::Adafruit_GFX(int16_t w, int16_t h):
  WIDTH(w), HEIGHT(h)
{
  _width    = WIDTH;
  _height   = HEIGHT;
  rotation  = 0;
  cursor_y  = cursor_x    = 0;
  textsize  = 1;
  textcolor = textbgcolor = 0xFFFF;
  wrap      = true;
}

// Draw a circle outline
void Adafruit_GFX::drawCircle(int16_t x0, int16_t y0, int16_t r,
    uint16_t color) {
  int16_t f = 1 - r;
  int16_t ddF_x = 1;
  int16_t ddF_y = -2 * r;
  int16_t x = 0;
  int16_t y = r;

  drawPixel(x0  , y0+r, color);
  drawPixel(x0  , y0-r, color);
  drawPixel(x0+r, y0  , color);
  drawPixel(x0-r, y0  , color);

  while (x<y) {
    if (f >= 0) {
      y--;
      ddF_y += 2;
      f += ddF_y;
    }
    x++;
    ddF_x += 2;
    f += ddF_x;

    drawPixel(x0 + x, y0 + y, color);
    drawPixel(x0 - x, y0 + y, color);
    drawPixel(x0 + x, y0 - y, color);
    drawPixel(x0 - x, y0 - y, color);
    drawPixel(x0 + y, y0 + x, color);
    drawPixel(x0 - y, y0 + x, color);
    drawPixel(x0 + y, y0 - x, color);
    drawPixel(x0 - y, y0 - x, color);
  }
}

void Adafruit_GFX::drawCircleHelper( int16_t x0, int16_t y0,
               int16_t r, uint8_t cornername, uint16_t color) {
  int16_t f     = 1 - r;
  int16_t ddF_x = 1;
  int16_t ddF_y = -2 * r;
  int16_t x     = 0;
  int16_t y     = r;

  while (x<y) {
    if (f >= 0) {
      y--;
      ddF_y += 2;
      f     += ddF_y;
    }
    x++;
    ddF_x += 2;
    f     += ddF_x;
    if (cornername & 0x4) {
      drawPixel(x0 + x, y0 + y, color);
      drawPixel(x0 + y, y0 + x, color);
    }
    if (cornername & 0x2) {
      drawPixel(x0 + x, y0 - y, color);
      drawPixel(x0 + y, y0 - x, color);
    }
    if (cornername & 0x8) {
      drawPixel(x0 - y, y0 + x, color);
      drawPixel(x0 - x, y0 + y, color);
    }
    if (cornername & 0x1) {
      drawPixel(x0 - y, y0 - x, color);
      drawPixel(x0 - x, y0 - y, color);
    }
  }
}

void Adafruit_GFX::fillCircle(int16_t x0, int16_t y0, int16_t r,
			      uint16_t color) {
  drawFastVLine(x0, y0-r, 2*r+1, color);
  fillCircleHelper(x0, y0, r, 3, 0, color);
}

// Used to do circles and roundrects
void Adafruit_GFX::fillCircleHelper(int16_t x0, int16_t y0, int16_t r,
    uint8_t cornername, int16_t delta, uint16_t color) {

  int16_t f     = 1 - r;
  int16_t ddF_x = 1;
  int16_t ddF_y = -2 * r;
  int16_t x     = 0;
  int16_t y     = r;

  while (x<y) {
    if (f >= 0) {
      y--;
      ddF_y += 2;
      f     += ddF_y;
    }
    x++;
    ddF_x += 2;
    f     += ddF_x;

    if (cornername & 0x1) {
      drawFastVLine(x0+x, y0-y, 2*y+1+delta, color);
      drawFastVLine(x0+y, y0-x, 2*x+1+delta, color);
    }
    if (cornername & 0x2) {
      drawFastVLine(x0-x, y0-y, 2*y+1+delta, color);
      drawFastVLine(x0-y, y0-x, 2*x+1+delta, color);
    }
  }
}

// Bresenham's algorithm - thx wikpedia
void Adafruit_GFX::drawLine(int16_t x0, int16_t y0,
			    int16_t x1, int16_t y1,
			    uint16_t color) {
  int16_t steep = abs(y1 - y0) > abs(x1 - x0);
  if (steep) {
    swap(x0, y0);
    swap(x1, y1);
  }

  if (x0 > x1) {
    swap(x0, x1);
    swap(y0, y1);
  }

  int16_t dx, dy;
  dx = x1 - x0;
  dy = abs(y1 - y0);

  int16_t err = dx / 2;
  int16_t ystep;

  if (y0 < y1) {
    ystep = 1;
  } else {
    ystep = -1;
  }

  for (; x0<=x1; x0++) {
    if (steep) {
      drawPixel(y0, x0, color);
    } else {
      drawPixel(x0, y0, color);
    }
    err -= dy;
    if (err < 0) {
      y0 += ystep;
      err += dx;
    }
  }
}

// Draw a rectangle
void Adafruit_GFX::drawRect(int16_t x, int16_t y,
			    int16_t w, int16_t h,
			    uint16_t color) {
  drawFastHLine(x, y, w, color);
  drawFastHLine(x, y+h-1, w, color);
  drawFastVLine(x, y, h, color);
  drawFastVLine(x+w-1, y, h, color);
}

void Adafruit_GFX::drawFastVLine(int16_t x, int16_t y,
				 int16_t h, uint16_t color) {
  // Update in subclasses if desired!
  drawLine(x, y, x, y+h-1, color);
}

void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y,
				 int16_t w, uint16_t color) {
  // Update in subclasses if desired!
  drawLine(x, y, x+w-1, y, color);
}

void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
			    uint16_t color) {
  // Update in subclasses if desired!
  for (int16_t i=x; i<x+w; i++) {
    drawFastVLine(i, y, h, color);
  }
}

void Adafruit_GFX::fillScreen(uint16_t color) {
  fillRect(0, 0, _width, _height, color);
}

// Draw a rounded rectangle
void Adafruit_GFX::drawRoundRect(int16_t x, int16_t y, int16_t w,
  int16_t h, int16_t r, uint16_t color) {
  // smarter version
  drawFastHLine(x+r  , y    , w-2*r, color); // Top
  drawFastHLine(x+r  , y+h-1, w-2*r, color); // Bottom
  drawFastVLine(x    , y+r  , h-2*r, color); // Left
  drawFastVLine(x+w-1, y+r  , h-2*r, color); // Right
  // draw four corners
  drawCircleHelper(x+r    , y+r    , r, 1, color);
  drawCircleHelper(x+w-r-1, y+r    , r, 2, color);
  drawCircleHelper(x+w-r-1, y+h-r-1, r, 4, color);
  drawCircleHelper(x+r    , y+h-r-1, r, 8, color);
}

// Fill a rounded rectangle
void Adafruit_GFX::fillRoundRect(int16_t x, int16_t y, int16_t w,
				 int16_t h, int16_t r, uint16_t color) {
  // smarter version
  fillRect(x+r, y, w-2*r, h, color);

  // draw four corners
  fillCircleHelper(x+w-r-1, y+r, r, 1, h-2*r-1, color);
  fillCircleHelper(x+r    , y+r, r, 2, h-2*r-1, color);
}

// Draw a triangle
void Adafruit_GFX::drawTriangle(int16_t x0, int16_t y0,
				int16_t x1, int16_t y1,
				int16_t x2, int16_t y2, uint16_t color) {
  drawLine(x0, y0, x1, y1, color);
  drawLine(x1, y1, x2, y2, color);
  drawLine(x2, y2, x0, y0, color);
}

// Fill a triangle
void Adafruit_GFX::fillTriangle ( int16_t x0, int16_t y0,
				  int16_t x1, int16_t y1,
				  int16_t x2, int16_t y2, uint16_t color) {

  int16_t a, b, y, last;

  // Sort coordinates by Y order (y2 >= y1 >= y0)
  if (y0 > y1) {
    swap(y0, y1); swap(x0, x1);
  }
  if (y1 > y2) {
    swap(y2, y1); swap(x2, x1);
  }
  if (y0 > y1) {
    swap(y0, y1); swap(x0, x1);
  }

  if(y0 == y2) { // Handle awkward all-on-same-line case as its own thing
    a = b = x0;
    if(x1 < a)      a = x1;
    else if(x1 > b) b = x1;
    if(x2 < a)      a = x2;
    else if(x2 > b) b = x2;
    drawFastHLine(a, y0, b-a+1, color);
    return;
  }

  int16_t
    dx01 = x1 - x0,
    dy01 = y1 - y0,
    dx02 = x2 - x0,
    dy02 = y2 - y0,
    dx12 = x2 - x1,
    dy12 = y2 - y1,
    sa   = 0,
    sb   = 0;

  // For upper part of triangle, find scanline crossings for segments
  // 0-1 and 0-2.  If y1=y2 (flat-bottomed triangle), the scanline y1
  // is included here (and second loop will be skipped, avoiding a /0
  // error there), otherwise scanline y1 is skipped here and handled
  // in the second loop...which also avoids a /0 error here if y0=y1
  // (flat-topped triangle).
  if(y1 == y2) last = y1;   // Include y1 scanline
  else         last = y1-1; // Skip it

  for(y=y0; y<=last; y++) {
    a   = x0 + sa / dy01;
    b   = x0 + sb / dy02;
    sa += dx01;
    sb += dx02;
    /* longhand:
    a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
    b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
    */
    if(a > b) swap(a,b);
    drawFastHLine(a, y, b-a+1, color);
  }

  // For lower part of triangle, find scanline crossings for segments
  // 0-2 and 1-2.  This loop is skipped if y1=y2.
  sa = dx12 * (y - y1);
  sb = dx02 * (y - y0);
  for(; y<=y2; y++) {
    a   = x1 + sa / dy12;
    b   = x0 + sb / dy02;
    sa += dx12;
    sb += dx02;
    /* longhand:
    a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
    b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
    */
    if(a > b) swap(a,b);
    drawFastHLine(a, y, b-a+1, color);
  }
}

void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
			      const uint8_t *bitmap, int16_t w, int16_t h,
			      uint16_t color) {

  int16_t i, j, byteWidth = (w + 7) / 8;

  for(j=0; j<h; j++) {
    for(i=0; i<w; i++ ) {
      if(pgm_read_byte(bitmap + j * byteWidth + i / 8) & (128 >> (i & 7))) {
	drawPixel(x+i, y+j, color);
      }
    }
  }
}

size_t Adafruit_GFX::write(uint8_t c) {

  if (c == '\n') {
    cursor_y += textsize*8;
    cursor_x  = 0;
  } else if (c == '\r') {
    // skip em
  } else {
    drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize);
    cursor_x += textsize*6;
    if (wrap && (cursor_x > (_width - textsize*6))) {
      cursor_y += textsize*8;
      cursor_x = 0;
    }
  }
  return 1;
}

// Draw a character
void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
			    uint16_t color, uint16_t bg, uint8_t size) {

  if((x >= _width)            || // Clip right
     (y >= _height)           || // Clip bottom
     ((x + 6 * size - 1) < 0) || // Clip left
     ((y + 8 * size - 1) < 0))   // Clip top
    return;

  for (int8_t i=0; i<6; i++ ) {
    uint8_t line;
    if (i == 5)
      line = 0x0;
    else
      line = pgm_read_byte(font+(c*5)+i);
    for (int8_t j = 0; j<8; j++) {
      if (line & 0x1) {
        if (size == 1) // default size
          drawPixel(x+i, y+j, color);
        else {  // big size
          fillRect(x+(i*size), y+(j*size), size, size, color);
        }
      } else if (bg != color) {
        if (size == 1) // default size
          drawPixel(x+i, y+j, bg);
        else {  // big size
          fillRect(x+i*size, y+j*size, size, size, bg);
        }
      }
      line >>= 1;
    }
  }
}

void Adafruit_GFX::setCursor(int16_t x, int16_t y) {
  cursor_x = x;
  cursor_y = y;
}

void Adafruit_GFX::setTextSize(uint8_t s) {
  textsize = (s > 0) ? s : 1;
}

void Adafruit_GFX::setTextColor(uint16_t c) {
  // For 'transparent' background, we'll set the bg
  // to the same as fg instead of using a flag
  textcolor = textbgcolor = c;
}

void Adafruit_GFX::setTextColor(uint16_t c, uint16_t b) {
  textcolor   = c;
  textbgcolor = b;
}

void Adafruit_GFX::setTextWrap(boolean w) {
  wrap = w;
}

uint8_t Adafruit_GFX::getRotation(void) {
  return rotation;
}

void Adafruit_GFX::setRotation(uint8_t x) {
  rotation = (x & 3);
  switch(rotation) {
   case 0:
   case 2:
    _width  = WIDTH;
    _height = HEIGHT;
    break;
   case 1:
   case 3:
    _width  = HEIGHT;
    _height = WIDTH;
    break;
  }
}

// Return the size of the display (per current rotation)
int16_t Adafruit_GFX::width(void) {
  return _width;
}

int16_t Adafruit_GFX::height(void) {
  return _height;
}

void Adafruit_GFX::invertDisplay(boolean i) {
  // Do nothing, must be subclassed if supported
}

HX711ADC.h

C/C++
Library for load cell amplifier
#pragma once

#if defined(PARTICLE)
#  include <Particle.h>
#else
#  if ARDUINO >= 100
#    include "Arduino.h"
#  else
#    include "WProgram.h"
#  endif
#endif
#include <math.h>

class HX711ADC
{
	private:
		byte PD_SCK;	// Power Down and Serial Clock Input Pin
		byte DOUT;		// Serial Data Output Pin
		byte GAIN;		// amplification factor
		long OFFSET = 0;	// used for tare weight
		float SCALE = 1;	// used to return weight in grams, kg, ounces, whatever

	public:
		// define clock and data pin, channel, and gain factor
		// channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B
		// gain: 128 or 64 for channel A; channel B works with 32 gain factor only
		HX711ADC(byte dout, byte pd_sck, byte gain = 128);

		HX711ADC();

		virtual ~HX711ADC();

		// Allows to set the pins and gain later than in the constructor
		void begin(byte dout, byte pd_sck, byte gain = 128);

		// check if HX711 is ready
		// from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high. Serial clock
		// input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval.
		inline bool is_ready() { return !digitalRead(DOUT); };

		// set the gain factor; takes effect only after a call to read()
		// channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain
		// depending on the parameter, the channel is also set to either A or B
		void set_gain(byte gain = 128);

		// waits for the chip to be ready and returns a reading (1sec default timeout)
		long read(time_t timeout = 1000);

		// returns an average reading; times = how many times to read
		long read_average(byte times = 1);

		// returns (read_average() - OFFSET), that is the current value without the tare weight; times = how many readings to do
		double get_value(byte times = 1);

		// returns get_value() divided by SCALE, that is the raw value divided by a value obtained via calibration
		// times = how many readings to do
		float get_units(byte times = 1);

		// set the OFFSET value for tare weight; times = how many times to read the tare value
		void tare(byte times = 10);

		// set the SCALE value; this value is used to convert the raw data to "human readable" data (measure units)
		void set_scale(float scale = 1.f);

		// get the current SCALE
		float get_scale();

		// set OFFSET, the value that's subtracted from the actual reading (tare weight)
		void set_offset(long offset = 0);

		// get the current OFFSET
		long get_offset();

		// puts the chip into power down mode
		void power_down();

		// wakes up the chip after power down mode
		void power_up();

#if defined(PARTICLE) 
    // to keep the Particle cloud happy when the library blocks
    inline void yield() { Particle.process(); }; 
#endif
};

HX711ADC.cpp

C/C++
Library for load cell amplifier
#include "HX711ADC.h"

HX711ADC::HX711ADC(byte dout, byte pd_sck, byte gain) {
	begin(dout, pd_sck, gain);
}

HX711ADC::HX711ADC() {
}

HX711ADC::~HX711ADC() {
}

void HX711ADC::begin(byte dout, byte pd_sck, byte gain) {
	PD_SCK = pd_sck;
	DOUT = dout;

	pinMode(PD_SCK, OUTPUT);
	pinMode(DOUT, INPUT);

	set_gain(gain);
}

void HX711ADC::set_gain(byte gain) {
	switch (gain) {
		case 128:		// channel A, gain factor 128
			GAIN = 1;
			break;
		case 64:		// channel A, gain factor 64
			GAIN = 3;
			break;
		case 32:		// channel B, gain factor 32
			GAIN = 2;
			break;
	}

	digitalWrite(PD_SCK, LOW);
	//read();
}

long HX711ADC::read(time_t timeout) {
	// wait for the chip to become ready
	for (time_t ms=millis(); !is_ready() && (millis() - ms < timeout);) {
		// Will do nothing on Arduino but 
    // prevent resets of ESP8266 (Watchdog Issue)
    // or keeps cloud housekeeping running on Particle devices
		yield();
	}
  // still not ready after timeout periode, report error Not-A-Number
  if (!is_ready()) return NAN;

	unsigned long value = 0;
	uint8_t data[3] = { 0 };
	uint8_t filler = 0x00;

	// pulse the clock pin 24 times to read the data
	data[2] = shiftIn(DOUT, PD_SCK, MSBFIRST);
	data[1] = shiftIn(DOUT, PD_SCK, MSBFIRST);
	data[0] = shiftIn(DOUT, PD_SCK, MSBFIRST);

	// set the channel and the gain factor for the next reading using the clock pin
	for (unsigned int i = 0; i < GAIN; i++) {
		digitalWrite(PD_SCK, HIGH);
		digitalWrite(PD_SCK, LOW);
	}

	// Replicate the most significant bit to pad out a 32-bit signed integer
	if (data[2] & 0x80) {
		filler = 0xFF;
	} else {
		filler = 0x00;
	}

	// Construct a 32-bit signed integer
	value = static_cast<unsigned long>(filler)  << 24
		  | static_cast<unsigned long>(data[2]) << 16
		  | static_cast<unsigned long>(data[1]) << 8
		  | static_cast<unsigned long>(data[0]) ;

	return static_cast<long>(value);
}

long HX711ADC::read_average(byte times) {
  if (times <= 0) return NAN;
	long sum = 0;
	for (byte i = 0; i < times; i++) {
		sum += read();
		yield();
	}
	return sum / times;
}

double HX711ADC::get_value(byte times) {
	return read_average(times) - OFFSET;
}

float HX711ADC::get_units(byte times) {
	return get_value(times) / SCALE;
}

void HX711ADC::tare(byte times) {
	double sum = read_average(times);
	set_offset(sum);
}

void HX711ADC::set_scale(float scale) {
  if (scale) {
	  SCALE = scale;
  }
  else {
    SCALE = 1;
  }
}

float HX711ADC::get_scale() {
	return SCALE;
}

void HX711ADC::set_offset(long offset) {
	OFFSET = offset;
}

long HX711ADC::get_offset() {
	return OFFSET;
}

void HX711ADC::power_down() {
	digitalWrite(PD_SCK, LOW);
	digitalWrite(PD_SCK, HIGH);
}

void HX711ADC::power_up() {
	digitalWrite(PD_SCK, LOW);
}

Adafruit_SSD1306.h

C/C++
Library File
/*********************************************************************
This is a library for our Monochrome OLEDs based on SSD1306 drivers
  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98
These displays use SPI to communicate, 4 or 5 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada  for Adafruit Industries.
BSD license, check license.txt for more information
All text above, and the splash screen must be included in any redistribution
*********************************************************************/


#include "application.h"
#include "Adafruit_GFX.h"


#define BLACK 0
#define WHITE 1

#define SSD1306_I2C_ADDRESS   0x3C	// 011110+SA0+RW - 0x3C or 0x3D
// Address for 128x32 is 0x3C
// Address for 128x64 is 0x3D (default) or 0x3C (if SA0 is grounded)

/*=========================================================================
    SSD1306 Displays
    -----------------------------------------------------------------------
    The driver is used in multiple displays (128x64, 128x32, etc.).
    Select the appropriate display below to create an appropriately
    sized framebuffer, etc.
    SSD1306_128_64  128x64 pixel display
    SSD1306_128_32  128x32 pixel display
    -----------------------------------------------------------------------*/
#define SSD1306_128_64
//#define SSD1306_128_32
/*=========================================================================*/

#if defined SSD1306_128_64 && defined SSD1306_128_32
  #error "Only one SSD1306 display can be specified at once in SSD1306.h"
#endif
#if !defined SSD1306_128_64 && !defined SSD1306_128_32
  #error "At least one SSD1306 display must be specified in SSD1306.h"
#endif

#if defined SSD1306_128_64
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 64
#endif
#if defined SSD1306_128_32
  #define SSD1306_LCDWIDTH                  128
  #define SSD1306_LCDHEIGHT                 32
#endif

#define SSD1306_SETCONTRAST 0x81
#define SSD1306_DISPLAYALLON_RESUME 0xA4
#define SSD1306_DISPLAYALLON 0xA5
#define SSD1306_NORMALDISPLAY 0xA6
#define SSD1306_INVERTDISPLAY 0xA7
#define SSD1306_DISPLAYOFF 0xAE
#define SSD1306_DISPLAYON 0xAF

#define SSD1306_SETDISPLAYOFFSET 0xD3
#define SSD1306_SETCOMPINS 0xDA

#define SSD1306_SETVCOMDETECT 0xDB

#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
#define SSD1306_SETPRECHARGE 0xD9

#define SSD1306_SETMULTIPLEX 0xA8

#define SSD1306_SETLOWCOLUMN 0x00
#define SSD1306_SETHIGHCOLUMN 0x10

#define SSD1306_SETSTARTLINE 0x40

#define SSD1306_MEMORYMODE 0x20
#define SSD1306_COLUMNADDR 0x21
#define SSD1306_PAGEADDR   0x22

#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8

#define SSD1306_SEGREMAP 0xA0

#define SSD1306_CHARGEPUMP 0x8D

#define SSD1306_EXTERNALVCC 0x1
#define SSD1306_SWITCHCAPVCC 0x2

// Scrolling #defines
#define SSD1306_ACTIVATE_SCROLL 0x2F
#define SSD1306_DEACTIVATE_SCROLL 0x2E
#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3
#define SSD1306_RIGHT_HORIZONTAL_SCROLL 0x26
#define SSD1306_LEFT_HORIZONTAL_SCROLL 0x27
#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL 0x2A

class Adafruit_SSD1306 : public Adafruit_GFX {
 public:
  Adafruit_SSD1306(int8_t SID, int8_t SCLK, int8_t DC, int8_t RST, int8_t CS);
  Adafruit_SSD1306(int8_t DC, int8_t RST, int8_t CS);
  Adafruit_SSD1306(int8_t RST);

  void begin(uint8_t switchvcc = SSD1306_SWITCHCAPVCC, uint8_t i2caddr = SSD1306_I2C_ADDRESS);
  void ssd1306_command(uint8_t c);
  void ssd1306_data(uint8_t c);

  void clearDisplay(void);
  void invertDisplay(uint8_t i);
  void display();

  void startscrollright(uint8_t start, uint8_t stop);
  void startscrollleft(uint8_t start, uint8_t stop);

  void startscrolldiagright(uint8_t start, uint8_t stop);
  void startscrolldiagleft(uint8_t start, uint8_t stop);
  void stopscroll(void);

  void dim(bool dim);

  void drawPixel(int16_t x, int16_t y, uint16_t color);

  virtual void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
  virtual void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);

 private:
  int8_t _i2caddr, _vccstate, sid, sclk, dc, rst, cs;
  void fastSPIwrite(uint8_t c);

  boolean hwSPI;

  inline void drawFastVLineInternal(int16_t x, int16_t y, int16_t h, uint16_t color) __attribute__((always_inline));
  inline void drawFastHLineInternal(int16_t x, int16_t y, int16_t w, uint16_t color) __attribute__((always_inline));

};

Credits

Sam Leach

Sam Leach

1 project • 0 followers
Bryant Kesler

Bryant Kesler

1 project • 0 followers

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