Kiyara Elaine HillChioma Nwakalor
Published © GPL3+

Temperature Monitor and Display with Two Particle Photons

The communication of temperature measurements between two Particle Photons using a temperature sensor as the detection device.

EasyFull instructions provided4 hours70
Temperature Monitor and Display with Two Particle Photons

Things used in this project

Hardware components

Particle Photon
Solderless Breadboard Half Size
Solderless Breadboard Half Size
Temperature Sensor
Temperature Sensor
SparkFun Jumper wires (generic)
USB-A to Micro-USB Cable
USB-A to Micro-USB Cable
Resistor 4.75k ohm
Resistor 4.75k ohm
Grove - OLED Display 1.12'' V2
Seeed Grove - OLED Display 1.12'' V2

Software apps and online services

Particle Pi
Particle Pi
Google Sheets
Google Sheets
Maker service
IFTTT Maker service


Read more


Temperature vs Time Chart

A visual comparison of the temperature with respect to time measurements
Temperature vs  time g3jv344900

Google Docs Representation of Chart

Google docs visualization of the temperature versus time measurement
Temp vs time google doc zo2bxsoqb7

Temperature Display Schematic

A temperature display breadboard schematic of the photon. Note on the OLED schematic, starting from the left, the pins are CS, DC, RST, D1, D0, VCC, GND. These are connected to the particle pins (in the same order as above): D4, D3, D5, A5, A3, 3V3, GND (on the analog side).
Temp display 2 2dl9e08aiu

Temperature Sensor Circuit Schematic

This is the circuit diagram for our temperature sensing photon. Note the picture shows a 220 ohm resistor, however in our project we used a 10k ohm resistor.
Screen shot 2018 11 18 at 7 56 42 pm mjwnv00dph


Temperature Sensor Code

// This #include statement was automatically added by the Particle IDE.
#include <OneWire.h>

This sketch reads the temperature from a 1-Wire device and then publishes
to the Particle cloud. From there, IFTTT can be used to log the date,
time, and temperature to a Google Spreadsheet. Read more in our tutorial

This sketch is the same as the example from the OneWire library, but
with the addition of three lines at the end to publish the data to the

Use this sketch to read the temperature from 1-Wire devices
you have attached to your Particle device (core, p0, p1, photon, electron)

Temperature is read from: DS18S20, DS18B20, DS1822, DS2438

Expanding on the enumeration process in the address scanner, this example
reads the temperature and outputs it from known device types as it scans.

I/O setup:
These made it easy to just 'plug in' my 18B20 (note that a bare TO-92
sensor may read higher than it should if it's right next to the Photon)

D3 - 1-wire ground, or just use regular pin and comment out below.
D4 - 1-wire signal, 2K-10K resistor to D5 (3v3)
D5 - 1-wire power, ditto ground comment.

A pull-up resistor is required on the signal line. The spec calls for a 4.7K.
I have used 1K-10K depending on the bus configuration and what I had out on the
bench. If you are powering the device, they all work. If you are using parisidic
power it gets more picky about the value.

OneWire ds = OneWire(D4);  // 1-wire signal on pin D4

unsigned long lastUpdate = 0;

float lastTemp;

void setup() {
  // Set up 'power' pins, comment out if not used!
  pinMode(D3, OUTPUT);
  pinMode(D5, OUTPUT);
  digitalWrite(D3, LOW);
  digitalWrite(D5, HIGH);

// up to here, it is the same as the address acanner
// we need a few more variables for this example

void loop(void) {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius, fahrenheit;

  if ( ! {
    Serial.println("No more addresses.");

  // The order is changed a bit in this example
  // first the returned address is printed

  Serial.print("ROM =");
  for( i = 0; i < 8; i++) {
    Serial.write(' ');
    Serial.print(addr[i], HEX);

  // second the CRC is checked, on fail,
  // print error and just return to try again

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");

  // we have a good address at this point
  // what kind of chip do we have?
  // we will set a type_s value for known types or just return

  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      Serial.println("  Chip = DS1820/DS18S20");
      type_s = 1;
    case 0x28:
      Serial.println("  Chip = DS18B20");
      type_s = 0;
    case 0x22:
      Serial.println("  Chip = DS1822");
      type_s = 0;
    case 0x26:
      Serial.println("  Chip = DS2438");
      type_s = 2;
      Serial.println("Unknown device type.");

  // this device has temp so let's read it

  ds.reset();               // first clear the 1-wire bus;          // now select the device we just found
  // ds.write(0x44, 1);     // tell it to start a conversion, with parasite power on at the end
  ds.write(0x44, 0);        // or start conversion in powered mode (bus finishes low)

  // just wait a second while the conversion takes place
  // different chips have different conversion times, check the specs, 1 sec is worse case + 250ms
  // you could also communicate with other devices if you like but you would need
  // to already know their address to select them.

  delay(1000);     // maybe 750ms is enough, maybe not, wait 1 sec for conversion

  // we might do a ds.depower() (parasite) here, but the reset will take care of it.

  // first make sure current values are in the scratch pad

  present = ds.reset();;
  ds.write(0xB8,0);         // Recall Memory 0
  ds.write(0x00,0);         // Recall Memory 0

  // now read the scratch pad

  present = ds.reset();;
  ds.write(0xBE,0);         // Read Scratchpad
  if (type_s == 2) {
    ds.write(0x00,0);       // The DS2438 needs a page# to read

  // transfer and print the values

  Serial.print("  Data = ");
  Serial.print(present, HEX);
  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] =;
    Serial.print(data[i], HEX);
    Serial.print(" ");
  Serial.print(" CRC=");
  Serial.print(OneWire::crc8(data, 8), HEX);

  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t raw = (data[1] << 8) | data[0];
  if (type_s == 2) raw = (data[2] << 8) | data[1];
  byte cfg = (data[4] & 0x60);

  switch (type_s) {
    case 1:
      raw = raw << 3; // 9 bit resolution default
      if (data[7] == 0x10) {
        // "count remain" gives full 12 bit resolution
        raw = (raw & 0xFFF0) + 12 - data[6];
      celsius = (float)raw * 0.0625;
    case 0:
      // at lower res, the low bits are undefined, so let's zero them
      if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
      if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
      if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
      // default is 12 bit resolution, 750 ms conversion time
      celsius = (float)raw * 0.0625;

    case 2:
      data[1] = (data[1] >> 3) & 0x1f;
      if (data[2] > 127) {
        celsius = (float)data[2] - ((float)data[1] * .03125);
        celsius = (float)data[2] + ((float)data[1] * .03125);

  // remove random errors
  if((((celsius <= 0 && celsius > -1) && lastTemp > 5)) || celsius > 125) {
      celsius = lastTemp;

  fahrenheit = celsius * 1.8 + 32.0;
  lastTemp = celsius;
  Serial.print("  Temperature = ");
  Serial.print(" Celsius, ");
  Serial.println(" Fahrenheit");

  // now that we have the readings, we can publish them to the cloud
  String temperature = String(fahrenheit); // store temp in "temperature" string
  Particle.publish("temperature", temperature, PRIVATE); // publish to cloud
  delay(10000); // 10 sec delay //every 1 second is "1000"

Temperature Display Code

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_SSD1306.h>

#define OLED_DC     D3
#define OLED_CS     D4
#define OLED_RESET  D5

char temp[9];
String tempO;

Adafruit_SSD1306 display(OLED_DC, OLED_RESET, OLED_CS);

void setup()  
    Particle.subscribe("temperature", myHandler, MY_DEVICES);


void loop() 
    display.printf("Inside Temp:  %0.4s F", temp);

void myHandler(const char *event, const char *data)




Kiyara Elaine Hill

Kiyara Elaine Hill

2 projects • 1 follower
Chioma Nwakalor

Chioma Nwakalor

2 projects • 1 follower


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