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Have you ever wanted to interact with an RGB LED strip using the web? The Spark ecosystem allows you to take that one step further and allow anyone to use the same webpage to interact with their own device using your firmware!
It uses Node.js and SparkJS to provide the web UI and interact with a Spark account's claimed devices.
This was also used as a device in the Open Source Home Hub!
The code for both the Spark Core (firmware.bin or spark-rgb.ino) and Node.js webpage can all be found on Github.
as seen in https://learn.adafruit.com/digital-led-strip/wiring
const int stripClock = D2;
const int stripData = D3;
int stripLen = 48;
bool animateBool = false;
typedef struct _PIXEL_VALUES {
byte Green;
byte Red;
byte Blue;
} PIXEL_VALUES, *PPIXEL_VALUES;
// Array of stored Pixel values
PIXEL_VALUES *Pixels;
PIXEL_VALUES *PixelsMax;
// Custom Functions for working with the RGB Pixel Strip
int scaleColor(int color);
void changeSize(String command);
void SetPixel(int pixel, byte Red, byte Green, byte Blue);
void ShiftPixel(int pixel);
void ShiftAllPixels();
void SetPixelAltered(int pixel, byte Red, byte Green, byte Blue);
void setup()
{
Pixels = new PIXEL_VALUES[stripLen];
PixelsMax = new PIXEL_VALUES[stripLen];
// Defining Spark Variables
Spark.variable("animateBool", &animateBool, INT);
// Defining Spark Functions
Spark.function("switchColor", switchColor);
Spark.function("seahawks", seahawksColors); // can't be longer than 12 characters
Spark.function("animate", animateColors);
// Set pins to outputs
pinMode(stripClock, OUTPUT);
pinMode(stripData, OUTPUT);
digitalWrite(stripClock, LOW);
digitalWrite(stripData, LOW);
// Reset all the pixels
for (int i = 0; i < stripLen; i++)
{
SetPixel(i, 127, 127, 127);
}
ShiftAllPixels();
}
void loop()
{
if (animateBool == true)
{
for (int j = 0; j <= 100; j++)
{
for (int i = 0; i < stripLen; i++)
{
int red = (PixelsMax[i].Red * j / 100);
int green = (PixelsMax[i].Green * j / 100);
int blue = (PixelsMax[i].Blue * j / 100);
SetPixelAltered(i, (scaleColor(red) & 0x7F), (scaleColor(green) & 0x7F), (scaleColor(blue) & 0x7F));
}
ShiftAllPixels();
}
for (int j = 100; j >= 0; j--)
{
for (int i = 0; i < stripLen; i++)
{
int red = (PixelsMax[i].Red * j / 100);
int green = (PixelsMax[i].Green * j / 100);
int blue = (PixelsMax[i].Blue * j / 100);
SetPixelAltered(i, (scaleColor(red) & 0x7F), (scaleColor(green) & 0x7F), (scaleColor(blue) & 0x7F));
}
ShiftAllPixels();
}
}
}
int scaleColor(int color)
{
return (double) color / 255 * 127;
}
void changeSize(String command)
{
String length = command;
length.remove(3);
int l = length.toInt();
if (l != stripLen)
{
// Reset all the pixels prior to resetting it
for (int i = l; i < stripLen; i++)
{
SetPixel(i, 0, 0, 0);
}
ShiftAllPixels();
stripLen = l;
Pixels = new PIXEL_VALUES[stripLen];
PixelsMax = new PIXEL_VALUES[stripLen];
}
}
int switchColor(String command)
{
// command will be of format 048,127,127,127,100,100,100,100,100
// R,G,B,BottomBrightness,RightBrightness,BackBrightness,LeftBrightness,TopBrightness
// any values less than 127 will be filled with spaces
// The strip is divided into groups of 4 per side. First 4 are bottom, Next 4 are right, etc.
changeSize(command);
command.remove(0, 4);
String red = command;
String green = command;
String blue = command;
red.remove(3);
green.remove(0, 4);
green.remove(3);
blue.remove(0, 8);
blue.remove(3);
int redInt = scaleColor(red.toInt());
int greenInt = scaleColor(green.toInt());
int blueInt = scaleColor(blue.toInt());
String bottom = command;
String right = command;
String back = command;
String left = command;
String top = command;
bottom.remove(0, 12);
bottom.remove(3);
right.remove(0, 16);
right.remove(3);
back.remove(0, 20);
back.remove(3);
left.remove(0, 24);
left.remove(3);
top.remove(0, 28);
int bottomInt = bottom.toInt();
int rightInt = right.toInt();
int backInt = back.toInt();
int leftInt = left.toInt();
int topInt = top.toInt();
int pixelsPerSide = stripLen / 5;
for (int i = 0; i < stripLen; i++)
{
if (i < pixelsPerSide)
{
SetPixel(i, ((redInt * bottomInt / 100) & 0x7F), ((greenInt * bottomInt / 100) & 0x7F), ((blueInt * bottomInt / 100) & 0x7F));
}
else if (i < (pixelsPerSide * 2))
{
SetPixel(i, ((redInt * rightInt / 100) & 0x7F), ((greenInt * rightInt / 100) & 0x7F), ((blueInt * rightInt / 100) & 0x7F));
}
else if (i < (pixelsPerSide * 3))
{
SetPixel(i, ((redInt * backInt / 100) & 0x7F), ((greenInt * backInt / 100) & 0x7F), ((blueInt * backInt / 100) & 0x7F));
}
else if (i < (pixelsPerSide * 4))
{
SetPixel(i, ((redInt * leftInt / 100) & 0x7F), ((greenInt * leftInt / 100) & 0x7F), ((blueInt * leftInt / 100) & 0x7F));
}
else if (i < (pixelsPerSide * 5))
{
SetPixel(i, ((redInt * topInt / 100) & 0x7F), ((greenInt * topInt / 100) & 0x7F), ((blueInt * topInt / 100) & 0x7F));
}
else
{
SetPixel(i, (redInt & 0x7F), (greenInt & 0x7F), (blueInt & 0x7F));
}
}
ShiftAllPixels();
return 1;
}
int seahawksColors(String command)
{
changeSize(command);
// Set the pixels to Green
for (int i = 0; i < stripLen; i++)
{
if (i % 2 == 0)
{
SetPixel(i, 0, (i & 0x7F), 0);
}
else
{
SetPixel(i, 0, 0, (i & 0x7F));
}
}
ShiftAllPixels();
return 1;
}
int animateColors(String command)
{
changeSize(command);
animateBool = !animateBool;
return 1;
}
// Sets the pixel color in our array
void SetPixel(int pixel, byte Red, byte Green, byte Blue)
{
if (pixel < stripLen)
{
Pixels[pixel].Red = Red | 0x80;
Pixels[pixel].Green = Green | 0x80;
Pixels[pixel].Blue = Blue | 0x80;
PixelsMax[pixel].Red = Red | 0x80;
PixelsMax[pixel].Green = Green | 0x80;
PixelsMax[pixel].Blue = Blue | 0x80;
}
}
void SetPixelAltered(int pixel, byte Red, byte Green, byte Blue)
{
if (pixel < stripLen)
{
Pixels[pixel].Red = Red | 0x80;
Pixels[pixel].Green = Green | 0x80;
Pixels[pixel].Blue = Blue | 0x80;
}
}
// Sends the color of a pixel to the strip
void ShiftPixel(int pixel)
{
PPIXEL_VALUES PixelValues = &Pixels[pixel];
byte bit;
int i;
for (i = 7; i >= 0; i--)
{
bit = (PixelValues->Green >> i) & 0x01;
digitalWrite(stripData, bit);
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 7; i >= 0; i--)
{
bit = (PixelValues->Red >> i) & 0x01;
digitalWrite(stripData, bit);
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 7; i >= 0; i--)
{
bit = (PixelValues->Blue >> i) & 0x01;
digitalWrite(stripData, bit);
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
}
// Sends all the pixel colors to the strip
void ShiftAllPixels()
{
int i;
digitalWrite(stripData, 0);
for (i = 0; i < 8; i++)
{
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 0; i < 8; i++)
{
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 0; i < 8; i++)
{
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 0; i < stripLen; i++)
{
ShiftPixel(i);
}
digitalWrite(stripData, 0);
for (i = 0; i < 8; i++)
{
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
for (i = 0; i < 8; i++)
{
digitalWrite(stripClock, HIGH);
digitalWrite(stripClock, LOW);
}
delay(100);
}
Anthony Ngu
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