Water-Bottle-LED-Arduino/water-bottle-led.ino at main · Ivan-Corporation/Water-Bottle-LED-Arduino · GitHub

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// LED connection pins
int rpin = 11;  // red
int gpin = 10; // green
int bpin = 9; // blue
float h = 0; //hue
int r=0, g=0, b=0; // color values
void setup()
{
}
void loop()
{
  // Each time the hue value increases 0.001
  // and goes back to the beginning when it is 1
  h = h + 0.001;
  if(h >= 1.0){
  h = 0;
  }
  // Hue value turn to b,g,b
  h2rgb(h,r,g,b);

// common cathode RGB LED
  analogWrite(rpin, r);
  analogWrite(gpin, g);
  analogWrite(bpin, b);
  delay(15);
}
void h2rgb(float H, int& R, int& G, int& B) {
  int var_i;
  float S=1, V=1, var_1, var_2, var_3, var_h, var_r, var_g, var_b;
  if ( S == 0 )
  {
    R = V * 255;
    G = V * 255;
    B = V * 255;
  }
  else
  {
    var_h = H * 6;
    if ( var_h == 6 ) var_h = 0;
    var_i = int( var_h ) ;
    var_1 = V * ( 1 - S );
    var_2 = V * ( 1 - S * ( var_h - var_i ) );
    var_3 = V * ( 1 - S * ( 1 - ( var_h - var_i ) ) );
    if ( var_i == 0 ) {
      var_r = V     ;
      var_g = var_3 ;
      var_b = var_1 ;
    }
    else if ( var_i == 1 ) {
      var_r = var_2 ;
      var_g = V;
      var_b = var_1 ;
    }
    else if ( var_i == 2 ) {
      var_r = var_1 ;
      var_g = V;
      var_b = var_3 ;
    }
    else if ( var_i == 3 ) {

      var_r = var_1 ;
      var_g = var_2 ;
      var_b = V;
    }
    else if ( var_i == 4 ) {
      var_r = var_3 ;
      var_g = var_1 ;
      var_b = V;
    }
    else {
    var_r = V;
    var_g = var_1 ;
    var_b = var_2 ;
    }
    R = (1-var_r) * 255;
    G = (1-var_g) * 255;
    B = (1-var_b) * 255;
  }
}