#define input A6
#define transistor 2
#define red 3
#define green 4
#define blue 5
int onTime = 5000; //in ms
int inputTrigger = 500; //0-1024
void setup()
{
  pinMode(input, INPUT);
  pinMode(transistor, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  int read = analogRead(A6);
  Serial.println(read);
  if (read > inputTrigger);
  {
    unsigned long startTime = millis();
    unsigned long endTime = startTime + onTime;
    while(endTime > millis()) {
        int hue = map(millis(), startTime, endTime, 0, 240); //0 (Rot) -> 240 (Blau) (HUE Farbskala)
        int rgb[3] = {0,0,0};
        getRGB(hue, 255, 1, rgb);
        analogWrite(red, 255 - rgb[0]);
        analogWrite(green, 255 - rgb[1]);
        analogWrite(blue, 255 - rgb[2]);
    }
  }
}


void getRGB(int hue, int sat, int val, int colors[3]) {
    // hue: 0-359
    int r, g, b, base;

    if (sat == 0) {
        colors[0]=val;
        colors[1]=val;
        colors[2]=val;
    } else  {
        base = ((255 - sat) * val)>>8;
        switch(hue/60) {
            case 0:
                r = val;
                g = (((val-base)*hue)/60)+base;
                b = base;
                break;
            case 1:
                r = (((val-base)*(60-(hue%60)))/60)+base;
                g = val;
                b = base;
                break;
            case 2:
                r = base;
                g = val;
                b = (((val-base)*(hue%60))/60)+base;
                break;
            case 3:
                r = base;
                g = (((val-base)*(60-(hue%60)))/60)+base;
                b = val;
                break;
            case 4:
                r = (((val-base)*(hue%60))/60)+base;
                g = base;
                b = val;
                break;
            case 5:
                r = val;
                g = base;
                b = (((val-base)*(60-(hue%60)))/60)+base;
                break;
            default: //should never trigger
                r = 0;
                g = 0;
                b = 0;
        }
        colors[0]=r;
        colors[1]=g;
        colors[2]=b;
    }
}