RPWMF.ino

#define Blue 9
#define Green 10
#define Red 11
#define MaxBrightness 75 //How bright it should get (0-255) Lower numbers mean faster cycling as well.
bool BlueIsOn = false;
bool GreenIsOn = false;
bool RedIsOn = false;
int BlueBrightness = 0;
int GreenBrightness = 0;
int RedBrightness = 0;

void setup() {
  pinMode(A0, INPUT);
  pinMode(Blue, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Red, OUTPUT);
  randomSeed(analogRead(A0));
  for(int i = 9; i <= 11; i++){
    on(i);
    delay(100);
    off(i);
    delay(100);
  }
}


void loop() { 
  on(random(Blue, Red + 1));
  delay(100);
  off(random(Blue, Red + 1));
  delay(100);
}

void onPWM(int pin, int brightness){
  for(int i = 0; i <= brightness; i++){
    analogWrite(pin, i);
    delay(10);
  }   
  switch(pin){
      case Blue:
        if(!BlueIsOn){ 
          BlueIsOn = true;
          BlueBrightness = brightness;
        }
        break;
      case Green:
        if(!GreenIsOn){
          GreenIsOn = true;
          GreenBrightness = brightness;
        }
        break;
      case Red:
        if(!RedIsOn){
          RedIsOn = true;
          RedBrightness = brightness;
        }
        break;
      default:
      break;
    }
}

void offPWM(int pin, int brightness){
  for(int i = brightness; i >= 0; i--){
    analogWrite(pin, i);
    delay(10);
  }    
  switch(pin){
      case Blue:
        if(BlueIsOn){ 
          BlueIsOn = false;
          BlueBrightness = 0;
        }
        break;
      case Green:
        if(GreenIsOn){
          GreenIsOn = false;
          GreenBrightness = 0;
        }
        break;
      case Red:
        if(RedIsOn){
          RedIsOn = false;
          RedBrightness = 0;
        }
        break;
      default:
      break;
    }
}

void on(int pin){
  int brightness = random(0, MaxBrightness);
  switch(pin){
    case Blue:
      if(!BlueIsOn){
        onPWM(pin, brightness);
      }
      break;
    case Green:
      if(!GreenIsOn){
        onPWM(pin, brightness);
      }
      break;
    case Red:
      if(!RedIsOn){
        onPWM(pin, brightness);
      }
      break;
    default:
    break;
  }
}

void off(int pin){
  switch(pin){
    case Blue:
      if(BlueIsOn){
        offPWM(pin, BlueBrightness);
      }
      break;
    case Green:
      if(GreenIsOn){
        offPWM(pin, GreenBrightness);
      }
      break;
    case Red:
      if(RedIsOn){
        offPWM(pin, RedBrightness);
      }
      break;
    default:
    break;
  }
}