#define ldr A0

#define RLed A3
#define GLed A2
#define BLed A1

int ldRead;

void turnOnLed(int);

void setup() {
  Serial.begin(115200);
  // put your setup code here, to run once:

  pinMode(ldr, INPUT);
  pinMode(RLed, OUTPUT);
  pinMode(GLed, OUTPUT);
  pinMode(BLed, OUTPUT);

}

void loop() {

  ldRead = analogRead(ldr);  

  Serial.println(ldRead);

  delay(200);

  if(ldRead > 500){
    turnOnLed(255);
  }else{
     turnOnLed(0);
  }

}

void turnOnLed(int position){

   Serial.println(position);
   analogWrite(RLed, position);
   analogWrite(GLed, position);
   analogWrite(BLed, position);
}