#define LDR A0
#define RED 13
#define YELLOW 12
#define GREEN 11



void setup() {
  Serial.begin(9600);
  pinMode(LDR , INPUT);
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);

}

int value,percent;

void loop() {
  value = analogRead(LDR);
  value = 1023 - value;
  percent = map(value,0,1023,0,100);
  Serial.println(percent);
  if(percent >= 66) {
    digitalWrite(GREEN,HIGH);
  }else {
    if(percent >= 33){
      digitalWrite(YELLOW, HIGH);
    }else{
      digitalWrite(RED, HIGH);
    }
  }
  digitalWrite(GREEN, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, LOW);
  

}