#define RED 13
#define YELLOW 12
#define GREEN 11
#define LDR A0
void setup(){
  Serial.begin(9600);
  pinMode (RED, OUTPUT);
  pinMode (YELLOW,OUTPUT);
  pinMode (GREEN,OUTPUT);
  pinMode (LDR,INPUT);
  
}
int value,percent;

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