int LEDRED = 9;
int LEDYELLOW = 3;
int LEDGREEN = 10;
int LDR = 13;
int value = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(LEDRED, OUTPUT);
  pinMode(LEDYELLOW, OUTPUT);
  pinMode(LEDGREEN, OUTPUT);
  pinMode(LDR, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  value = digitalRead(LDR);
if(analogRead >= 50){
  digitalWrite(LEDGREEN, HIGH);
}
if(analogRead >= 50 ) {
  digitalWrite(LEDYELLOW, HIGH);

}
if(analogRead >= 50) {
  digitalWrite(LEDRED, HIGH);

}
  delay(1000);
  digitalWrite(LEDRED, LOW);
  digitalWrite(LEDYELLOW, LOW);
  digitalWrite(LEDGREEN, LOW);
}