int led = 8;

int ldr = A0;

void setup() {

  // put your setup code here, to run once:

pinMode(led,OUTPUT);

pinMode(ldr,INPUT);

Serial.begin(9600);

}

void loop() {

  // put your main code here, to run repeatedly:

int readings= analogRead(ldr);

Serial.println(readings);

if (readings <= 200){

  digitalWrite(led,HIGH);

delay(50);

}

if (readings >= 500){

  digitalWrite(led,LOW);

delay(10);

}

Serial.println(readings);

}