int light;
#define relay 7
void setup() {
  Serial.begin(9600);
  pinMode(relay, OUTPUT);

}

void loop() {
  light = analogRead(A1);
  Serial.println(light);
  delay(200);
  if(light > 500)
  {
    digitalWrite(relay, HIGH);
  }
  else
  {
    digitalWrite(relay, LOW);
  }

}