#define LDR A6
#define LED A3
int data;
void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  data = analogRead(LDR);
  Serial.print("LDR Data:   ");
  Serial.println(data);
  if (data<500)
  digitalWrite(LED,1);
  else
  digitalWrite(LED,0);
  delay(1000);

}