#define LDR 2
#define RLED 3
void setup() {
  Serial.begin(9600);
  pinMode (LDR ,INPUT );
  pinMode (RLED ,OUTPUT );
  // put your setup code here, to run once:

}

void loop() {
  int value=analogRead(LDR);
  Serial.print("LDR:");
  Serial.println(value);
  
    if (value < 1000)
    {
      digitalWrite(RLED ,HIGH  );
    }
    else 
    {
      digitalWrite(RLED ,LOW );
    }
  }
  // put your main code here, to run repeatedly: