#define LDR 3
#define LED 4
void setup() {
  // put your setup code here, to run once:
  pinMode(LDR, INPUT);
  pinMode(LED, OUTPUT);
  
}

void loop() {

if (digitalRead(LDR) == 1)
digitalWrite(LED, 1);
else 
digitalWrite(LED, 0);
delay(1);

  
  
}