CODE
const int ldr = 7;
const int led = 13;
void setup() {
pinMode(ldr,INPUT);//define pin as input sensor
pinMode(led,OUTPUT);//define pin as output sensor
}
void loop() {
int y =digitalRead(ldr);//read the sensor
if (y==1){
digitalWrite(led,LOW);//turn on led
}else{digitalWrite(led,HIGH);//turn off led
}
delay(500)
}