How to use LDR(light) sensor module using arduino




Materials:-
Diagram:-

Connections

LDR sesnor to Arduino
  • Sensor D0 pin = Arduino digital pin 7
  • Sensor GND pin = Arduino GND pin
  • Sensor VCC pin = Arduino 5v pin
LED to Arduino
  • LED VCC pin = Arduino digital pin 13
  • LED GND pin = Arduino GND pin
Code:-


//https://mrarduinoprojects.blogspot.com
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,HIGH);//turn on led
}else{digitalWrite(led,LOW);//turn off led
}
delay(500);

}