How to control 230V bulb using LDR sensor module with 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
Relay to Arduino
  • Relay VCC pin = Arduino 5v
  • Relay GND pin = Arduino GND 
  • Relay IN2 pin = Arduino D13 pin
Code:-

const int ldr = 7;
const int light = 13;

 void setup() {
  pinMode(ldr,INPUT);//define pin as input sensor
  pinMode(light,OUTPUT);//define pin as output sensor


 }

 void loop() {
int y =digitalRead(ldr);//read the sensor
if (y==1){
  digitalWrite(light,HIGH);//turn on led
}else{digitalWrite(light,LOW);//turn off led
}
delay(50);

 }