How to Control 220V Light Bulb from 5V Arduino using a Relay

In this tutorial, you will learn how to control a 220V light bulb from 5V Arduino using a relay.

Parts Required

• Arduino
• Relay
• Jumper wires
• Light Bulb
• Breadboard

Circuit

Code

void setup() {
 pinMode(2, OUTPUT);
}

void loop() {
 digitalWrite(2, HIGH);
 delay(2000); 
 digitalWrite(2, LOW); 
 delay(2000);
}

The code shown will turn the light on and off at 2-second intervals, if you want to put a button to control it just add a digital input.

References

[1] https://forum.arduino.cc/t/arduino-hangs-when-connecting-220v-to-relay-board/609411