Arduino AC voltage Control using 5v relay | Homemade 5v Single Chanel relay module

Overview

In this tutorial, we will learn how to control high voltage using a homemade relay with Arduino.

You can watch the following video below:-

Components Required

The required components list for this project given below:-

Arduino Uno

5V Relay Module

2 Pin Screw Connector

Bc547 Transistor

1N4007 Diode

PC817 Optocoupler

220-ohm Resistor

AC Bulb

Bulb Holder

LED

Veroboard

Some Jumper Wire

Relay Pinout

The pinout of the 5v relay has been given below:-

Fig: 5V Relay Pinout

Circuit Schematic

The circuit diagram of the relay interfacing with Arduino has been given below:-

Fig: 5V relay internal connection

Circuit Description

Fig: Arduino High Voltage control circuit

Source Code

The source code is given below:-

 int relayPin =13;  
   
 void setup() {  
  // initialize digital pin relayPin as an output.  
  pinMode(relayPin, OUTPUT);  
 }  
   
 // the loop function runs over and over again forever  
 void loop() {  
  digitalWrite(relayPin, HIGH);  // turn the LED on (HIGH is the voltage level)  
  delay(1000);            // wait for a second  
  digitalWrite(relayPin, LOW);  // turn the LED off by making the voltage LOW  
  delay(1000);            // wait for a second  
 }