A relay is a programmable electrical switch, which can be controlled by Arduino or any micro-controller. It is used to programmatically control on/off the devices, which use the high voltage and/or high current. It is a bridge between Arduino and high voltage devices.

There are hundreds of tutorial available on how to use a "relay module" but I could not find a good one that shows how to use a Relay and not a Relay module. So, here we are to discuss how a relay works and how we can hook it up to an Arduino.

Mar 1, 2022 · In this tutorial, I will show you how to use a relay with Arduino and how relays work. By the end of this tutorial, you will have all the knowledge to interface relays with Arduino. This will be able to control motors, power switches and other high power applications.

Jan 15, 2019 · Controlling a relay module with the Arduino is as simple as controlling an output – you just need to send HIGH or LOW signals using an Arduino digital pin. With the relay module you can control almost any AC electronics appliances (not just lamps).

How to Control a Relay With Arduino: Relays are the best way to control your appliances as they have less resistance between their contacts and can be used in many cases like to turn ON and OFF AC (Alternating Current) appliances like Lights, TV, Lamps and many other appliances.

Dec 28, 2017 · So in this arduino relay control tutorial we will simply learn How to interface a Relay with Arduino. Here we are not using any Relay Driver IC like ULN2003 and will only use an NPN transistor to control relay. Relay is an electromagnetic switch, which is controlled by small current, and used to switch ON and OFF relatively much larger current.

Oct 15, 2023 · I will discuss how a relay works and how to control a relay using Arduino. At the end of this tutorial, I will make a small project using an Arduino, relay module, and PIR sensor that activates a light whenever motion is detected in a room.

Aug 7, 2023 · The Relay Module is a powerful component that enables your Arduino projects to control high-power devices, such as lights, motors, and appliances. It acts as an electrically controlled switch, allowing you to turn on and off external circuits with the help of low-power signals from the Arduino.

In this guide, we will learn to use a relay to turn an LED on and off. In this guide, a Little Bird Uno R3 board, the 5V 1-Channel relay board module is used. Please see parts list for a complete list of components required.

Jan 26, 2025 · A relay module is an electrically operated switch that allows low-power circuits like Arduino to control high-power devices. It uses an electromagnetic relay to switch on or off a device. Key Features of a Relay Module. Can control AC or DC devices. Optocoupler for isolation (on most modules).