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5V Relays Tutorial with Arduino

LESSON 15: Relays & Transistors

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The pins from the Arduino can power a variety of components up to 5V but anything requiring more voltage or current can damage the Arduino if you try to hook it up directly. To incorporate higher power devices like fans, lights, motors, heaters and other household appliances into your projects you’re going to need a 5V relay. The Arduino can be programmed to turn on the relay (which then powers your larger device) when a certain event occurs.


You’ll be able to follow along and build all the projects featured in this course with the ELEGOO UNO Project Super Starter Kit.


  1. Introduction to stand-alone 5V relays and how transistors work
  2. Connecting a transistor and relay to your circuit
  3. Controlling multiple LEDs from 1 pin with a transistor
  4. Controlling a household light bulb with a 5V relay and Arduino
  5. Controlling a motor with a 5V relay
  6. Controlling a 5V relay with an IR remote control
  7. Assignment



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