How to Use a Relay with a Raspberry Pi

Add an electrically-operated switch to your Pi!
Tyler Tyler (291)
20 minutes

A relay is an electrically-operated switch. These switches can be extremely useful for a variety of Raspberry Pi projects (think turning on a light or opening your garage door. Watch the video below to learn how to drive a relay using your Raspberry Pi.

Raspberry PiRaspberry Pi ×1
SainSmart 2-channel Relay Module ×1

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The following video will show you how to wire up the relay to your Raspberry Pi.

Watch the video:

Here's a copy of the test script used in the video:

#!/usr/bin/env python

import time

import RPi.GPIO as GPIO

GPIO.setup(17, GPIO.OUT)
GPIO.output(17, GPIO.LOW)


GPIO.output(17, GPIO.HIGH)

To run the script, simply copy the code above to a file on your Raspberry Pi called (or whatever you want). And then run the script using:

Tiny boards, big differences.
Ash Ash (332)

The Raspberry Pi Pico and Raspberries Pi Zero are miles apart when it comes to specs, form factor, and software support.