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Slice of Relay

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Product Description

The Slice of Relay is a fully assembled add on board for the Raspberry Pi computer. It has 2 high power relays for switching external electrical circuits. The board plugs directly into the Pi’s 26 way GPIO header and is controlled by two I/O pins. The pins can be altered to any other if desired by removing the red jumpers and wiring elsewhere.

MAINS USE should NEVER be attempted by anyone unfamiliar, not competent and not qualified. The whole board including Pi should be enclosed in an isolated enclosure. We accept no responsibility for misuse at any voltage, including mains. MAINS CAN KILL!

If you need to expand your GPIO header to support another connection, there are a second row of holes which you can solder to.


  • 2 high power relays
  • 10 amp
  • Up to 250v AC (see safety warning)
  • Economical
  • LED indicators for both relays
  • Can be run from any GPIO pinOn board if desired




Length:         55.5 mm 
Width:            40.2 mm 
Depth:            26 mm
Weight:         42 grams maximum
Supply voltage:     5v relays / 3.3v I/O
Current no relay on:     0ma
Current 1 relay on:     71ma @ 5v
Current 2 relays on:    137ma @ 5v5



Really eay to use, see pdf for full details, here's the code needed for Python to turn on Relay A (simples!)

import wiringpi2 as wiringpi 

Slice of relay-v-0-1.pdf

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Product Reviews

  1. Great relay board 5 Star Review

    Posted by on 9th Aug 2016

    Fits in the pi, does the job, enables me to complete a pool control project

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