I need to use my RPi to control a relay which switches on/off an electrical circuit.

I got a relay board but it seems that works only when used at 5V.

I'm a noob so please go a bit easy on me.:P

What relay boards are available which work on 3.3V or what other methods can I use to get this to work?

  • 1
    Liable to be closed for shopping question... off limits per the FAQ. You should be able to reword it to work though... A quick google should turn up something though...
    – Butters
    Jun 23 '13 at 5:50
  • Do you have the schematic? It can probably be made to work Jun 23 '13 at 10:02
  • Just use a normal transistor connected to the 5V line to switch the relay. See e.g. susa.net/wordpress/2012/06/raspberry-pi-relay-using-gpio
    – Gerben
    Jun 23 '13 at 10:47

I am also a RasPi newcomer, but:

I had a similar issue myself connecting a 5V RF receiver to the RasPi's 3.3V GPIO input and I was helped in the Adafruit Industries forums.

Adafruit sells logic-level converters from 5V to 3.3V, they might help you.


Quite an old question but if anyone is looking for the same thing here's an answer.

Use a transistor to switch your relay on/off. Make a search in Google on "Transistor switch relay".

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