Relay board for Raspberry Pi?

Hi,

I need to move about 10 relays off a Raspberry Pi for my home automation project. I can find easily ready made, inexpensive boards that will connect to anything at 5V, like an Arduino. But there doesn't seem to be much on offer for the Pi's 3V3 GPIO. My current best find is Adafruit's 3-to-5 and any 5V relay board off DX or so.

I am looking for a ready made board or ready to build kit, as compact as possible. Ideally powered off the 5V pin available on the Pi, but I can live with another P/S.

Any recommendations?

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jakabp over 8 years ago

You can directly connect these relay boards to the Raspberry Pi without glue logic: https://www.tindie.com/products/jap/8-channel-relay-board-for-raspberry-pi-and-arduino/

The I2C version is compatible with the Raspberry Pi's 3.3V logic and you can connect up to 8 boards to the same bus. The USB version is also suitable and code is provided to control multiple boards from the Raspberry Pi.
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Robert Peter Oakes over 8 years ago in reply to jakabp

Can you provide a view of the back of the board, I would like to see the clearances of the logic tracks from the mains tracks. I ask because your site claims use with 240V AC and 7odd amps. what would be nicer is a board layout view showing the tracks top and bottom so that the clearances can be seen.

I am not saying your board is un-safe or safe, I don't have enough information to judge. But I don't see CE or UL certification, and more importantly I did not obviously notice warnings about using / handling MAINS and using trained people to implement that part of any assembly.

So if you're confident of your design and board layouts, please share a close view. It will save a lot of grief from the Top Members as people have found in the past regarding MAINS Control based addons.
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Robert Peter Oakes over 8 years ago in reply to Robert Peter Oakes

BTW, the boards do look good and I like the mounting holes, plenty of them and a good size. but I would like to know more about them as stated above.
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jakabp over 8 years ago in reply to Robert Peter Oakes

Here is a quick shot of the bottom side.
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jakabp over 8 years ago in reply to Robert Peter Oakes

Here is a quick shot of the bottom side.
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Robert Peter Oakes over 8 years ago in reply to jakabp

Thanks for the fast response. I like the fact you have had additional routing around the mains common of the relays to increase the creepage allowance, certainly looks like your meeting or exceeding code there which is great, looks like all the logic lines are on the top side, would I be correct to assume there running down the middle of the board , I can not make out how close they come to the contact pins of the relays with the available pictures.

This is a good start to giving me the warm fuzzies though
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