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  • I'd say the Seeed one looks good - they have a WiFi page on it here: http://wiki.seeedstudio.com/Relay_Shield­_v3/

    Where it mentions that it works fine on 3.3v Arduino boards.

    There also seem to be a load of relay shields in that kind of layout/form factor - eg this one on eBay that look promising. I've ordered one to check it out - it's possible their little transistor circuit works in such a way that it tries to put 5v on Pixl.js's IO pins (which wouldn't be good news), but if they're sensible it should be fine.

    If you can find any example code and sending a 1 turns the relay on then you should be fine.

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