Thanks for the reply, I did have my doubts about mains voltage with these boards given the fact so much is crammed in to such a small space. Not sure if there's a practical solution, maybe switching 12v with the onboard relays and using that 12v to trigger other relays mounted off the board, messy a...

Can anyone recommend a reliable 16 channel (at least) opto isolated relay board for my Pi 3. I bought a XCSOURCE 16 Channel, only had it in operation a couple of weeks, and it's only switching a fairly light load a couple of times a day. I've now got 2 of the outputs stuck 'on', there's no LED indic...

I'm new to all this stuff so I'll explain what I want. I keep Snakes/Reptiles and I'm about to re-wire my reptile room, and am thinking of using a Pi or Arduino to control the room lights, switch the thermostats on and off, control a fan, an Insectecutor, and to control the brightness of the LED lig...