Thanks to @allObjects
2 Relay Board Module
SainSmart 2-Channel Relay Module
Hi - I'm not quite sure what you're saying here? Those relay modules (there's a bit of info on http://www.espruino.com/Relays as well) have optocouplers in them already - so if you use those then things are already isolated.
@Gordon, it is giving one of the core subjects of conversation with the title
Turning my computer on and off with a Pico, Wiznet 5500 and a relay its own conversation and title to support community members with more generic topics. Thanks @Robin.
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