Does anyone have a good idea for monitoring if a wire is live 240v or not.
I'm wiring a PI relay in parallel with the room stats (8 stats in total) so that either the room stat or the relevant pi relay can call for heat.
That's all working nicely, but next I would like to monitor the status of the room stats (i.e are they calling for heat with the return wire at 240v)
Essentially a relay board where the control is 240v and it's switching a GPIO friendly 3.3v on/off
I'm struggling to google this as every result is for "normal" relays with LV controlling the mains.