This is a bit of a strange one. I am in a property where I can't interfere with the boiler or have anyone interfere with it for me and would like to fit my Netatmo relay. There is a basic control panel on the front of the boiler I plan on controlling via a couple of solenoids (temp up / down) based on input from the Netatmo thermostat / output from its wireless relay. My worry is at the Arduino side - I assume there is some voltage danger to the Arduino if wired directly to the output of the relay.
Is this correct? What would the best approach to this be?
Thanks for reading.