I have spare sonoff mini and sonoff basic r2 switches.
Is there any safe way to connect it by 1/2 switches?
Or should I buy something else (esphome compatibile)?
I have to be sure that during power outtage (or reboot) the switch will not change it’s state - it will cut off garden irrigation during winter time.
Kind Regards
Maciek
Since the Sonoff Basic R2 devices do now have 2 pole switch contacts (ie: Normally open and normally closed) then there is no proper safe way to use ONLY once of those devices. The best solution (for safety) is to wire in a 2 pole relay to provide the N.O / N.C contacts.
Solid state relays??
They are not the ideal way to control your valve since these don’t have NC contact like normal relays. I’m not saying you can’t use them but you need to take care of the interlock on your code.
Also, some link or datasheet would be great, I’m not even sure they work at 3.3V trigger.