During this day I have two problems with two Sonoff mini. I am not sure, maybe the device has a incoming voltage ib S1 or S2 input, probably but not sure. I connect an active thermostat at S1 S2 that seems not work because this is not a real switch. For some minutes Sonoff works as a switch (but thermostat doesn't work actually)
Less than an hour later Sonoff mini has led off and it looks that it is dead.
Maybe someone knows how to get alive the devices or what to do