Today I was flashing the custom ESPHome firmware to my Sonoff MINI R2 and after this job was done I tried out of curiosity to connect this small device to low DC voltage and miraculously it was working.
I tested both 24V and 12V DC. Sadly in case of 12V it behaves strangely. After voltage is applied it connects to WiFi but after switching the relay (from HA or with PINs) whole device restart it self and relay turns off. But for the 24V DC it works without any problem!
Nice for everyone who wants to use 24V DC as a secondary wiring for IoT devices and lights!
@rknobbe No, I don’t have any 24V AC power source. But you can try and potentially use AC/DC buck convertor if the 24V AC is not suitable for little Mini R2