I'm developing a new product using sonoff.
I need to use the GND and GPIO 14 on the board to connect a micro switch.
This micro switch can keep the contacts exposed at some point.
I wonder if the 3.3V that the board uses to power the other components, are isolated from the main power supply (127/220VAC) and if by chance in case my user touches the micro switch, it will not run any danger.
You have seen the little tranformator on the print.
We with the tasmota firmware from github do this all the time.
Switches, sensors, and so on...
Thank you Mike