Flash Tasmota firmware to a Sonoff S31 Smart Monitoring Outlet using an Arduino Nano
DO NOT CONNECT THE SWITCH TO AC POWER AT ANY POINT THE CASE IS OPEN. Bridge the Nano's GND and Reset pins. The TX/RX pins don't need to be swapped. NanoS31 3.3VVCC RXRX TXTX GNDGND Hold the button on the side, plug it into the computer...