invisiblek

compiled Sonoff-Tasmota from https://github.com/arendst/Sonoff-Tasmota.git (read directions there) and save the .bin somewhere easy to get to

rip the chip off your arduino, you're going to use that bish as an ftdi adapter

wire it up like this:

arduino     sonoff pins
3.3v        pin 1
RX          pin 2
TX          pin 3