We can infer quite a bit from the scorched board — first ... As usual, I went with an ESP8266 of the Wemos Mini D1 variety, running NodeMCU. The firmware is very standard this time — the ...

[Sebastian] is using a NodeMCU but suggests that it could be pared down to any ESP8266 board — with similar cuts made to the rest of the electronics — but has this working as a proof of concept.