Wemos D1 mini
From CoMakingSpace Wiki
The Wemos D1 mini is a low-cost microcontroller PCB featuring an ESP8266.
It uses a [USB_Serial_Converter#CH340|CH340 USB serial converter].
Bootup GPIO state
D0 | D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8 | A0 | RX | TX |
LOW | LOW | LOW | HIGH | HIGH | LOW | LOW | LOW | LOW | LOW | HIGH | HIGH |