This pin is on the rear of the ESP8266 module, and on many development boards, it isn’t even connected. ... In Circuit Programming is still my favorite, and you only need 4 pins (3.3V, TX, ...

It all started with wanting to program an ESP-12 variant of an ESP8266 module without involving any solder. Displeased with all the socket offerings on Thingiverse, [tweeto] set out to design their… ...