This is a compilation of various projects for ESP8266 and ESP8266MOD. However, the code can run on most Arduino devices with minor modification. There are instructions in the the readme of each folder ...

The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .