A lot of people have used ESP8266 to add inexpensive WiFi connectivity to their projects, but [Oscar] decided to take it one step further and program an Arduino over WiFi with the ESP8266.

The various development boards such as the NodeMCU or Wemos D1 make working with the ESP8266 an absolute breeze ... [Ryan] came up with a slick 3D printed programming jig that uses pogo pins.