No schematic required. What makes the project work behind the scenes is some clever code-reuse by [Rotohammer] on the ESP8266 forums. Essentially, he wrapped the Arduino’s one-wire library ...

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. [Oscar] … ...