Connect with PJON an ESP8266 to an Arduino Uno with a single wire
Usage example a PJON to connect to an ESP8266 to n Arduino compatible boards using only one pin for communication.
If you are connecting an ESP8266 to a 5v bus you need to add some complexity to the standard PJON wiring. Logic level converter usage is strongly suggested. You risk to fry ESP8266 pins and to have communication problems due to logic 1 treshold of 5v boards. Here you can find a fritzing project made by aperepel: http://fritzing.org/projects/pjon-with-uno-and-esp8266nodemcu