CBDB
Mailbag – 4×4 Matrix Keyboard for ESP8266 nEXT EVO Board
This Mailbag can also be seen as Part 4 of the ESP8266 nEXT EVO Analog Extension Board (AN1) In this part we will continue talking about the ESP8266 nEXT Evo 8 Bit I/O Expansion Port based on the PCF8574 chip from NXP, testing procedures and software programming for the AN1 Read more…