esp8166_i2c_24xx16 This code is still untested Installation cd driver/ git clone https://github.com/zarya/esp8266_i2c_24xx16.git i2c_24xx16 Add #include "i2c_24xx16/i2c_24xx16.h" to your code Add driver/i2c_24xx16 to the MODULES line in the makefile