This is I2C adapter for Graphic LCD 128x64, very suitable for interactive work with Arduino, Raspberry.
In this adapter used driver MCP23017. For instruction and libraries you can find information here: www.gammon.com.au/forum/?id=10940
For change I2C adress you can folow infromation on bottom side of board.
Control of backlight: Normal backlight use power 5V from +5V and can ajust with potentiometer. If you need control of backlight from microcontroller, pls cut-off connection of backlight on top side of board, and connect the Pin LED+ to any PWM out of microcontroller.
In set have male pin-headers for connecting adapter to Graphics LCD screen.