This smart little interface board makes so easy to interface to any Graphic 128x64 LCD. The display has 20 pins and controlling it via the parallel bus takes up a lot of pins. With this I2C interface board, only 4 wires is required. 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.