An LCD display that can display a max of 16x2 charactors. with the help of the I2C bus convertor and related libraried, you can easily use this module with just 2 wires. You can find the usage here:


Backlight control and Contrast control

The Backlight can be controlled by the firmware or the on-board jumper: Firmware:
 lcd.backlight();// light on the backlight;
 lcd.noBacklight();//light off the backligth;
Hardware: There is a jumper on the board, if you take away this jumper , the backlight will aways be off, and you can also control the LCD contrast by adjust the on-board potentiometer.


Arduino library: LiquidCrystal_I2C


Arduino: Raspberry Pi: