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To share data with the user in your projects, an LCD module is just what you need. Robotpark 4x20 LCD I2C Module is a useful lcd module with 4 lines and 20 characters. The module has blue backlight and its contrast can be adjusted by using the potentiometer at the back.
This module has LCD-I2C converter and thanks to the converter, you can control Robotpark 4x20 LCD I2C Module with only two I2C pins of your Arduino or Arduino-like microcontroller board.
Connection Diagram and Example Code: http://www.dfrobot.com/wiki/index.php/I2C_TWI_LCD2004_(SKU:DFR0154)