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This is a 20x4 Arduino compatible LCD display module with high speed I2C interface. It is able to display 20x4 characters on two lines with white characters on blue background.
Generally,The LCD display will run out of Arduino pin resources. It needs 6 digital pins and 2 power pins for a LCD display.
This I2C 20x4 LCD display module is designed for the Arduino microcontroller. It uses I2C communication interface, With this I2C interface, only 2 lines (I2C) are required to display the information on any Arduino based projects. It will save at least 4 digital / analog pins on Arduino.