for instance Arduino, you would need atleast 6 I/O pins to talk to the LCD. However, if you use an LCD module with I2C interface, you only need 2 lines to process the display information. Now a days, ...

Put aside all of the projects that use an Arduino ... alarm system. The alarm can read RFID cards for activation and control of the device. It communicates with the front panel via an I2C bus ...