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, ...

[Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order to gain ... Our guess it that an SPI / I2C IO extender could lift ...

The build uses an Arduino Uno to drive a simple HD44780 LCD display with 16 characters each ... passes them to the Arduino Uno over I2C, and then the Uno shuttles the message to the display.