The 16u2 is normally used as the Arduino Uno’s USB interface. The only external hardware needed is a single 120 ohm resistor. The original Apples had cassette and speaker interfaces.

The LCD panel can be used with any Arduino-compatible board, so it can be useful in a whole host of projects. Stick around to see a simple demo of the board in use.

The hardware configuration described have been tested with an Arduino UNO R3, a 16×2 LCD, and an I2C LCD backpack purchased from an eBay seller. Further, the example sketch has been fully tested with ...