As a final project for a course on Embedded Systems I decided to build a game using the Adafruit Trellis Keypad system and the Tessel. To do this elegantly, I wanted to create a library to hide the details of the I2C interface and expose a straightforward API with which to program.
I reverse engineered the Arduino library written by Adafruit and studied the datasheet for the main IC behind the Trellis system: the HT16K33 RAM-mapped LED driver. This project is a demonstration of the minimal hardware required to get the Tessel working with the Trellis Keypad.
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