Datasheet

The Trellis PCB is specially made to match the Adafruit 4x4 elastomer keypad. Each Trellis PCB has 4x4 pads and 4x4

matching spots for 3mm LEDs. The circuitry on-board handles the background key-presses and LED lighting for the

4x4 tile. However, it does not have any microcontroller or other 'brains' - an Arduino (or similar microcontroller) is

required to control the Trellis to read the keypress data and let it know when to light up LEDs as desired.

Each tile has an I2C-controlled LED sequencer and keypad reader already on it. The chip can control all 16 LEDs

individually, turning them on or off. It cannot do grayscale or dimming. The same chip also reads any keypresses made

with the rubber keypad. The connections are 'diode multiplexed' so you do not have to worry about "ghosting" when

pressing multiple keys, each key is uniquely addressed.