Adafruit Trellis Monochrome Driver PCB for 4x4 Keypad & 3mm LEDs

Key Features Made to match the Adafruit 4x4 elastomer keypad Just Trellis Driver PCB Assembly - LEDs and buttons not included Each tile has an I2C-controlled LED sequencer and keypad reader already on it Arduino (or similar microcontroller) is required to control the Trellis Tile up to 8 PCBs together (for a total of 4x32 or 16x8=128 buttons/leds) on a single I2C bus This item is just for the Trellis driver PCB assembly: LEDs and buttons not included. Trellis is an open source backlight keypad driver system. It is easy to use, works with any 3mm LEDs and eight tiles can be tiled together on a shared I2C bus.This 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 k