Made to match the Adafruit 4x4 elastomer keypad Just Trellis Driver PCB Assembly - LEDs and buttons not included Arduino (or similar microcontroller) is required to control the Trellis Each tile has an I2C-controlled LED sequencer and keypad reader already on it Tile up to 8 PCBs together (for a total of 4x32 or 16x8=128 buttons/leds) on a single I2C bus