• The circuitry on-board handles the background key-presses & LED lighting for the 4x 4 tile• Each tile has an I2C-controlled LED sequencer & keypad reader already on it• The chip controls all 16 LEDs individually• The connections are 'diode multiplexed'• Each LED is multiplexed with a constant-current driver, so you can mix & match any colors you like.• We would recommend our super bright LEDs Blue, Yellow, Red & White• Please click here to see the detailed tutorial guide• Please click here to see the Trellis Library Trellis is an open source backlight keypad driver system. It is easy to use, works with any 3mm LEDs & eight tiles can be tiled together on a shared I2C bus. This PCB is specially made to match the Adafruit 4x 4 elastomer keypad. Each Trellis PCB has 4x 4 pads & 4x 4 matching spots for 3mm LEDs. The circuitry on-board handles the background key-presses & LED lighting for the 4x 4 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 key press data & let it know when to light up LEDs as desired. Each tile has an I2C-controlled LED sequencer & keypad reader already on it. The chip can control all 16 LEDs individually, turning them on or off. It cannot do greyscale or dimming. The same chip also reads any key presses 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. The tiles have 3 address jumpers. You can tile up to 8 PCBs together (for a total of 4x 32 or 16x 8=128 buttons/leds) on a single I2C bus, as long as each one has a unique address. All the tiles connect by the edges with solder, & share the same power, ground, interrupt, & i 2c clock/data pins. So, you can easily set up to 128 LEDs & read up to 128 buttons using only 2 I2C wires! The tiles can be arranged in any configuration they want as long as each tile is connected to another with the 5 edge-fingers. Each LED is multiplexed with a constant-current driver, so you can mix & match any colours you like. You don't need it to be all blue, all red, etc. Mix it up!