![]() We have an Arduino library & example code on github. Some soldering is required to put the LEDs into the PCB, and then attach wires that go from each Trellis to an Arduino microcontroller (or whatever microcontroller you prefer) You'll probably want to pick up a matching button pad and also some 3mm diffused LEDs (we suggest red, blue or white which look best). This item is just for the Trellis driver PCB assembly: LEDs and buttons not included. Mix it up! Any 3mm LED can be used, although we find that diffused LEDs with 250mcd+ brightness look best. You don't need it to be all blue, all red, etc. So, you can easily set up to 128 LEDs and 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.Įach LED is multiplexed with a constant-current driver, so you can mix and match any colors you like. Assignable Touch Bar, can be assigned to send Control Change message (hereinafter called the ‘CC’) or Pitch Bend Change message (hereinafter called the ‘Pitch’). All the tiles connect by the edges with solder, and share the same power, ground, interrupt, and i2c clock/data pins. AIR-Touch: Touch BarOctave Up and Down Touch Bar let you access the full MIDI keyboard range and Pitch and modulation deliver expressive, creative control. Press multiple keys at once to test for ghosting. Last key pressed none Keys that work show up in green Grey keys cannot be tested. You can tile up to 8 PCBs together (for a total of 4x32 or 16x8=128 buttons/leds) on a single I2C bus, as long as each one has a unique address. You can still press 86 keys Press all regular keys for an easter egg There is no difference between left and right Shift, Control, Alt, and Command or Windows. The connections are 'diode multiplexed' so you do not have to worry about "ghosting" when pressing multiple keys, each key is uniquely addressed. The same chip also reads any keypresses made with the rubber keypad. The chip can control all 16 LEDs individually, turning them on or off. 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.Įach tile has an I2C-controlled LED sequencer and keypad reader already on it. The circuitry on-board handles the background key-presses and LED lighting for the 4x4 tile. Each Trellis PCB has 4x4 pads and 4x4 matching spots for 3mm LEDs. This PCB is specially made to match the Adafruit 4x4 elastomer keypad. ![]() It is easy to use, works with any 3mm LEDs and eight tiles can be tiled together on a shared I2C bus. Trellis is an open source backlight keypad driver system.
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