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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
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.

The tiles have 3 address jumpers. 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. All the tiles connect by the
edges with solder, and share the same power, ground, interrupt, and
i2c clock/data pins. 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.

Each LED is multiplexed with a constant-current driver, so you can
mix and match any colors you like. You don't need it to be all blue,
all red, etc. Mix it up! Any 3mm LED can be used, although we find
that diffused LEDs with 250mcd+ brightness look best.

This item is just for the Trellis driver PCB assembly: LEDs and
buttons not included. You'll probably want to pick up a matching
button pad and also some 3mm LEDs (we suggest red, blue or white which
look best). 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)


* Arduino library & example code on github. [1]
* Tutorial with wiring diagrams, installation instructions and
example code [2]



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General information

Manufacturer Adafruit
Product type Elektronikmodul
Item number5998531
Manufacturer no.ada-1616

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Warranty 24 month Bring-in

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