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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. Each Trellis PCB has 4x4 pads and 4x4 matching spots for 3mm LEDs.
This item is just for the Trellis driver PCB assembly: LEDs and buttons not included.
You'll probably need the matching button pad, as well as some 3mm diffused LED's. Some soldering will is required for construction. The PCB doesn't contain a microcontroller so you'll also need an Arduino or similair to read the keypress data and let it know when to light up the LED's.
Need more than 4x4 buttons? No problem, the tiles have 3 address jumpers and you can tile up to 8 PCB's together on a single I2C bus, as long as each one has a unique address. That's up to 128 LED's and buttons using only 2 I2C wires!
For more information, check out Adafruit's Arduino library and example code and their tutorial with wiring diagrams, installation instructions and example code!