NEW VERSION WITH NEOPIXELS July 17, 2019 – https://www.thingiverse.com/thing:3750704
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.
Enclosure design features ports for USB and power. Bottom cover includes mounting holes for Arduino board. The tray piece holes the trellis driver PCB into place, allowing enough room for jumper wires. Snap tolerances are optimized for PLA, but should also work for ABS and SLS.
Great for MIDI instruments, drum sequencers, puzzle games and more!