https://www.adafruit.com/product/1616
Adafruit Trellis Monochrome Driver PCB for 4x4 Keypad & 3mm LEDs : Adafruit Industries, Unique &...
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...
3mm ledsadafruittrellismonochromedriver