Alternative PCB to convert the NPKC 17 switch tester (https://www.massdrop.com/buy/npkc-switch-tester?mode=guest_open or https://www.massdrop.com/buy/npkc-17-switch-tester?mode=guest_open) into a number pad. It is small enough to be modified by the free version of EAGLE. You can buy the PCB through Dirty PCBs.
The Atmel ATmega32U2 microcontroller can be programmed with both TMK keyboard firmware and QMK keyboard firmware. TMK code for this PCB can be found here, while the QMK code (and a standard number pad firmware) is now available here.
As of September 08, 2020, the design is still untested.
Initial release. Included are all custom libraries for EAGLE.
Uploaded a tentative firmware made with the help of Keyboard Firmware Builder. Design still untested.
Remebered to add the link for people to buy the PCB. Design still untested (I'm off from the mechanical keyboards hobby for personal reasons).