A simplified version of the BKM-129X compatible board.
Should be able to be created at $25-30, with the ADG1611 being the most expensive component.
This requires an Arduino Nano v3 loaded with the BKM-129X-MCU code from https://github.com/skumlos/bkm-129x-mcu
For now only tested on a PVM-9L2.
For more information go to https://immerhax.com/?p=422
You are welcome to clone, produce and sell hardware based on this. Please keep changes and so on open source.
Cool kids give credit where due.
(2020) Martin Hejnfelt (martin@hejnfelt.com)