Thanks to Randy/N7EBB, we now have a Radio Interface Board that works with DigiPi. This includes a PTT circuit and status LEDs, in addition to a ps2 jack or TRRS connector, all on a single prefab board. You can buy the parts kit and solder it together yourself, or Randy will ship you a completed board at a very reasonable price for hammade equipment.

Radio Interface Board: https://n7ebb.org/
FEPi audio board: https://wb7fhc.com/ordernexusnow.html
Battery board: https://www.amazon.com/gp/product/B09...
DigiPi SD card image (patrons): https://digipi.org/
Patreon:   / km6lyw