Hi Dave & Bruce,

I see that the shield dim PDF from me. Ik will take a look for a physical PCB layout.

I think, Microchip get never so much ground in the open source like the Arduino. The Arduino is world famous and very very popular by hobbist, education, profs etc.

But, it will be nice that some shields be compatible.

Good luck, Bruce with the RF shield.

/ Gevo