I've been investigating the rfPIC12F675K over the last couple of days and have come up with preliminary transmitter design based on Microchips appnotes (learning Eagle). This is targeted as a board replacement for the ebay trigger, however I'm in two minds on this chip.
Anyway the schematic can be found here
http://blog.everythingrobotics.com/wp-content/uploads/2007/10/strobejnr.pdf
Pros:
- Can run in FSK or ASK (schem: I have it running in FSK)
- Minimal component count.
Cons:
- Transmitter only.
- We would probably need to use their Receiver chip, but from the spec sheet there is a lot of additional discrete components that are required for the receiver. (I'm no radio Engineer, but I'm sure you guys could comment) then we still need a processor after the receiver.
- The Tx and Rx would need to be tuned.
I'm starting to lean towards a non RF Pic Chip with enough I/O and some flash memory for easy upgrades (i.e. no RF) and a seperate RF module, such as these http://www.hoperf.com/rf_fsk.asp that could be used in both senarios, i.e. ebay trigger replacement using PIC and a Pocket wizard replacement using ARM7, just the processors would be different, but the wireless modules are the same.
Also they have different wireless modules covering different bands that are pin compatible so they could be a drop in replacement.