Hey Dave,
Just use the PBP PULSOUT, low idle, high pulse, as specified above, to turn the cam on/off.
Not sure about the need to send the pulse every 20ms. The unit might tolerate longer periods between pulse as most servos do…but that’s easy enough with DT’s int’s.
Incidentally, I used one of those keyfob cameras for the same thing as the FlyCam, but started/stopped the recording while on the ground with the buttons. I cracked the case open a couple weeks ago. Wouldn’t be too hard to add in a 12Fxxx to replicate the button presses as required.
(sigh)…more toys…