I have made several successful APM 1 aerial survey flights. (See http://diydrones.com/forum/topics/a-successful-apm-aerial-survey-mission)
I am now ready to do the same missions with APM 2 but APM 2 has no relay. From the APM 2 wiki page, "No relay. Very few people used this, so if you want one (to trigger a camera, for instance), we support adding one externally." How do we do that. There is no documentation showing how to control the pin marked, Camera Shutter. (See issue 512.)
I think that every aerial photographer, aerial mapper, and aerial photo survey application (both aircraft and 'copter) would make good use of the relay.
Camera roll stabilization would be a big help for aerial surveys. Can the Camera.pde from ArduCopter be added to AdruPlane? Can the UserCode.pde and UserVariables.h file be added to the ArduPlane release?
Thanks to the development team for the great APM 1 flight controller system.
I am looking forward to taking advantage of the improvements that APM 2 offers.