I can now control the camera BUT it takes two pictures every time I give it 1 command to take a picture.
Is there any possible way to write metadata on a picture while/or after triggering it? Is the CHDK or a script capable of doing so?
It would be great if there was a way to geotag a picture when triggering it, using gps data from pixhawk or other flight controllers.
I believe communicating the coordinates would be possible even with a primitive one bit communication (5v or 0v)
but what about writing it?
That's probably the easiest part of what you propose. See these links :Write to EXIF data?TagMe, the Lua EXIF tagger
Some CHDK supported cameras include built-in GPS (e.g. S100) so there is no real work to do other than enabling it on the camera.
If you had a flight controller that can be a USB "master" then sending data in USB packets to a CHDK script is pretty trivial : ( read_usb_msg( ) ). However, it's not likely any commercially available flight controller will include USB master functionality.Otherwise, "bit banging" a serial message between the flight controller and camera is quite possible - assuming you have the ability to reprogram your flight controller and understand a bit about writing Lua scripts for CHDK.
Hmm I'm not sure what you mean by "master" functionality, the flight controller is capable of sending trigger commands (essentially 5v to cam), or is "master" something else?
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