Replies to This Discussion

Permalink Reply by Mike on January 5, 2013 at 5:25pm

Sorry Joe I don't completely understand your question?

I've got it running on my APM 2.5 now, the only thing I changed is that I use A7 and A8 (pins 61, 62) for focus and shoot. The distance calculation between two GPS locations is done through the function 'get_distance()', that function is also used for navigation.

Mike

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Permalink Reply by Jeff Taylor on January 6, 2013 at 1:28pm

Jerry, are you firing a camera running CHDK?

The problem I've had with using the servo command is that it only puts out PWM not solid 5V signals. I haven't tested it in a while but I think CHDK is unable to register anything when you send it PWM. As far as I remember I think it needed to be a 5V pulse on the order or 10ms before it recognized anything. 

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Permalink Reply by george on January 7, 2013 at 9:41pm

Same here. Need a logic signal to trigger my camera at specific waypoints.

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Permalink Reply by Mike on January 8, 2013 at 12:44am

The function 'verify_nav_wp()' lives in the commands_logic ArduPlane sketch. This code runs and verifies that a waypoint has been reached. You could add a flag in that function to trigger a 5V digital output on your APM board. It would run for every single waypoint during your mission though, until you add more code to choose specifically which waypoints you want.

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Permalink Reply by Dan Ho yesterday

Hi Mike, you seem to be very knowledgeable about the APM code and I was hoping you might be able to point me to a top-level flow diagram and explanation showing the overall code design.  Is there such a beast?

Thanks, Dan

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Permalink Reply by Mike 18 hours ago

Hey Dan,

I've only been reading through the main loop and chasing down the functions I want from there. I'd assume the dev team use state diagrams to keep track of the code but I don't know that they're available online. Maybe try contacting Andrew Tridgell for state or flow diagrams.

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Permalink Reply by Dan Ho 4 hours ago

That's a good idea Mike - I'll try Andrew.  Thanks

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