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CHDK usb trigger

Posted by Kevin Christensen on July 8, 2015 at 6:23am

Hi,


I have a Canon S100 with CHDK, the E-flite EFLA600, Sparkfun step-up board and this cable http://www.kapshop.com/p274/Canon-11-pin-for-CHDK/SDM-and-Video-out/product_info.html

I have soldered and connected to Pixhawk. I can measure 3.3v pulses from the output pins of the Pixhawk.

The camera will fire when I disconnect the main Lipo battery. But I can’t get it to fire from Mission Planner.

Any idea how I can troubleshoot this?

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Replies

    • Pat Randall > ausdroid August 5, 2015 at 7:14am

      Thanks for jumping to help, it is a bit confusing.  I have a 3DR X8+ that I am preparing for surveys,  Just got the Canon S100 mounted and did some flights using CHDK and the time lapse setting, but need the trigger.  I sent a friend request so I can PM about testing your cable.

      Thanks

    • DavidFolts > ausdroid August 4, 2015 at 9:47pm

      Nice piece of kit guys

  • Ryan Watkins August 4, 2015 at 7:22pm

    Hi Kevin

    I ran into the same issue this spring trying to fire an ELPH 300HS powershot. The eflite board doesn't do crap.For some reason it doesn't pass the signal through. Instead, you have to make your own firing circuit using an IC inverter chip. I will find the exact part number tommorrow, but basically, I fed a 5v line from the pixhawk into the 5v on the IC and set it up so that when I sent the IC a 3.3v pulse from the pixhawk, it sensed that and fired a 5v pulse to the camera.

    Hope this helps, it is so gratifying when the first mapping flight is done and when you check the card there are actually pictures :)

    Ryan

  • T3
    Thorsten August 3, 2015 at 2:56pm

    As suggested by Martin: have a look at the Pixhawk-CHDK discussion.

    I just posted some pictures how to build a cable.

  • Martin July 30, 2015 at 4:29am

    http://diydrones.com/forum/topics/using-aux-pins-as-relays-for-chdk...

    Build one of those schematics.

  • T3
    Stephen Zidek July 9, 2015 at 8:05am

    Why are you using the E-flite?  I just use Aux 6 on the pixhawk as a relay. It puts out 3.3v for 0.1 seconds, and the step up supplied by 3DR for connecting to the S100 bumps it up to 5v.  I have no idea if the sparkfun board can be used this way.

    • David > Stephen Zidek July 24, 2015 at 10:01am

      @Stephen

      Does 3DR sell this cable for the s100 separate from its mapping kit?

      • Kevin Christensen > David July 29, 2015 at 4:52am

        I can confirm it is not working.

        I can measure 3.3v from the aux pins on the Pixhawk but when soldered to the step up board I can only measure 0.1v going in.
        The sparkfun will output 3.6v to CHDK but that is not enough to trigger.....

        Any idea how I can get this working with the parts I have? Sorry, I'm an idiot when it comes to this.
        Or alternatively buy an off the shelf cable? 3DR does not sell it separate.

        • Walter Wing > Kevin Christensen July 29, 2015 at 8:26pm

          I don't think there is anything you can do to make that Sparkfun board give a nice clean 5V output.

          This might help if you what a commercial solution : PixHawk Camera Trigger Cable  (scrol down to the PixHawk Camera Trigger Cable)

          TuffWing Store
          TuffWing Accessories
    • Walter Wing > Stephen Zidek July 23, 2015 at 5:55pm

      I do not think that sparkfun board is likely to work. It needs to draw more current from the 3.3v output of the pixhawk than the pixhawk can source.  So the output will not go to 5V when the pixhawk tried to "shoot".


      I have not tried it but something like this should work better : https://www.sparkfun.com/products/12009 

      SparkFun Logic Level Converter - Bi-Directional
      The SparkFun bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same tim…
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