Using AUX pins as relays for CHDK

I'm confused and a bit frustrated, would appreciate any help as I'm not sure how to proceed.

Setup: I have a pixhawk autopilot running Arduplane 2.77, using Mission Planner 1.2.95

I've been following this guide to get my CHDK enabled camera working with my pixhawk. I'm interested in getting the camera triggering based on distance traveled.

Obviously the guide was written with APM in mind, so it needs to be adapted a bit for pixhawk; specifically the setting for RELAY_PIN. I've kept the rest of the settings the same as in the tutorial.

Pixhawk has 6 AUX ports according to the quick start guide, I am assuming that the numbers above the pins correspond to the AUX port numbering. When you mouse over the RELAY_PIN parameter, it says that pin 54 corresponds to Pixhawk FMU AUX1.

Tried setting RELAY_PIN to 54, no joy. Did a bit more looking, discovered in the release notes for 2.77:

"Improved relay code
The relay and servo set code has had a major overhaul, with up to 4 relays now supported for MAVLink control and much better support for the DO_SET_SERVO, DO_SET_RELAY, DO_REPEAT_SERVO and DO_REPEAT_RELAY MAVLink commands. Along with these changes is a new parameter BRD_PWM_COUNT which allows you to specify how many auxillary PWM outputs to enable, with the remaining outputs being available as digital relays. This allows you to re-assign some of the aux servo outputs on Pixhawk for use as relays, by setting the RELAY_PIN, RELAY_PIN2, RELAY_PIN3 and RELAY_PIN4 parameters. The pin numbers for these pins start at 50 for the first aux servo pin, and go to 55 on Pixhawk."

Additionally,I found this github issue about this same problem that states that the Pixhawk can't trigger CHDK because its relay pins operate at 3.3V instead of 5V.

So i suppose my specific questions are:

1) Is AUX1 pin 50 or 54?

2) Can anyone confirm that the relays, when working properly, won't be able to trigger CHDK?

Hi Guys .. Update

Ok this is mainly for Iskess, Waladi , etc

I have made some new cables they can be used for either Canon or Sony depending on the end pug you use .. as you can see on the attached photo .. these are inter changeable, So I will be sending units out this week So if you have not paid please send purchase amount $25 usd to me soon .. and your updated address, I know someone (Iskess) have paid already but did not receive from the first batch. due to postal issues, so I will be sending a replacement cable out FOC for him only.

Bad news .. I have to go back overseas again on the 19th to take care of family business:o( as most of you know from my last disappearance.. I will be gone another month plus a week or so ..

Good news is the new cable can also be used as an RC switch for Led lights, flour bombs or anything else you need to switch on and off. it has a 2 amp rating .. and uses the pixhawk 3v signal line to operate ..if you need to add voltage on the red wire .. you could use either 5v bec on the FC Aux pins or separate 12v line

Also please note this is not a commercial venture I am only making a few cables to help out fellow enthusiasts

Paypal to ziwi@eol.co.nz

Replies

- - - - Plinio Augusto > Brian Christal July 22, 2015 at 1:31pm
        
        Hi Brian,
        
        Sorry for my mistake. Now I realized that I must work to help KAP UAV Script come first with this technology.
      - Plinio Augusto > Brian Christal July 5, 2015 at 9:41pm
        
        Brian,
        
        The link to the beta version of the KAP UAV from chdk.setepontos.com is broken, you could provide the beta file?I would like to implement this function in 3DR_EAI_SX260.lua script ...
      - Plinio Augusto > Brian Christal July 5, 2015 at 8:08pm
        
        Exactly, I was reading now that the CHDK for IXUS 155 is not ready yet. Thank you for your answers you are helping me a lot. I will follow your way.
        
        Regards,
  - Plinio Augusto > Brian Christal June 4, 2015 at 2:17pm
    
    Thank you very much!
Reuben May 6, 2015 at 5:40pm

Ok .. new cables ready to ship.. I will be sending out this week so if you wanted one be quick otherwise I will be off the radar for a while..from next week ..

Cable $25 usd Postage $10 usd
Reuben May 5, 2015 at 9:51pm

Hi Guys .. Update

Ok this is mainly for Iskess, Waladi , etc

I have made some new cables they can be used for either Canon or Sony depending on the end pug you use .. as you can see on the attached photo .. these are inter changeable, So I will be sending units out this week So if you have not paid please send purchase amount $25 usd to me soon .. and your updated address, I know someone (Iskess) have paid already but did not receive from the first batch. due to postal issues, so I will be sending a replacement cable out FOC for him only.

Bad news .. I have to go back overseas again on the 19th to take care of family business:o( as most of you know from my last disappearance.. I will be gone another month plus a week or so ..

Good news is the new cable can also be used as an RC switch for Led lights, flour bombs or anything else you need to switch on and off. it has a 2 amp rating .. and uses the pixhawk 3v signal line to operate ..if you need to add voltage on the red wire .. you could use either 5v bec on the FC Aux pins or separate 12v line

Also please note this is not a commercial venture I am only making a few cables to help out fellow enthusiasts

Paypal to ziwi@eol.co.nz
- Waladi > Reuben May 6, 2015 at 2:12am
  
  Hi Reuben,
  
  Great cable!!
  
  Any chance you will publish the diagram and parts if any one required it?
  
  Btw: I send you pm.
  
  Thanks.
  
  Waladi
- iskess > Reuben May 5, 2015 at 10:19pm
  
  Thank you Reuben,
  Looks like you really refined this cable to have many uses.
  Looking forward to it.
  I wish you the best with your family difficulties.
SkySight April 29, 2015 at 1:46am

Hi members, Skysight MONO is now back in stock, Sony Multiport trigger solution! Visit www.skysigh.eu to learn more about this camera trigger. Have a great day guys!
Bill Isenberger April 19, 2015 at 6:20am

The Tuffwing cable works perfectly.

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Using AUX pins as relays for CHDK

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