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...
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?
Ok. So it was a combination of things. For my canon s110 I formatted the SD card using camera's tool menu for low level formatting (fat32) at 8 GB. Set up card using Method 2: http://chdk.wikia.com/wiki/Prepare_your_SD_card. Had to make sure the camera's firmware and CHDK version matched. Also had to use the full version of the CHDK (attached). Pixhawk was set up as: http://www.tuffwing.com/support/pixhawk_camera_trigger_cable.html I used the tuffwing cable.
Attach a servo to the output - see if it moves in servo mode.
For some reason, a lot of people have found that cables work when you have set trigger to "relay" instead of "servo"