On my hexacopter drone, I have setup my digital camera so that I can see live video from it through my FPV while flying. On my receiver, I have two channels left and want to be able to remotely take pictures and zoom in and out while flying, all from my Turnigy 9x Transmitter.
I watched a YouTube video about how to setup the camera to remotely trigger from the transmitter using a Turnigy remote controlled switch. Now I need to figure out the zoom in and out function.
Reading (http://chdk.wikia.com/wiki/USB_Remote), I found that the when USB remote is enabled, CHDK is set up so that: 1 pulse = zoom in one step, 2 pulses = zoom out one step, and 3 pulses = shoot.
Assuming its possible to be able to change, 1 pulse = shoot, and the other two functions I want to use are triggered at 2 and 3 pulses, how can I connect this to my receiver so that my Turnigy 9x transmitter so that I can zoom it in and out using a turn knob switch? Would I need a programmable chip that would give the camera correct number of pulses based on the Transmitter's outputs or can the remote do that by itself? If so how would I go about programming that?
Since the camera only has one USB output, I figured that I could wire both the remote shutter switch and zoom in/out function in parallel to the camera, since only one function would be used at a time, or am I wrong here?