That'd be super! Thanks already!
#define CAM_NEED_SET_ZOOM_DELAY 1 #define CAM_USE_ALT_PT_MoveOpticalZoomAt 1
#define CAM_USE_ALT_SET_ZOOM_POINT 1
The schematic in the picture shows a connection which lights up a LED; I imagine I can use the very same connection to send +5V to the USB port for 500 msec.
The only thing I am not sure about is this: do I need a pull-down resistor in the ground wire coming from the USB, and if yes, what size?
The switch here will be mechanically pressed by the film gate as it moves horizontally. Ideally it'd then trigger the camera as fast as possible. It's an Ixus 55, so what settings should I use on it? AF lock and zoom lock anyway?
And finally - is it possible to use CHDK to save images directly on the computer? I am running against a file system limitation, as the 55 can only have a 4GB card, but movies have more than 5,500 frames, resulting in at least 6GB. Saving on computer would be ideal.
The four terminal thingy is the pushbutton element on 123Circuits.io, which is an online Arduino simulator. I plan to use just a microswitch with a lid. I will test it tomorrow, especially if I don't need a resistor.
I can't tell how you plan to connect the USB port on the camera to the Arduino based on what you have posted so far. Can you give us a diagram (either CAD or a hand drawn sketch scanned or photographed) ?
If the idea is to save images directly to PC, probably it would be better to connect camera to PC and control it using chdkptp. The function of the arduino is to move the film, and to send command to PC to inform that film is at right position. The PC receives the signal from Arduino, sends the remote shoot command to camera using chdkptp and saves the images to hard disk.
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