I have an old Canon powershot S410 compact camera, which I want to use for a time-lapse project. For the project I will need to build an intervalometer to automatically shot photos (probably Arduino based).
CHDK is an obvious approach, but this camera is too old (pre digic II)
This camera does not have a normal remote shutter socket, but it does have a USB interface, and I have used Canon software to open the shutter via a windows PC. So I know the camera hardware can activate the shutter via the USB socket.
My question is what is the communication protocol the software used to activate the shutter?