I want to experiment with motion detection on my A720 camera. I just installed the latest CHDK using cardtricks, and added Johan van Barel's script MotionDetect.bas.
My problem is that the script fails to shoot pictures on that camera. The program says "started", but it doesn't seem to proceed beyond the "shoot half" command. That is, the AF-assist beam keeps shining, and the camera does not shoot pictures.
For comparison I installed CHDK and MotionDetect.bas on an A540, and there it works fine. The AF-beam shines for just a second, and then the camera shoots a picture when triggered by motion.