A script for handling USB Remote events on my Canon SD300 running CHDK

usbshot.bas

rem SETUP:
rem * Place in CHDK/SCRIPTS/ on your SD card
rem * Load the script in the Scripting Parameters
rem   menu and turn Enable Remote on in Remote Parameters
rem 
rem USAGE:
rem 1. Start the camera (and enable CHDK it doesn't autoload)
rem 2. Switch to record mode and disable the flash
rem 3. Switch to <ALT> mode and click Shoot to start the script
rem 4. The camera should shoot whenever USB power is detected.

title Remote button
  press "shoot_half"
  while 1
    wait_click 1
    if is_key "remote" then click "shoot_full"
  wend
end