> Ok, if you have enough light to see the targets, you can always detect
> them
> using low cost cameras. By the way, you can use to detect and log ( if th=
e
> latter is needed).

I read down looking for the camera suggestion and was surprised to not
see it - but Rodolfo saved the day.

Canon A series camera until recently could be controlled using
software loaded on the SD card and written using the flexible powerful
and free
CHDK aka Canon Hack Development Kit.
http://chdk.wikia.com/wiki/CHDK

Every known and available feature of the cameras can be controlled
plus you can get them to do things outside their apparent specs.
You can write programs for the camera to run or set up various
boundary conditions including detecting movement within a predefined
area. The camera could deliver an image or just a trigge

Various builds and supported models
http://mighty-hoernsche.de/

Features
http://chdk.wikia.com/wiki/Features

NB:
   Motion detection - Trigger exposure in response to motion, fast
enough to catch lightning

Scripting - Control CHDK and camera features using ubasic and Lua
scripts. Enables time lapse, motion detection, advanced bracketing,
and much more. Many user-written scripts are available on the forum
and wiki.

USB remote - Simple DIY remote allows you to trigger exposures or scripts.

Manual:
http://chdk.wikia.com/wiki/CHDK_User_Manual

 More

  Russell McMahon
--=20
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