I don't want to be too specific because I'd like to hear new ideas! Here it is in general:
$100 in addition to what I already own, UNO, PC, Mifi router, ham radio, Canon 500D
Eyefi doesn't count in the budget because I can make use of that in other ways too, for example.
300m for starters. I've already got that working with CAT5 and EOS utility, so 200m would be less.
I've already made a circuit to use 110v cable to trigger the shutter no limit for distance.
I'd like to see a still image thru the lense, maybe every 5 minutes?
Thumbnail is only 30K jpg.
As a bonus, slow video and complete control of the camera using v2.0 of the PTP library.
Sorry to be so vague. I don't mind spending more if I can use it for another project!
I think I've decided what to do, I'm looking for another idea to beat it.
So far I have 2 possibilities to test. Passing USB data blindly from EOS utility over Xbee.
Or writing my own Arduino code to do one simple function first as v1.0:
Get a thumbnail jpg object from the camera.http://www.dankulp.com/ptpfs/
Again, I appreciate your effort!