Alright, so I had some free time and I thought I'd comeback to this idea and get my geek on.
Coin for scale. But I will pack it into something a little larger later.
So far I am up to about $80 worth of hardware. I am using older model of Raspberry Pi (small, embedded computer). Newer version (if an older version ends up with a hole in it, lol) will drop the price to about $50... A camera module, battery pack; and USB WiFi card with somewhat of a high gain antenna. I am hoping to stretch it out to about 600m with current setup, as long as there's a line of sight between the rig and a phone or a tablet. If not, then power options will need to be tweaked, but I am told by folks much better than me at WiFizzz wizardry that it's definitely doable well beyond that range, with small tweaks. Will see how I go with this first.
Anyway, hardware is done. Camera is working. Now setting up WiFi access point to connect to, then some sort of nice little web interface and see how we go
Will this work, yes, 100%. Will this have the range I am after - most likely. Will this go to 1000m - probably with better battery pack and alternative wiring setup, which would add maybe $20 cost for a powered USB hub to provide dedicated power to WiFI card.
Will it highlight new holes on target - yet to be determined. Tested some thoughts, definitely works, but not in a pretty way I'd like it to be. But, doable and that's a start. Anyway, nice Friday/Saturday evening project.
Will keep you posted