All

Appreciate the points you've made. I canceled my order and it was refunded by the sensor company. You're right, it doesn't make any sense with a single sensor. I just need to order the Raspberry Pi and start down that road.

I'm intrigued. I've been watching this thread for awhile and registered to see how this all works out. It's cheap enough that I ordered sensors, too, but there's definitely a 'too good to be true' vibe. It'd be interesting to compare to one of the existing systems out there. I'm interested in trying one of the homebrew Raspberry Pi setups...