First world problem here: my driveway is over 200 meters long. It's windy, both left right and up down. I have no power at the street. I have no wifi coverage beyond about 20 yards from the house in the driveway direction. There are trees that completely block line of sight.
Does anyone know of a sensor that I could use to detect vehicles without setting up some sort of ridiculous mains-powered 10 unit Z-wave relay all along the driveway? It's worth it to me to have to add some sort of serial interface to read a non-Indigo compatible signal, but not worth it to run 200+meters of in ground AC power.
EDIT:
Found some RF driveway sensors with the kind of range I need. I'd be willing to hack together something from the chime circuit of one of these.
Has anyone done this? Is there another model you prefer?
Edit again: This one has a relay for "wiring external alarms"