I'd like to set up my own parking sensor network in the area around my apartment. I have the wireless backhaul part of it sorted, but I need to figure out what to do about the sensors.
I've encountered some parking sensors, but I haven't ever stolen one off the street and taken it apart. The concept of operation, which is the same I intend to use, is to place one sensor for each parking space (yes, I'm going to deploy over a hundred of these things). Optimally, I can glue each unit inconspicuously to the side of the curb.
Does anyone have any idea what type of sensors I should be using to identify cars entering and exiting a space? I will share the sensor design and firmware, assuming we can identify how to do it. 