The houses in Durban, South Africa (where I live) usually have some form of gap underneath them that ranges from 30cm to big enough to crawl inside. As far as I know it is for ventilation to help with the heat. The problem is that a bunch of squeaky rodents have decided that mine is a good home, and unfortunately the gap is pretty small so I can’t fit. So I decided to make a little car that could go scout out the area and show me what was going on under there, and possibly how to stop it.
So I built a little Bluetooth controlled car using a Netduino and a Windows Phone as a remote.