Tired of having a computer with no sensors? We've created a parallax windows 7 sensor driver with source code so you can create your own!
The sensor device we made here is a Passive-Infrared Sensor. So basically it is a motion sensor. The board used in the white paper is the Parallax “BASIC Stamp HomeWork Board”. Sadly these only come in a 10-pack so the fallback would be the BASIC Stamp 2 Module ($49.00) and getting either the BASIC Stamp 2 Carrier Board” ($15.99) or the Board of Education Dev Board (USB) ($41.99).
The code example also has a .Net application that interprets the data from the sensor.