This project will use the V-USB code to make a PC-connected hardware device. The heart of it all will be an ATTiny cpu, to which different sensors will be connected. To keep it cheap and simple, a ATTiny45 will be used. Alternatives are the Tiny25, altough it's limited memory wont allow many functions. Another is the Mega8, which gives us plenty of memory as well as many I/O-pins.