John sent in his build of a temperature probe for the OLPC. He purchased an OLPC through the Give 1 & Get 1 program, and was interested in the measure functions of the PC. I was too, when I had a chance to check one out a few months back.
The measure activity uses the internal audio system to measure a value input on the microphone socket. With nothing connected this application reads the value of the internal microphone and displays a waveform. You can have fun just by whistling, speaking or singing with Measure running.
Learn how to make your own temperature probe.
HOW TO – Run the OLPC (one laptop per child) on Windows