Thermocouples are typically used to measure high temperatures, like exhaust gas temps. a JK thermocouple sells typically for about $10-$20. Thermistors and regular silicon diodes are better at the temps your talking about. You can even use a regular silicon transistor, and these all sell for pennies. these all change resistance with temperature, and the standard PC game port has four time-based resistance measuring elements in it, perfect for this. malcolm
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