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I would suggest a digital temperature sensor. They usually give a reading in degrees celsius. Examples are LM75 from National (I2C), DS18(B/S)20 from Maxim (1-wire) and SMT160 from Smartec (pulse width propotional to frequency).
These digital sensors don't need calibration, and they don't...
I used to run an old 16C84-04 at around 15MHz. I don't know the exact frequency, as I was using an RC oscillator. With an external crystal oscillator, out of spec. Vcc and maybe some cooling, things could have gotten impressive. I need to try that some day.
Anders M.
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