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Measuring Temperature with the
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2010-05-20
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Almost all temperature sensor circuits use some form
of discrete component (such as a thermistor or a solidstate
sensor) to actually measure the environment’s
temperature. It is left to the microcontroller to interpret
the reading into a human-friendly form for the user’s
benefit.
It is possible, however, to design a digital thermometer
without an external sensor, by using a temperature
sensitive property of the microcontroller itself. This
Application Note shows how to use the Watchdog
Timer (WDT) of a PICmicro® microcontroller for temperature
measurement.
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