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Portable Thermometer

The small circuit described here is very easy to use and consumes so little current that it will work for the battery's shelf life. The circuit uses a standard LM35DZ sensor whose analogue output voltage is buffered by an LM358. The voltage is read by the microcontroller and converted into a BCD value so it can appear on the multiplexed 7-segment displays.
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Extra info, Update

02 July 2008

the type number shown in the circuit diagram for IC5 should be: PIC16F684.

 

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