About the article

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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