A PIC-Based Temperature Alarm

Nik Zuraifah , Nik Mohamed (2007) A PIC-Based Temperature Alarm. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This simple temperature alarm is developed which uses a small mid-range PIC16F84 microcontroller and a 2-line LCD display. The alarm displays current temperature in both Celsius and Fahrenheit degrees and features a 3-key keypad which allows the user to set independent high and low temperature alarm points. The alarm also records the minimwn and maximwn temperatures encountered. Development ofthe project is straightforward and was done without the aid of a debugger since the 16F84 processor chosen does not support the use of an in-circuit debugger. Although crash and btirq development can be used (in which case changes are made, new code is burned into the chip, and the results observed before changes are made again for the next cycle). To ease development either a 16F876 can be used (this is a 28 pin chip which supports the use of the inexpensive lCD debugging tool) or an emulator can be used. Important design issues illustrated in this example include basic analog interfacing, use of tables to convert data, computer generation of table data, and use of an LCD display to display data.

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