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±??μí3ò?AT89S52μ￥???ú?a?÷??D???￡?ía?§??ò?3???μ??·?￠??ê?μ??·?￠±¨?ˉμ??·?￠?ü?ìμ??·μè113é???@@????μí3μ??·°?￡?′ó??êμ??×??ˉ3????μí3μ??÷??????1|?ü?￡?éò??μ,′?éè???ùíê3éμ?μ?×ó3óoü′ó3ì?èé??ú×?á?ó|ó?Dè?ó?￡

1??ü′ê μ￥???ú￡?3???′??D?÷￡?A/D×a???÷￡?LCD??ê??÷
THE ELECTRONIC SCALE DESIGN BASED ON MICROCONTROLLER

ABSTRACT

With the application of micro-electronics technology, tradition ponderation instrument used in market has been not satisfaction with hunman requirements already. In order to make up for the traditional apparatus shortcoming, we improve the apparatus's control system with intelligence and automation. This system is mainly controlled by microcontroller, the section of height measurement accomplish by supersonic sensor, the section of weight measurement accomplish by weight sensor and A/D transformer, this apparatus have many characteristic such as having more function, consume less energy, small and move easily, low price, measure precisely, the speed is quick, automatic work without people and so on.
The system is mainly controlled by the microcontroller AT89S52, the periphery is consist of the circuit of clock and calendar, the circuit of measure height and weight, the circuit of display and print, all of these comprise the circuit board of the intelligent apparatus of height and weight. It can achieve all function of the apparatus.


KEYWORDS: microcontroller￡?ponderation¨Csensor￡?A/D converter￡?LCDdisplay
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1.2 μ?×ó3óμ?×é3é 3
1.2.1 μ?×ó3óμ??ù±??á11 3
1.2.2 μ?×ó3óμ?1¤×÷?-àí 3
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2.2.4 ?ü?ì′|àí2?·?·?°????¤ 11
μú3?? ó2?tμ??·éè?? 13
3.1 AT89S52μ?×?D??μí3μ??· 14
3.1.1 μ￥???úD???AT89S52?ééü 14
3.1.2 μ￥???ú1ü???μ?÷ 14
3.1.3 AT89S52μ?×?D??μí3μ??·113é 17
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3.3 êy?Y2é?ˉ2?·?μ??·éè?? 18
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3.4 ??ê?μ??·ó?AT89S52μ￥???ú?ó?úμ??·éè?? 22
3.5 ?ü?ìμ??·ó?AT89S52μ￥???ú?ó?úμ??·éè?? 23
3.6 ±¨?ˉμ??·μ?éè?? 24
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4.2.2 êy??×a??×ó3ìDòéè?? 27
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