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基于單片機的高精度電子秤設計

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高精度電子秤設計

任歌

淮北師范大學物理與電子信息學院 235000

摘要隨著時代科技的迅猛發展，微電子學和計算機等現代電子技術的成就給傳統的電子測量與儀器帶來了巨大的沖擊和革命性的影響。作為重量測量儀器，智能電子秤在各行各業開始顯現其測量準確，測量速度快，易于實時測量和監控的巨大優點，并開始逐漸取代傳統型的機械杠桿測量秤，成為測量領域的主流產品。在設計中主要問題和技術難度在于如何實現高精度的測量，且所測結果的重復性好。本文設計的電子秤以單片機為主要部件，用C語言進行軟件設計，硬件則以應變式壓力傳感器為主。秤重傳感器輸出的電量是模擬量，數值比較小，采用HX711高精度24位，自帶放大電路，設計精度達0.01g。A/D轉換的結果送單片機進行數據處理包括軟件濾波并顯示。其數據顯示部分采用LCD顯示，成本低且能很好地實現所要求的功能。

關鍵詞單片機；高精度；軟件濾波

The Design of The High-precision Electronic Scale

Ren Ge

School of Physics and Electronic Information, Huai Bei Normal University, Anhui Huaibei, 235000

Abstract With the rapid development of technology of the times, the achievements of microelectronics and computers and other modern electronic technology play huge and revolutionary impact on the traditional electronic measuring instrument. As a weight measuring instruments, intelligent electronic scale has shown its high accuracy and speed. It has advantages in real-time measurement and monitoring, and began to gradually replace traditional mechanical scales. Intelligent electronic scale has become the mainstream products in the field of measurement.
In this paper, the microcontroller is used as the main the component of the electronic scale, C language is utilized as the software and the strain gauge pressure sensor is used as the main hardware. Because the output is analog and the value of it is relative small, HX711 with precision is 24 bits is used as the main AD converter and amplifier, the accuracy of the scale is 0.01g. The results of AD converter are sampled by the microcontroller, and the information is filtered and displayed. The results are shown in LCD, the system has low cost and can be realized easily.

Keywords Single-chip microcomputer;High-precision;Software filter

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