摘要
介绍一款以STC89C52RC单片机为控制器,利用电阻应变片为称重传感器的电子称设计方法。受力改变应变片的阻值,进而改变输出电压。通过建立数学模型,使输出电压与压力成线性关系,从而得到物体质量。称重传感器在受到压力时形变量小,输出的电压信号微弱,采用高精度转换芯片HX711将信号放大并进行模数转换,使转换数值与物重相对应,并用12864液晶屏显示。根据现实需求,电子称可实现计价和超重报警等功能。
This paper presents the design of an electronic scale based on STC89C52RC MCU, which uses resistance strata gauges as the bridge weighing sensor. Output voltage can be manipulated by the resistance of strain gauge, which is related to its strain. By establishing mathematical model, the output voltage forms linear relationship with the the object weight. The design utilizes the high precision conversion chip HX711 to amplify the weak voltage signal since the strain is very small. As a result, the object weight is displayed on a 12864 LCD. To meet practical demand, the electronic scale can realize the function of valuation and overload alarm.
出处
《国外电子测量技术》
2017年第5期94-97,共4页
Foreign Electronic Measurement Technology
基金
国家自然科学基金(61640006)资助项目
