超市智能电子秤设计

北京理工大学珠海学院2020届本科生毕业设计With the continuous development of social science,China's electronic industry isbooming,the various applications of single-chip microcomputer has been into thousands ofhouseholds,the purpose of the design is to use single-chip microcomputer technology,toachieve low cost and high performance intelligent electronic scale design,can in the actual lifeof this product in the availability and improve the direction.This design used in the single-chip microcomputer control method is relatively simpleSTC89C52 chip as kernel,collocation is specially designed for high precision electronic saidHX711 type A/D conversion chip,using the pressure caused by the change of the analogquantities such as voltage,current and classic transformation between digital signal and analogsignal sensor principle,realization of high precision weighing function,the technology ofsingle chip microcomputer is not only high precision,but also has strong anti-interferencecapability.Hardware aspects include data acquisition systems,minimum circuit systems,and inputand display systems.The weighing sensor and the data acquisition module of HX711 realizethe high-precision measurement of voltage signal change (related to pressure),and the signalamplification is realized through the amplification circuit.The minimum system not onlyensures that the collected signal can be processed under the lowest energy consumption andrun smoothly,but also reduces the difficulty of hardware manual operation.In addition,man-machine interaction function and all kinds of humanized design are alsothe focus of this design,the input and display system makes the system appear more intelligentand real-time.Input in order to achieve the unit price,amount of computation,peel (removal ofweighing the weight of the glass or other items),and other functions,this design USES theclassic 4 x 4 membrane keyboard artificial control electronic scale basic functions,and thevarious buttons control function is set by the software,the concrete through real-timeinformation display LCD12864 LCD screen.Keywords:STC89C52;A/D converter;Liquid crystal display;Film keyboard;Minimum system;