The electronic scale is mainly controlled by stc90c52rc, which realizes the basic control function of the electronic scale. The system can be divided into six parts: minimum system, data acquisition, human-computer interface, system power supply, clock and voice number. The minimum system part mainly includes stc90c52rc and classic reset circuit; the data acquisition part is composed of load cell, signal amplification and a / D conversion part, and the signal amplification and a / D conversion part are mainly realized by special high-precision 24 bit AD conversion chip hx711; the human-computer interaction interface is keyboard input and dot matrix LCD, which mainly uses 4 * 4 matrix keyboard and 1602 LCD With convenient input data and intuitive display data, the clock module is mainly composed of clock chip DS1302 and clock circuit; the voice number module can read voice content such as time, weight, unit price and amount of electronic scale system, mainly realized by sc1010b. The electronic scale can realize the basic weighing function (weighing range is 0-5kg, weight error is not more than ± 0.005kg), and expand the function of clock and voice alarm. The clock module can also set the alarm function. The system also has over range alarm function when weighing. The whole system is simple in structure, convenient in use, complete in function, high in precision and has certain development value.<br>
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