设计说明书
总字数：14000+
摘要
在日常称重场景中，精准、便捷的重量测量及超限预警需求日益凸显。传统秤具多依赖机械结构或单一显示功能，不仅测量精度有限，且缺乏自动报警和数据记录功能，难以满足现代生活中对重量监测的智能化需求，如快递称重、食材配比、物品限重等场景。
基于 STC89C52 单片机的智能电子秤，整合了 HX711 称重模块、3 个独立按键、LCD1602 显示屏、ECB02 蓝牙模块及声光报警模块，实现了重量的精准测量、超限报警、参数设置及数据远程传输。系统核心功能包括：通过 HX711 模块获取重量数据，经单片机处理后由 LCD1602 显示屏实时显示；当测量重量大于预设最大值时，触发声光报警模块发出警示；支持通过独立按键设置重量最大值，操作便捷；借助 ECB02 蓝牙模块将重量数据发送至手机端，实现数据的远程查看与记录。
该系统的实现，有效提升了称重过程的自动化与智能化水平，解决了传统秤具功能单一、预警滞后的问题，为各类称重场景提供了精准、高效的解决方案，同时为同类智能称重设备的研发提供了参考，具有较高的实际应用价值。
关键词：STC89C52；智能电子秤；HX711；称重监测；声光报警；蓝牙通信
ABSTRACT
In daily weighing scenarios, the demand for accurate, convenient weight measurement and over-limit early warning is increasingly prominent. Traditional scales mostly rely on mechanical structures or single display functions, which not only have limited measurement accuracy but also lack automatic alarm and data recording functions, making it difficult to meet the intelligent needs for weight monitoring in modern life, such as express weighing, ingredient proportioning, and item weight limitation.
The intelligent electronic scale based on the STC89C52 microcontroller integrates HX711 weighing module, 3 independent buttons, LCD1602 display, ECB02 Bluetooth module, and sound-light alarm module, realizing accurate weight measurement, over-limit alarm, parameter setting, and remote data transmission. The core functions of the system include: obtaining weight data through the HX711 module, which is processed by the microcontroller and displayed in real-time on the LCD1602 display; when the measured weight is greater than the preset maximum value, triggering the sound-light alarm module to issue a warning; supporting the setting of the maximum weight value through independent buttons, with convenient operation; sending weight data to the mobile phone via the ECB02 Bluetooth module to realize remote viewing and recording of data.
The implementation of this system effectively improves the automation and intelligence level of the weighing process, solves the problems of single function and delayed early warning of traditional scales, provides an accurate and efficient solution for various weighing scenarios, and also offers a reference for the research and development of similar intelligent weighing equipment, with high practical application value.
Keywords: STC89C52; Intelligent electronic scale; HX711; Weighing monitoring; Sound-light alarm; Bluetooth communication
目录
第 1 章 绪论
1.1 研究的目的及意义
1.2 国内外发展情况
1.3 本文主要研究内容
第2章 设计思路与方案论证
2.1 主要元器件选择
2.1.1 主控芯片选择
2.1.2 称重模块选择
2.1.3 按键模块选择
2.1.4 显示模块选择
2.1.5 蓝牙模块选择
2.2整体设计方案
第 3 章 硬件设计
3.1 主控电路模块
3.2 称重模块电路
3.3 显示模块电路
3.4 按键模块电路
3.5 蓝牙模块电路
3.6 声光报警模块电路
第4章 系统程序设计
4.1 编程软件介绍
4.2 系统主流程设计
4.3 LCD1602显示模块子流程设计
4.4 独立按键子流程设计
4.5 蓝牙模块子流程设计
4.6 称重模块子流程设计
第 5 章 仿真测试
5.1 整体仿真测试
5.2 称重模块功能测试
5.3 显示模块功能测试
5.4 按键模块功能测试
5.5 蓝牙模块功能测试
5.6 声光报警模块功能测试
第 6 章 实物测试
6.1 整体实物测试
6.2 称重模块功能测试
6.3 显示模块功能测试
6.4 按键模块功能测试
6.5 蓝牙模块功能测试
6.6 声光报警模块功能测试
第 7 章 总结与展望
7.1 总结
7.2 展望
致谢
参考文献
附录
附录一：原理图
附录二：PCB
附录三：主程序
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