基于单片机的水温控制系统设计论文(2).doc

水温控制系统 摘要： 该水温控制系统采用单片机进行温度实时采集与控制。温度信号由“一线总线”数字化温度传感器在-10+85°C范围内, 固有测温分辨率为0.5 ℃Abstract: This water temperature control system uses the Single Chip Microcomputer to carry on temperature real-time gathering and controling. DS18B20, digitized temperature sensor, provides the temperature signal by a main line. In -10～+85℃ the scope, DS18B20’s inherent measuring accuracy is 0.5 ℃. The water temperature real-time control system uses the electricity nichrome wire carring on temperature increiseament and operates the electric fan to realize the temperature decrease control. The system has the higher measuring accuracy and the control precision, it also can complete the elevation of temperature and the temperature decrease control. Key Words: AT89C51 DS18B20 Water temperature control 目 录 1. 系统方案选择和论证……………………………………………………………2 1.1 题目要求……………………………………………………………………………………2 1.1.1　基本要求…………………………………………………………………………2 1.1.2　发挥部分…………………………………………………………………………2 1.1.3　说明………………………………………………………………………………2 1.2　系统基本方案……………………………………………………………………………2 1.2.1　各模块电路的方案选择及论证…………………………………………………2 1.2.2　系统各模块的最终方案…………………………………………………………5 2. 硬件设计与实现……………………………………………………………………………6 2.1系统硬件模块关系…………………………………………………………………………6 2.2　主要单元电路的设计……………………………………………………………………6 2.2.1　温度采集部分设计………………………………………………………………6 2.2.2　加热控制部分……………………………………………………………………8 2.2.3　键盘、显示、控制器部分………………………………………………………8 3. 系统软件设计……………………………………………………………………………10 3.1 读取DS18B20温度模块子程序…………………………………………………………10 3.2　数据处理子程序…………………………………………………………………………10 3.3　键盘扫描子程序…………………………………………………………………………12 3.4　主程序流程图……………………………………………………………………………13 4. 系统测试……………………………………………………………………………………14 4.1 静态温度测试……………………………………………………………………………14 4.2动态温控测量………………………………………………………………………………14 4.3结果分析……………………………………………………………………………………14 附录1：产品使用说明……………………………………………………………………………15 附录2：元件清单…………………………………………………………………………………15 附录3：系统硬件原理图…………………………………………………………………………16 附录4：软件程序清单……………………………………………………………………………17 参考文献…………………………………………………………………………………………26 1.系统方案选择和论证 题目要求 设计并制作一个水温自动控制系统，控制对象为1L净水，