基于单片机的PCB恒温腐蚀箱的设计.doc

摘要：本设计的测量及加热控制系统以单片机为核心部件，通过对系统软件和硬件设计的合理规划，发挥单片机自身集成众多系统级功能单元的优势，在不减少功能的前提下有效降低了硬件成本，系统操控简便。 Abstract: The design of the temperature measurement and heating control systems to AT89S51 microcontroller core component, plus the temperature acquisition circuit, keyboard and display circuit, heating circutal temperature sensor DS18B20, and the determinant of the keyboard and dynamic display in order to easily control the solid-state relays for heating control of the switching device. This works both on the current temperature in real-time display of temperature can be controlled in order to enable users to reach the required temperature, and make it constant at this temperature. Humanized design keyboard determinant temperature easy Express, the two decimal integer, a display shows a higher accuracy. Set up in the fuzzy control theory, control algorithms, so that the control accuracy can meet the general requirements of social production. Through the system software and hardware design of rational planning, exert their own single-chip integration of many system-level functional unit of the advantages, does not reduce the functions at the premise of effectively reducing the cost of hardware, the system easy to manipulate.  Key words: microcontroller； temperature control； fuzzy control 目 录 1 绪 论 1.1本课题的目的和意义 1.2 国内外研究现状及存在的问题 1.3PCB恒温腐蚀箱的可行性和必要性 9 1.4PCB恒温腐蚀箱的制作过程 9 1.5恒温腐蚀箱应用前景 10 2 设计要求与方案论证 10 2.1系统设计要求 2.2系统基本方案选择和论据 2.2.1单片机芯片的选择方案和论证 2.2.2显示模块的选择方案和论证 2.2.3温度传感器的选择方案和论证 2.2.4键盘模块选择方案和论证 3 系统硬件设计 3.1原理框图 3.2各功能模块的设计 3.2.1单片机主控制模块设计 3.2.2电源模块设计 3.2.3显示模块设计 3.2.4温度传感器电路设计 3.2.5键盘模块设计 3.2.6加热模块设计 31 3.2.7报警指示灯设计 31 3.3系统总方案图 32 4系统 33 4.1 温度采集问题 33 4.2 温度报警及切断加热问题 33 4.3 腐蚀法存在问题 34 5 系统软件设计 5.1程序流程图 5.1 系统主流程图 5.2 读取温度值流程图 5. 3 按键流程图 5.4 LCD初始化流程图 6 系统安装软硬件调试 6.1系统硬件调试 44 6.2硬件工具和Keil调试流程 6.2.1 keil软件简介及调试 46 6.3 Proteus ISIS 简介及调试 48 6.4调试过程中遇到的困难 50 6.5 系统调试最终结果图 50 7心得体会 51 致 谢 参考文献 附 录 附录1： 55 附录： 56 附录：程序 1 绪 论