【毕业设计.论文】基于单片机的温度控制系统.docVIP

基于单片机的温度控制系统设计 摘要 本设计是以单片机AT89C52为控制核心，开发了一种全数字式操作器。该控制器操作简便，控制精度高，采用LCD液晶显示，具有RS-485通信接口，并可应用于各种温度控制系统系统中。有效地提高了温度控制系统的可靠性、合理性及其稳定性。 本系统包括硬件和软件两个部分，硬件设计中包括六个部分，分别为主控部分、RS485通讯电路、LCD显示、看门狗和电源部分以及传感器采集放大电路。设计时，考虑到系统的可靠性及其性价比，在未扩展外部存储的情况下，只采用了一片AT89C51完成了整个系统的所有功能。软件部分则以C语言为编程语言，编写相应的软件程序，使本操作器在温度控制中作为控制单元具有液晶显示、按键操作、温度指示、RS-485总线结构等功能。能够方便实现对温度参数的设定和控制。 关键词：控制系统，温度测量，单片机，RS-485，C语言。 The Design of Temperature Control System Based on MCU ABSTRACT This design with Micro controller the machine AT89C51 for control core, has developed a kind of total character style manipulator. This manipulator operation is simple, has the higher control precision, uses the LCD liquid crystal display, includes RS-485 communication, and may apply to in kinds of temperature system. Effectively enhanced the transmission control system reliability, the rationality and it’s the stability. This system is consisted of two parts, both the hardware and the software. The hardware design includes six parts, controller, RS485 communication, the LCD demonstration, watchdog and power and amplify (电路). Considered when system reliability and natural price compared to, design, in has not expanded exterior memory in the situation, only used piece of AT89C51 to complete overall system all functions. The new manipulator has LCD display, keyscan operation, automatic parameter memorization, RS-485 bus and etc. At the part of software , the C language has also been presented and makes completely programmer .It can carry out to control the temperature of system and set parameter. Key words: microcontroller, temperature，AT89C51, C language, RS-485. 目 录 摘 要 I ABSTRACT II 1 绪论 1 1.1 引言 1 1.2 设计分析 1 1.2.1 模拟式 2 1.2.2 模拟式与数字式混合 2 1.2.3 全数字式 2 2 基础知识 4 2.1 纸机传动的要求 4 2.2 AT89C51单片机简介 4 2.2.1 MCS-51单片机结构及组成 4 2.2.2 AT89C51引脚功能 5 2.3 键盘及其接口技术 7 2.3.1 键盘输入的特点 7 2.3.2 按键的确认 7 2.3.3 按键开关的抖动问题 7 2.3.4 键盘与单片机的连接 8 2.3.5 矩阵式键盘接口技术 9 2.4 LCD液晶简介 10 2.4.1 LCD概述 10 2.4.2 LCD发展史 10 2.4.3 点阵式LCD行列驱动芯片RT12232F 11 2.5 现场总线技术简介 15