基于单片机的双容水箱液位控制器设计-毕业设计.doc

本科生毕业设计说明书（毕业论文） 题 目：基于单片机的双容水箱液位控制器设计 学生姓名： 学 号： 专 业：测控技术与仪器 班 级： 指导教师：基于单片机的双容水箱液位控制器设计 摘 要 关键词：Based on single chip dual tank water level controller design Abstract The level is charged with one of the parameters of the industrial production process, the most important, widely used in metallurgy, building materials, chemicals, food, petroleum and other industries, the level of control in the process directly influences the production of productsquality. Level Control System scale of modern industry are becoming increasingly complex, large-scale, level control has gradually become the Process Control field of a hot research topic. Based on single chip water level controller has many advantages, such as stable performance, reliable, high control precision, low cost, easy set up, easy operation. The design use single chip achieve dual-tank water level control system is based on the two upper and lower water tanks in series for the study, the following tank level is controlled parameters, the pressure transmitter to measure the level of the water tank, and the measurements gave microcontroller as the core controller as the feedback signal, the controller based on incremental PID control algorithm is pre-set computing, issue control commands to control the actuator valve opening size, thus changing into the flow of water on the tank size. tank liquid level automatic control. Key words: single chip STC89C52,liquid level control, incremental PID control algorithm, LED display  目 录摘 要 I Abstract II 第一章 引言 1 1.1 研究背景 1 1.2 国内液位控制的发展现状 1 1.3 PID调节器简介 2 1.4 设计思路 2 1.5 设计意义 3 第二章 硬件组成 4 2.1 系统硬件组成概述 4 2.2 数据采集电路 4 2.2.1 压力变送器 4 2.2.2 I/V转换电路 5 2.2.3 A/D转换器 5 2.3 STC89C52RC单片机 8 2.4 D/A转换器 10 2.4.1 DAC0832引脚功能 11 2.4.2 DAC0832工作方式 12 2.4.3 DAC0832工作时序 12 2.5 V/I转换电路 12 2.6 执行机构 12 2.6.1 控制阀 12 2.6.2 水泵电机 13 2.7 掉电存储器 13 2.8 LED显示 14 2.8.1 LED显示器的结构 14 2.8.2 移位寄存器 16 第三章 硬件设计 19 3.1 STC89C52单片机模块电路 19 3.1.1 晶振电路 19 3.1.2 复位电路 19 3.1.3 最小系统 20 3.2 LED显示模块