冷库温度控制系统的设计毕业论文.doc

大连交通大学信息工程学院 毕 业 设 计 (论 文) 题 目 冷库温度控制系统的设计 学生姓名 专业班级 自动化 班 指导教师 ** 职 称　　教授 所在单位 电气工程系 教研室主任 　 完成日期 年 6 月 29 日 摘 要 温度是日常生活中无时不在的物理量，温度的控制在各个领域都有积极的意义。随着微机测量和控制技术的迅速发展与广泛应用，以单片机为核心的温度采集与控制系统的研发与应用在很大程度上提高了生产生活中对温度的控制水平。 本设计是基于STC89S52单片机对冷库温度检测并实现自动控制的系统。主要由电源、系统控制电路、温度检测电路、温度显示电路、执行电路、提示电路等组成,以STC89S52单片机为控制器，利用DS18B20温度传感器检测当前冷库中的温度值，通过控制器及辅助电路进行计算输出并在LCD上显示当前冷库的温度值；如果测量到冷库中的温度值达到设定温度的上、下限值时，系统通过STC89S52发出控制信号完成提示功能，同时启动或停止执行电路，使温度快速达到设定的范围内。此冷库温度控制系统结构简单，控制效果良好。 关键词：单片机 DS18B20传感器 温度控制 显示电路 ABSTRACT The temperature is in daily life the ever-present physical quantities, the control of the temperature in various fields have positive significance. Along with the computer measurement and control technology of the rapid development and wide application, with the single chip processor as the core temperature gathering and control system development and application greatly improve the production of the control of the temperature in the life level. This design is based STC89S52 microcontroller cold storage temperature sensing and automatic control system. Mainly by the composition of the power, the system control circuit, the temperature detection circuit, the temperature display circuit, executive circuit, and prompt circuit. System microcontroller to STC89S52 as the controller, DS18B20 temperature sensor detects the temperature of the cold, calculated output and the current cold storage temperature value displayed on the LCD controller and auxiliary circuits; If the measured temperature in cold storage to achieve set given temperature, the lower limit, the system through STC89S52 control signals to complete the prompts to start or stop the implementation of the circuit, so that the temperature is quickly reached within the set range. The refrigerator temperature control system is simple, good control effect. Key words: single-chip microcomputer the sensor DS18B20