毕业设计（论文）-基于51单片机的数字温湿度计设计与实现.doc

基于51单片机的数字温湿度计设计及实现 摘 要：温度和湿度是两个最基本的环境参数，人们生活与温湿度息息相关。在日常生活、工业、医学、环境保护、化工、石油等领域Digital Thermometer and humidity Based on Single Chip Microcomputer Abstract ： Temperature and humidity are the two most basic environmental parameters, which are closely related to peoples lives and the temperature and humidity. Temperature and humidity measurement and control are often needed to ambient in the field of daily life, industry, medicine, environmental protection, chemical, petroleum, etc.,. Accurate measurement of temperature and humidity in the pharmaceutical, food processing, paper industry is essential. Therefore, studying the temperature and humidity measurement methods and devices is of great significance.???This paper describes a microcontroller AT89S52 control devices, digital temperature and humidity sensors to DHT11 new digital hygrometer. The design includes the design of hardware circuits and system software design, hardware circuit includes a master controller, the measurement of temperature and humidity control circuit and display circuit. DHT11 is a composite Sensor contains a calibrated digital signal output of the temperature and humidity. Application of a dedicated digital modules collection technology and the temperature and humidity sensing technology, to ensure that the product has a Song high reliability and excellent long-term stability. Display circuit LCD1602 LCD display, 8-bit microprocessor interface, mapped by the internal 80 × 8-bit DDRAM 2 line x 16 character display, convenient and intuitive. The software part includes the main program, the measured temperature and humidity subroutine to display subroutine. The digital hygrometer with DHT11 with AT89S52 not only has the simple external circuit, but also facilitate debugging and simulation. Keywords：Temperature and humidity sensor; the LCD1602; protell; keil software 目 录 1 绪论 1 1.1 选题意义 1 1.2 国内外发展趋势 1 2 温湿度计的发展 3 2.1 温度计的发展史 3 2.2 湿度测量方法 3 3 开发工具keil和protel 5 3.1 Keil C51 5 3.1.1