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本科生毕业论文(设计)
题目: USB接口的多路温湿度
采集系统设备端设计
学院电子信息工程学院
学科门类工学
专业自动化
学号
姓名
指导教师
2008年5月20日
USB接口的多路温湿度采集系统设备端设计
摘要
温度与湿度是保证档案管理、纺织、食品、医药、仓储、畜牧养殖、种植业等场所正常运行的重要参量。新的温、湿度参量检测技术在这些领域的应用有益于保障安全、提高生产效率、改善产品质量。随着计算机的普及,大量针对计算机接口的外设也越来越多。其中USB接口由于其高速、即插即用、低成本、可扩展性强等优点,被大量应用于测试系统中。现在大部分PC已经离不开USB接口,有人预言未来所有的总线接口都将被USB技术统一。USB接口技术为PC主机与设备间的数据传输提供了便捷的方案。
本文先介绍USB技术优点,然后介绍USB传输协议和接口芯片PDIUSBD12及其数据传输机制。介绍USB接口的多路温湿度采集系统的总体构成框架,芯片PDIUSBD12与AT89S52单片机的软硬件连接结构,详述I2C总线数字温湿度传感器SHT11的各项参数和应用方法,最后详细介绍其固件编写方法。
关键词:USB PDIUSBD12 AT89S52 温度湿度
Design of Multiplex Temperature and Humidity
Collecting System Based on USB
ABSTRACT
Temperature and humidity are the important parameters that archive management, textiles, food, pharmaceutical, warehousing, livestock breeding, cultivation and other places operated normally. The new detection technology of temperature and humidity parameters conduces to protection of security, increases productivity,and improves product quality in these areas. With the popularity puters, the number of peripherals puter interface is also larger and larger. Because of its high-speed, plug-and-play, low-cost, scalability, and so on,USB is used largely in the testing is said that USB technology will be applied in all bus interfaces in the interface technology provides a wonderful solution for the data transmission between PCs.
This article first introduces the advantages of USB technology,then it introduces USB transfer protocol, interface chip PDIUSBD12 and data transmission overall framework of the multiplex temperature and humidity collecting system based on USB and the connecting structure of microcontroller chip AT89S52 and PDIUSBD12 will be introduced later. Finally,it introduces the single chip relative humidity and temperature multi sensor,detailing its various parameters, application methods and firmware writing method of the system.
Key words:USB PDISUBD12 AT89S52 temperature humidity
目录
一引言