1、基于基于 USB 接口的温度控制器接口的温度控制器 毕业设计毕业设计 摘 要 USB（Universal Serial Bus）是一种新型的通用串行总线，它是快速的、双向的、 同步的、可以热插拨的、动态连接且价格低廉的串行接口。正是基于这一特点，现在很 多的计算机外设都有 USB 接口。本文正是利用这一新型 USB 接口来设计上位机与下位机 系统之间的通信。利用新型的一线式数字温度传感器测量温度，并通过 USB 接口和计算 机端应用软件进行通信。 本文首先介绍了本系统相关的背景知识以及 USB 的通信协议，进而介绍温度控制的 基本意义，提出利用 USB 设备芯片 CH372、一线式数字温度传感
2、器 DS18B20 和单片机 AT89C51 来开发基于 USB 温度控制系统。采集的温度数据通过 USB 接口上传到上位 PC 机上，并利用应用软件对其进行处理。上位机应用软件用 C + builder 编写，其运用 CH372 接口芯片的动态链接库建立起上位机和下位机之间的通信机制。上位机将采集到 的温度数据在 PC 机上显示出来，并且显示实时温度采集图像。 此外，应用软件可以对下位机进行温度极限设置等简单控制功能，当采集到的温度 超过某一设定极限温度，则对系统进行报警。另外下位机还为今后的扩展保留一定的资 源。 关键词： AT89C51；USB 协议； 温度采集 ；一线式温度传感器 ；C
3、H372 Abstract USB (Universal Serial Bus) is a kind of new Universal Serial Bus, it is a serial bus which is very fast, dual channel, synchronous, can be pulled and plugged with the power on (Hot Swap), can be connected dynamically and very cheap. Because of this characteristic, nowadays, a great man
4、y type of computers have USB interface. The project presented in this dissertation used this new USB interface to design the communication between upper computer and down computer system. With the one wire temperature sensor, I measure the temperature and communicate with the computer application th
5、rough the USB interface. At the beginning of this dissertation, some basic knowledge about the system and communication protocol of USB (Universal Serial Bus) will be described, and later, introduced the basic meaning of temperature control, This dissertation also brought forward this idea: to devel
6、op the temperature control system which is base on the USB, and those tools the system will need are USB device chip CH372, one wire digital temperature sensor DS18B20 and single chip AT89C51.The temperature system got will upload to the upper computers application through USB interface. The upper computers application is programmed in the environment of C+ builder; the software I programmed used the DLL (dynamic link library) of CH372 and built the communication system between upper comput
