温湿度检测仪的设计毕业设计论文.doc

温湿度检测仪的设计 摘 要 温度、湿度和人类的生产、生活有着密切的关系，同时也是工业生产中最常见最基本的工艺参数STC89C51单片机为核心控制芯片，该芯片具有低功耗，高速，高可靠，功能稳定，响应速度快等优点。系统采用集温湿度传感器与A/D转换器为一体的SHT11芯片采集环境中的温湿度，键盘输入电路与LCD显示电路实现人机对话的功能。此外，在通信方面使用RS-232串行数据接口与计算机进行数据传输。软件部分则采用模块化的方法将其分成几个部分，然后逐模块设计程序，用汇编语言来实现，最终使各部分结合起来协调工作。 该温湿度检测仪结构简单，能够完成温湿度检测，实现主要的温湿度检测功能。 关键词：单片机，传感器，温湿度，LCD DETECTING INSTRUMENT FOR TEMPERATURE AND HUMIDITY ABSTRACT Temperature, humidity are closely related to human production and life, and they are also the most common basic process parameters of the industrial production. With the development of social economy, the requirements in environmental temperature and humidity are also getting higher and higher, especially in the industrial and agricultural production, weather, environmental protection, national defense, scientific research, aerospace and other departments,in which fields we often need to measure and control the temperature and humidity in the environment strictly. Therefore, the design of an accurate, stable, real-time practical temperature and humidity detector to measure the temperature and humidity is particularly important. The temperature and humidity detector uses STC89C51 microcontroller as the core control chip. the chip has the advantages of low power, high speed, high reliability, stable function, fast response, and so on. System uses SHT11 chip integrated with temperature and humidity sensors and A / D converter to collect the temperature and humidity information of the environment. The keyboard input circuit and LCD display circuit are used to realize the man-machine conversation function. In addition, in the area of communications. RS-232 serial data interface is used for data transfer with the computer. Software part will be divided into several partsuses using the modular approach , and then design procedures module by module, using assembly language to achieve, and finally combine the various parts for coordination. The structure of the temperature and humidity detector is simple,