感湿元件湿度测系统研究与开发.pdf

摘 要 空气湿度与人类密切相关。人们的日常生活和生产活动以及动植物的生存都与周 围环境的湿度息息相关。随着科学技术的发展，对湿度传感器的需求在不断增加。目 前，湿度传感器广泛应用于气象、农林、化工、纺织、食品和家用电器等许多领域。 因此，研制将湿度发生、检测、数据采集、显示集于一体的湿度传感器测试系统，对 提高工效和测试精确度，降低成本，推动传感器工业的发展均具有重要意义。 本文介绍了基于单片机的感湿元件湿度测试系统的软硬件设计。首先，对感湿元 件测试系统的发展现状、发展趋势作了简单综述；然后，详细介绍了系统的总体设计、 各模块的工作原理和软件设计过程。 感湿元件湿度测试系统的总体设计是围绕模块化、可扩展以及高精度的特点展开 的。硬件部分是以C8051F020 单片机为核心，主要由传感器模块、信号源模块、接口模块、RS-232 通信模块等组成。在软件方面，采用了功能模块化，为以后的升级或者扩展做准备。应用 Keil C51 开发环境进行程序的开发调试，设计的程序模块包括:主程序模块、 数据采集子程序 模块、数据处理子程序、LED 数码显示程序等。文中，对采集的信号采用分段线性插 值法，对温度和湿度进行了补偿，提高了测量精度。 软硬件调试结果表明各功能模块基本符合设计要求。 关键词：感湿元件；单片机 ；RS-232通信 ；湿度 ；非线性补偿 Abstract Air humidity is closely related to mankind. People’s daily life and produeing activities as well as the growth and existence are closely linked with the humidity of environment. With the development of science and technology the need of humidity sensor is increasing. At present, humidity sensor has been widely used in many fields,such as meteorology, farming and forestry,chemical fiber,textile industry food industry electrieal household appliances etc. Therefore, the humidity sensor measure system integrates the functions of the humidity occurrence , detecting , data acquisition and displaying .It is significantly for development of the industry driving sensor, improve production efficiency, measuring accuracy and reduce the cost of production. This paper introduces the hardware and software design of humidity sensor measure system based on MCU.First, a simple summary of the present situation and the developing trend of humidity sensor measurement system are given,and then the design of the system ,the principl of several modules and the realization of the sotftware are introduced in detailed. Modularization, high accuracy and extensible