基于AT89S52单片机的温湿度检测仪.doc

基于AT89S52单片机的温湿度检测仪 摘 要 随着社会的发展，人们对环境中的温度和湿度的要求也越来越高，尤其是在医学、电子电力、航天航空、食品发酵等领域中对温湿度的要求尤其严格，鉴于如此设计出一个能够精确、稳定、实时测量出环境中温湿度的实用型温湿度检测仪显得尤为重要。 本温湿度检测仪是以AT89S52单片机的为核心控制芯片，该单片机有很好的抗干扰能力、响应速度快。基于此单片机的温湿度检测仪可以实时、准确的测量环境中的温度和相对湿度。 本检测仪的硬件部分的设计采用了0809A/D转换器以高灵敏度采集湿敏电阻阻值变化，在经过单片机处理得到相应湿度； 单片机直接控制温度传感器DS18B20对温度实时采集和监控。本仪器还增加了报警装置，用户可根据需要设定温湿度上下限，若当前温湿度超限便会报警。接入独立键盘键盘实现人机交换功能，并用LCD12864作为显示设备的硬件设计方案。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C语言来实现，使各部分结合起来协调工作,最终实现对环境中温湿度的实时检测。 该温湿度检测仪能够基本完成的温湿度检测，但由于个人经验不足等因素，本设 计还有一些不足之处，离产品实用还有一定的差距，还有一些方面需要进一步完善。 关键词：AT89S52单片机,A/D转换器，传感器，LCD，温湿度 MEASURING INSTRUMENT FOR HUMIDITY BASEED ON AT89S52MICROCONTROLLER ABSTRACT With the development of society, people on the environment of temperature and humidity requirements are also increasing, especially in the medical, electronic power, aerospace, food fermentation, such as temperature and humidity in the field of the harsh demands in particular, in view of such a design that Can be precise, stable, real-time measurement of temperature and humidity environment to the practical temperature and humidity detector it is particularly important.  The temperature and humidity detector is AT89S52 as the core chip, the microcontroller has a very good anti-disturbance capacity, fast response. Based on this MCU temperature and humidity detector can be real-time, accurate measurement of environmental temperature and relative humidity.  The detector part of the design of the hardware used to with AT89S52microcontroller as the core of the control devices, with high sensitivity AD0809 colect humidity resistance change then through the MCU handle data acquisition components for humidity.AT89S52 direct control the DS18B20 obtain now temperature.The device add an alarm,it can set range.if temprature and humidity over limit it will alarming. Analog input keyboard to achieve human-computer interface exchange function and used as an LCD display hardware design. The software part is divided into several parts, a