基于单片机实现的仓库温湿度的监测系统毕业论文.doc

仓库温湿度的监测系统 摘 要 人类的生存和社会活动都与温度湿度息息相关。在人们的日常生产和生活中都离不开温度和湿度的测量。本文设计了一种简单适用的空气温度和湿度的检测器，它能精确实时的测量出空气的温度和相对湿度。其湿度范围1％～100％RH，精度为％RH；温度范围为55℃～125℃，显示精度为±℃。 本设计选用了嵌入式系统，结构简单、体积小、实时性好，便于实时采集环境温度和湿度。并设计了与上位机的通信接口，可接入上位机，实现综合管理、存储数据、打印曲线及事后数据处理。55℃～℃内的所有场所。湿度传感器 模/数转换器 单片机 串行通讯 ABSTRACT Temperature and the moisture are indispensable to people’s existence and social activities. People cannot do without the measurement of temperature and humidity. In This article, THE author described the design of an air temperature and moisture sensor which is simple and readily available. It can be used to measure out the real time temperature and relative moisture of the air in an exact way. the scope of the of moisture ranges in 1％ ~100% RH, and the manifested accuracy degree is 2% RH; The temperature scope is-55 ℃～ + ℃ ,and the showed accuracy degree is the ± 1℃ . I use AT89C51 as Central Processing Element for the system, and constitute the core parts together with the basic electric circuits such as A/D converting, keyboard manifesting and RS-485 electric circuits around it. The system collects the data of temperature and humidity by the temperature sensor DS18B20 and the humidity sensor HM1520 at the most the 16 places. Such functions help to complete the temperature and humidity measurement, manifestation at the real time and the date transmitting. Embedded system is used in this design which is simple in construction, small in volume, inexpensive in cost and really handful. It is convenient for collecting data about temperature and humidity at the real time. Communications interface is also intercalate to get connected with the xxx for realizing integrated management, data recording, and the printing of curve and the data processing afterwards. After simple transformation, it can be connected into the control circuits and functions as a glasshouse intelligence director which can be used to measure temperature and humidity, manifest them at the real time, transmit data, and