Aiming at the actual demand for monitoring environmental information,a wireless sensing system for temperature and relative humidity(RH)monitoring based on radio frequency(RF)technology and mobile network was designed...Aiming at the actual demand for monitoring environmental information,a wireless sensing system for temperature and relative humidity(RH)monitoring based on radio frequency(RF)technology and mobile network was designed.This paper introduces the architecture of the system.The system uses AVR micro controller unit(MCU),KYL-1020U RF module and SHT71 to complete real-time temperature and humidity monitoring,and uses SIM900A module to realize remote alarming and monitoring with short message system(SMS)through global system for mobile communication(GSM).Experimental results show that the designed system has good stability of measurement and real-time performance,and it can be used in some small temperature and humidity monitoring occasions.展开更多
提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借...提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借助无线网桥,实现数据远距离传输。该系统无需标定,具有很好的环境适应性。实际应用中,监控终端能够与5 km外的上位机实现可靠的信息交互,对远程控制命令响应时间小于500 m s,保证了被监控设备全天候稳定工作。展开更多
文摘Aiming at the actual demand for monitoring environmental information,a wireless sensing system for temperature and relative humidity(RH)monitoring based on radio frequency(RF)technology and mobile network was designed.This paper introduces the architecture of the system.The system uses AVR micro controller unit(MCU),KYL-1020U RF module and SHT71 to complete real-time temperature and humidity monitoring,and uses SIM900A module to realize remote alarming and monitoring with short message system(SMS)through global system for mobile communication(GSM).Experimental results show that the designed system has good stability of measurement and real-time performance,and it can be used in some small temperature and humidity monitoring occasions.
文摘提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借助无线网桥,实现数据远距离传输。该系统无需标定,具有很好的环境适应性。实际应用中,监控终端能够与5 km外的上位机实现可靠的信息交互,对远程控制命令响应时间小于500 m s,保证了被监控设备全天候稳定工作。