Measurement And Control System Of Museum Microenvironment Based On LoRa Communication

China is an ancient country with five thousand years of civilization.Cultural relics are historical relics and relics,bearing historical culture and the product of human social practice,so the protection of cultural relics is particularly important.At present,science and technology are used to protect Museum Cultural Relics at home and abroad,in which wireless terminals are used to collect environmental factors,and then measurements are taken to control environmental factors within the standard range.Aiming at the problems of high power consumption,high cost and short communication distance existing in ZigBee,WiFi and Bluetooth wireless communication technology,which are used in the wireless mode of detection terminal in Museum environmental protection,this paper proposes a museum micro-environment measurement and control system based on LoRa communication.The main contents of this paper include the research of LoRa technology foundation,the micro-environment measurement and control system based on LoRa communication.The overall structure and network architecture of the system are introduced in detail.The overall structure of the system includes a humidity-constant machine to control the relative humidity in the exhibition cabinet,a wireless terminal to detect the temperature,humidity,ultraviolet ray and light intensity in the exhibition cabinet,a gateway and a host computer.The network architecture is the network architecture of star network polling.The hardware design of the terminal and the hardware module of the gateway,the program design of the terminal and the program design of the gateway are introduced in detail.The network architecture of star network polling is realized by using the air wake-up mode of LoRa module.Finally,the whole system is tested,including terminal power consumption,packet loss rate,communication distance and system operation.The test results show that the system can run normally,the power consumption of the terminal is low.The bit error rate of communication nodes is less than 0.3%,which meets the requirements of cultural relics protection standards.And the transmission distance is about 1.1km.Compared with the ZigBee communication system commonly used in museums in China,the system has the advantages of low power consumption,low cost and long distance.