无线电工程

为提高水表的抄表效率及计量精度,同时针对Zigbee、红外等无线技术在抄表方案中存在通信距离短、抗干扰能力弱的缺陷,通过对LoRa无线标准协议的研究,将MCU系统和LoRa技术相结合,设计了一种基于LoRa无线通信技术的智能水表。介绍了水表的硬件组成和功能模块的作用,给出了通信单元和电磁阀门控制单元硬件原理图,简述了通信协议和节点软件设计过程,对水表的通信距离和在定时、单播和广播抄表方式下进行测试。测试结果表明,该水表具有通信距离远、可靠性高和实时性强的特点。

In order to improve the efficiency and accuracy of water meter,at the same time taking into consideration the defects of Zigbee and infrared wireless technology in meter reading scheme including short communication distance and weak anti-interference capability,an intelligent water meter based on LoRa wireless communication technology is designed based on research of LoRa wireless standard protocol and by combining the MCU system and LoRa modulation technology. First the hardware structure of the water meter and the function of function modules are introduced.The hardware principle diagram of the communication unit and the electromagnetic valve control unit are given. Secondly,the communication protocol and node software design process are described briefly. Finally,the communication distance of the water meter and the method of timing,unicast and broadcast meter reading are tested. The test results show that the water meter has the advantages of long communication distance,high reliability and real-time performance.