Research on water meter reading system based on LoRa communication

IoT water meter and remote meter reading technology has become an important part of energy measurement. In order to realize low power consumption and remote reading of water meters, this paper proposes a wireless meter reading system by using both the multilevel relay and the concentrator based on LoRa communication. In order to meet the meter's ultra-low power need, the ST's low power consumption microcontroller (STM8l151G) has been selected for controlling SX1278 and flow measurement. The water meter works in an average current of 50 A. And the relay uses MSP430F169 ultra-low power microprocessor and SX1278. On the basis of “`CJ / T 188-2004' user data transmission using measurement instruments and technical conditions industry-standard protocol and Q/GDW 1376.1-2013 `power users information collection system communication protocol'” industry standard protocols, this paper modifies both of them to fit for the water meter reading industry and increase the address defined for multi-level relay, the concentrator and master station address, and then develops a multi-level wireless repeaters and concentrators Reading downlink protocol and a uplink protocol between the concentrator and the data center. The system has completed the design of hardware and software, and achieved the accurate measurement of the water meter data, and transmit the data to the concentrator through the multi-level relay by LoRa. Finally, the remote data transmission is carried out by the concentrator through GPRS channel. By testing, the system's meter reading distance, the quantity of the meter accessed and the reliability of data communication can meet the application requirements.