基于LoRa的多传感器低功耗数据采集方法

Method of multi-sensor low-power data acquisition based on LoRa

针对LoRa多传感器低功耗采集中同信道传感节点无效唤醒的问题,提出一种基于空中唤醒策略与信道切换机制相结合的低功耗采集方法。通过将LoRa通信链路划分为多个通信信道,不同信道分时切换复用,实现多传感节点的分组通信,避免从传感节点的无效唤醒,在有限信道容量下最大限度地降低从节点的通信功耗;并制定了LoRa局域网传感器通信指令协议,实现了多传感器的低功耗主动轮询采集、定点调试与预警上报。实验结果证明了所提方法的有效性。

In allusion to the problem of invalid wake-up of sensor nodes in a multi-sensor acquisition system,which based on the same LoRa communication channel,a low-power working method based on wake on radio strategy and channel switching mechanism is proposed.In this method,the LoRa communication link is divided into multiple communication channels,the switching and time division multiplexing of different channels are conducted,and group communication of multiple sensor nodes is realized,avoiding ineffective wake-up from sensor nodes and minimizing communication power consumption of slave nodes under limited channel capacity.A LoRa local area network sensor communication instruction protocol is developed,which can realize the low-power active polling collection,fixed-point debugging,and early warning reporting of multiple sensors.The experimental results demonstrate the effectiveness of the proposed method.