Design and realization of remote monitoring system for soil moisture in citrus orchards

For finding a way to retrieve, transmit and store data in large-scale, full-coverage soil moisture in citrus orchards, remote monitoring system based on ZigBee and J2EE technology was developed and tested. The XBee-PRO unit with ZigBee wireless data transfer function and soil moisture sensor EC-5 unit as the core of the senor node, and used to take charge of data sampling, preprocessing and wireless transmitting collected data transmitted through the gateway based on ARM9 to the host web. Remote monitoring centre system could achieve data analysis and remote, real-time monitoring. Packet delivery rate (PDR) and time-consuming experiment results indicated that, a stable data transmission was achieved since PDR had a high success rate at 98% and time-consuming less than 100 ms.