低功耗实时唤醒式无线灌溉控制器的设计与实现

为降低现有农业无线灌溉系统中控制节点的能耗,延长无线灌溉网络的生命周期,采用OOK调制技术,设计了一种低功耗唤醒装置,改变了当前无线灌溉系统中定时周期唤醒方式,减少了系统中开销,并实现了在4 3 4 MHz频段下无线灌溉控制器的研制。控制器主要由C8 0 5 1 F9 6 5单片机、电源电路、电磁阀驱动电路、唤醒电路、无线收发通道和开关量采集电路组成。该控制器由基站发送指令控制,根据距离远近,自适应寻址接收信号,实现实时采集和控制。经试验测得:额定容量为250m Ah的单节碱性9V电池,可使控制器工作一个灌溉季以上;与采用传统唤醒方式相比,系统不仅降低了能耗,而且提高了响应速度。

Design and Implementation of Low-power Real-time Awake Irrigation Controller

In order to reduce the energy consumption of control nodes in the wireless irrigation system of the existing agri-cultural field, and to extend the life cycle of wireless irrigation network.Based on OOK modulation technology, this pa-per designs a low power wake-up receiver which changes the mode of timing period way in traditional wireless irrigation system and reduces system overhead, and develops wireless irrigation controller in 434MHZ frequency channel.The de-vice consists of C8051F965 microcontroller, power circuit, valve driving circuit, wake-up receiver, wireless transceiver channel and acquisition module.According to distance between the controller and the base-station, the controller adap-tively searches the signal which be sent by base-station, implements real-time acquiring and controlling.The test results show that a 9 V alkaline battery with the capacity of 250 mAh could support the device for more than one irrigation sea-son.Compared with the traditional way, the controller not only reduces energy consumption, but also improves real-time response.