Design Of Low Power Wearable Sensor Network

As modern life rhythm speeding up,people increasing the degree of attention to body health,in order to realize the dynamic monitoring of human body information,wearable devices would become the ideal products to people,especially the popularization of mobile intelligent devices and the maturing of the short distance wireless communication applications,public awareness of the wearable intelligent devices are rapidly increase,its portability and functionality are gradually changing people's way of life,intelligent wearable devices is not only the most effective tools for future intelligent life practice,is also a network era,in addition to the mobile phone to collect various data users important terminal.This article is based on low power consumption bluetooth 4.0 protocol with RF2.4 G custom design a applied to multiple mobile communication system of wearable devices while maintaining connections,including software and hardware two parts in the system,including hardware is divided into two types of nodes: sink node and sensor node,which mainly use the Nordic companies nRF51822 as main control chip,including the corresponding matching circuit and the design of the antenna of the radio frequency,using rechargeable batteries or buttons CR2032 battery as energy supply.The software is composed of three platforms program: IOS App,sink node and sensor node,through to the main control chip embedded into the corresponding program to complete the network communication with the phone App,through BLE4.0 agreement with custom forwarding and bridge,multicast connection and monitoring at the same time.This paper completed the multiple mobile wearable connection and data transmission of a node to a mobile phone App,the App on the iPhone can intuitively show the state of each node and the working status and function of the node can be configured,the underlying hardware design of the node with ultra-low power consumption,classification thought,energy consumption has been basically achieved sink node average current is less than 3 mA working status,sensor nodes working state average current is less than 25 uA level,they are in sleep mode current is less than 1 uA,even with button batteries,also can be a very good satisfy wearable of mobile devices.