Wireless Sensor Networks.ppt

1、Wireless Sensor Networks (Zigbee),Traditional Sensing Method,Sensors do not have computation ability Sensors do not communicate,Current Sensing Method,Now, sensors become sensor nodes Nodes process information and communicate it wirelessly,CPU,Example of Sensor Nodes,Xbee-pro,Mica-Z,TI-Development K

2、it,Eko-Pro Environment monitor,Jennic Sensor nodes,An Important Standard,Zigbee Standard Developed by the ZigBee Alliance, found 2002 Hundreds of member companies, from the semiconductor industry and software developers to original equipment manufacturers (OEMs) and installers.,What is Zigbee?,Zigbe

3、e ZigBee is a standard that defines a set of communication protocols for low-data-rate short-range wireless networking. ZigBee-based wireless devices operate in 868 MHz, 915 MHz, and 2.4 GHz frequency bands. The maximum data rate is 250 K bits per second. ZigBee is targeted mainly for battery-powere

4、d applications where low data rate, low cost, and long battery life are main requirements.,ZigBee, Bluetooth and WLAN,IEEE 802.11 (WLAN) has a high data rate, and providing a wireless Internet connection is one of its typical applications. Bluetooth has a lower data rate (less than 3 Mbps). One popu

5、lar application of Bluetooth is in wireless headsets. ZigBee has the lowest data rate and complexity among these three standards and provides significantly longer battery life.,ZigBee, Bluetooth and IEEE 802.11 (WLAN),If the goal of wireless communication is to transmit and receive simple commands a

6、nd/or gather information from sensors such as temperature or humidity sensors ZigBee provides the most power and the most cost-efficient solution compared to Bluetooth and IEEE 802.11b.,Where are Zigbee Targeted?,ZigBee in the News,ZigBee Smart Energy is first open standard endorsed by ESMIG for Sma

7、rt Metering across Europe ZigBee offers Smart Energy to IEC as basis for an IEC HAN & Smart Metering Standard ZigBee developing an IP stack for use with Smart Energy based on IETF RFCs. ZigBee Green Power enhancement being added to the ZigBee/ZigBee PRO stack ZigBee Alliance and Demand Response & Sm

8、art Grid Coalition (DRSG) establish a liaison ZigBee RF4CE specification & Technology Paper for public down load ZigBee and Continua Health Alliance signed liaison agreement to support the deployment of ZigBee Health Care based products in the market Kroger, one of the largest retail company in the

9、US, joints ZigBees BoD ZigBee and SAE created a liaison to focus on solutions to address the advent of sales of PEVs,Zigbee Products,In-home display Zigbee Smart Energy,Advanced Metering Infrastructure (AMI),ZigBee-GSM gateway,AlertMe Intruder Alarm service,The Home Controller,SmartCode Deadbolt,NTC

10、-KKU- Lab,Support zigbee-based softwares Wireless data logger Indoor Location Tracking Support zigbee-based prototypes Magnetic Sensor for vehicle detection Next, KKU-Sensor node Expected year 2553,ZigBee and IEEE 802.15.4 Standards,IEEE 802.15.4 defines the specifications for PHY and MAC layers of wireless networking, but it does not specify any requirements for higher networking