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Wireless Sensor Networks Using ZIGBEE

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Title: Wireless Sensor Networks Using ZIGBEE Author: alokdrocks Last modified by: alokDrocks Created Date: 9/7/2011 7:47:12 PM Document presentation format – PowerPoint PPT presentation

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Title: Wireless Sensor Networks Using ZIGBEE


1
Wireless Sensor Networks Using ZIGBEE
  • Submitted By
  • Kasif Ali
  • Electronics Comm. Engineering
  • Engineering College Bikaner
  • Bikaner - Rajasthan

2
Contents
Introduction
Advantages of Wireless Sensors
Typical Wireless Sensor Hardware
Overview of ZigBee
Overview of IEEE 802.15.4
Applications
3
Introduction
  • A wireless sensor network (WSN) consists of
    spatially distributed autonomous sensors to
    monitor physical or environmental conditions,
    such as temperature, sound, vibration, pressure,
    motion or pollutants and to cooperatively pass
    their data through the network to a main
    location.
  • The WSN is built of "nodes.
  • Each such sensor network node has typically
    several parts a radio transceiver with an
    internal antenna or connection to an external
    antenna, a microcontroller, an electronic circuit
    for interfacing with the sensors and an energy
    source, usually a battery or an embedded form of
    energy harvesting

4
Advantages of Wireless Sensors
Traditional Sensing Method
  • Sensors do not have computation ability
  • Sensors do not communicate

5
Advantages of Wireless Sensors
WSN Sensing Method
  • Now, sensors become sensor nodes
  • Nodes process information and communicate it
    wirelessly

6
Typical Wireless Sensor Hardware
7
Typical Wireless Sensor Hardware
Microcontroller
  • Contains CPU, Memory and
  • Peripherals on same chip
  • Typically 8-bit or 16-bit
  • Operate at less than 20MHz
  • Memory less than 128kB
  • Low power consumption to
  • ensure long run times

8
Typical Wireless Sensor Hardware
  • Radio Transceiver
  • Typically operate in the ISM bands
  • Use various modulation techniques
  • QPSK, BFSK, GFSK
  • Low Output Power 0dBm or 1mw
  • Low Range around 10-300 feet

9
Typical Wireless Sensor Hardware
  • Sensors
  • Temperature
  • Humidity
  • Atmospheric Pressure
  • Light
  • Acceleration ( Accelerometer )
  • Angular Rate ( Gyroscope)
  • Strain

10
Overview of ZIGBEE
  • Zigbee is a technology developed as a global
    standard to comply with the needs of low cost and
    low power wireless networks.
  • It has been designed with the facility to be able
    to provide an easy to use wireless solution which
    creates a secure and reliable network.
  • Ability to support multiple network functions
    like the point to point or multipoint to point
    and also the mesh networks as well.
  • It has the direct sequence spread spectrum as
    well.
  • It also has the ability to run for years without
    any kind of maintenance and with an automatic
    meter reading.

11
Why ZIGBEE ?
12
Zigbee Device Classes
13
How ZigBee Works
States of operation
Modes of operation
Devices
-Active -Sleep
Full Function Devices (FFDs) Reduced Function
Devices (RFDs)
- Beacon - Non-beacon
14
Overview of IEEE 802.15.4
  • Part of the 802.15 wireless PAN standard
  • Specifies the PHY and MAC layers
  • Created for low data rate and multi-month or
    multi-year battery life
  • Targeted Applications
  • Sensors
  • Interactive Toys
  • Smart Badges
  • Remote Controls
  • Home Automation

15
Overview of IEEE 802.15.4
16 Channels in 2.4GHz band 250kbps
DSSS used in all bands
IEEE 802.15.4 Specifications
2.4GHz band uses O-QPSK modulation
CSMA-CA channel access
Two addressing modes supported
16
Wireless Technology Comparison
Standard Bandwidth Power Consumption Protocol Stack Size Stronghold
Wi-Fi Up to 54Mbps 400mA TX Sleep 20mA 100KB High Data Rate
Bluetooth 1Mbps 40mA TX Sleep .2mA 100KB Interoperability Cable Replacement
Zigbee 250kbps 30mA TX Sleep .003mA 32KB Long Battery Life, Low cost
17
Applications
HVAC Systems
Agricultural
Applications
Monitoring condition of Machinery
Home Automation
Area Monitoring
Structural Monitoring ( Bridges, Buildings)
18
Thank You !
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