TechnicalcomparisonbetweenBluetoothandZigBeeBelongstoWPAN(WirelessPersonalAreaNetworkCommunicationTechnologies)Thesamewirelesspersonal-areanetworks-IEEE802.15Runinthe2.4-GHzunlicensedfrequencyband(ZigBeecanalsooperateatreducedspeedsat915MHz(USA)and868MHz(Europe))SmallformfactorsLowpowerThemodulationtechniquecanalsobecalled‘airinterface’or‘radiointerface’.FHSSstandsforFrequencyHoppingSpreadSpectrumwhileDSSSstandsforDirectSequenceSpreadSpectrum.DSSSisappliedinafixedenvironment,andtransmitinhighquality,likenetworkcommunity.FHSSisappliedinfastmovingdevices,likecellmobile.ZigBee,designedtobealow-poweralternativetoBluetooth,offers30mWperformancecomparedtoBluetooth’s100mW.ZigBeeisdesignedto“runforsixmonthstotwoyearsonjusttwoAAbatteries”.Thisresultsfromitsabilitytolockintoatransmissiontimeslotandsleepinbetween.However,Bluetoothmuststayawakefortheconvenienceofquickresponsetime,whichresultsinbatterylifeontheorderofdays.NetworkSpeedBluetoothhasproceededtoreachmaximumratesof3Mbps.ZigBeeintentionallylagsfarbehindit,sacrificingdataratesforpowersavings,andsotransmitsonly20-250Kbps.Bluetootharedesignedtooperatewithina10mrange,thoughBluetooth2.1nowstatesamaximumrangeof30m.ZigBee,beingdesignedtoenable“homeandindustryautomation”,allowsamaximumrangeof75m.OneofZigBee’sgreateststrengthsoverBluetoothhasbeenitsfreedomtosleepoften.Thiscomesfromitsquickwake-from-sleepdesign.AZigBeedevice“canwakeupandgetapacketacrossanetworkconnectioninaround30milliseconds,”whileaBluetoothdevicewouldtake3seconds.Bluetoothoperateprimarilyinadhocpiconets,whereamasterdevicecontrolsmultipleslaves.Thesepiconetsarelimitedto8devices.ZigBeehasfargreaterflexibilityinthisarena,supportingmeshandstarconfigurations,asCoordinatordevicescanreroutetrafficasneeded.StarconfigurationsattheendsofthemeshallowclustersofZigBeedevicestointeractwiththeoutsideworld,whilethemeshdevicesfocusondatatransmission.StarTopologyBluetootheliminatescablingbetweenelectronicproductsandaccessories,suchasbetweencomputersandprintersorbetween