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WirelesssensornetworksNowadays,theuseofwirelesscommunicationismoreandmorewidely.NowIwilltalkaboutoneofthemostwidelyusedwirelesscommunication--BlueTooth.WhatisBlueTooth?BlueToothisakindoftechnologythatsupportshortdistancewirelesscommunication.Itisdividedintotwokinds.Oneisclass1thatthetransmissiondistanceis100meters,theotherisclass2thatthetransmissiondistanceis10meters.BlueToothstandardistheIEEE802.15.Bluetoothworksat2.4GHzanditsbandwidthupto3Mb/s.Theconvenienceofbluetoothareasfollows:Firstofall,theuseofBlueToothmakesthetransmissionveryconvenient.Wecantransmitdatawenandwhere.Secondly,BlueToothiswireless.Thismakeusnoneedtocarrydatalineanymore.Thirdly,theuseofgreatlyconvenientthedriversbyusingthevehicleBlueToothsystemsothattheycanmakecallswhendriveacar.BlueToothalsohasmanyadvantagesoverotherstyleofwirelesscommunication.Aboveall,BlueToothhastheon-offfunctionandthestateofcanbefound.Secondly,BlueToothhassecuritySettings.Bluetoothneedtomatch,afterthesuccessofthepairscantransmitdata.Thirdly,BlueToothtransmitveryfast.Transmissionratecanreach2.4GHz.Ontheotherhand,BlueToothalsohassomeshortages.Inthehomeautomationandindustrialtelemetryremotesensing,Bluetoothseemstoocomplex,powerconsumption,fromthepast,networksizeistoosmall.Otherwise,thehighpriceofBluetoothimpacttheusingwillofcustomers.Bluetoothiswidelyusedinourdailylife.Asisknowntousall,mostofthemobilephones,notebooksandsomecarshavethefunctionofBlueTooth.IbelievemostoftheyouthmusthavetheexperienceofusingBlueTooth.Everycoinhasitstwosides,BlueToothalsohasitsadvantagesanditsdisadvantage,too.Bluetoothismostusedonmobilephone,computerandotherdigitaldevicestheseyears.IthinktherearemanyplaceswhereBluetoothcanbeused.IbelieveBluetoothhasabroadapplicationprospect.First,Bluetoothcanbeusedonawirelesselectroniclocks.Thiskindoflockhasahighersecurityandapplicability.Ithinkthiskindlockisverysuitforcars.PeoplecanuseBluetoothremotecontroltolockorunlockthecar.Bluetoothremotecontrolwillbemorepowerfulthanotherremotecontrols,forexsampleinfraredremotecontrol.Second,wecanuseBluetoothtobuildourelectronicpurses.Whenwegoshoppingwecanpaythebillwithoutpullingoutourpurses.Thecashierdeskwilldetectyourcreditcardanddeductedyourbillautomatically.Inthiswaywecangotoashop,ahotel,aairlinecompanyorarestaurantwithease.Third,Bluetoothsystemcanbeusedinourhouseholdelectrics.WecanputBluetoothsystemintomicrowaveoven'ssystem,washingmachine'ssystem,refrigerator'sandair-condition'ssystems.Inthisway,wecanusearemotecontroltocontrolallthehouseholdelectrics.AndtheBluetoothsystemofeveryelectriccanfeedbackitsinformationtonetworkatanytime.Themastcanknowtherunningstateandcontrolhiselectricswhenandwhere.Insummary,Bluetoothhasbeenwidelyusedinourlife.AndIbelievetheuseofBluetoothwillbemoreandmorewidely.IalsobelieveBluetoothhasabroadprospect.MaybesomeofuscandevotingthemselvestostudyBluetoothtechnologyinthenearfuture.