Bluetooth 4.0Bluetooth 4.0Low EnergyLow Energy

Advisor:Lian-Jou TsaiStudent:Mu-Ting Huang

OutlineOutline• Motivation• Abstract• Introduction Bluetooth

o Classico 3.0+HSo 4.0o BLE

• Introduction Zigbee• What’s different• What’s BLE good for• How does BLE work• In future• Conclusion• References

MotivationMotivation

• Study of feasibility for home automation base on Bluetooth 4.0

AbstractAbstract

• Development of home automation in the past have required expensive hardware to support the required protocols, hope this article via Bluetooth 4.0 technology to create a low-cost, highly convenient home automation systems.

Classic BluetoothClassic Bluetooth• 2.0+EDR 、 2.1+EDR

• 2.4 GHz ISM band, 80 Channel

• 1~3 Mb/s, <30mA max current

• Up to 100mW, more than 100m range

• Used for mobile 、 headphone 、 keyboard…

Bluetooth 3.0+HSBluetooth 3.0+HS• Support IEEE 802.11 PAL

• Up to 24Mb/s

• Power control

• Used for transfer big file

Bluetooth 4.0Bluetooth 4.0• 2.4 GHz ISM band, 40 Channel

• 1 Mb/s , <15mA max current

• ~10mW , 50m range

• Three mode(Classic 、 High Speed 、 Low Energy)

• Used for mobile 、 watch 、 sport 、 Home Automation …

BLEBLE• It doesn’t support stream.

• It not optimised for file transfer.

• It is designed for sending small chunks of data.(like command or state)

Small data 、 less transfer time 、 deep sleep 、 low-power…

ZigbeeZigbee• IEEE 802.15.4 , 868 / 915 MHz / 2.4GHz

• 100~200m range

• 20kb/s~250kb/s

• Short distance 、 slow speed 、 low-power 、 low cost

What’s different?What’s different?

BLE Zigbee

Radio Frequency 2.4 GHz 2.4 GHz

Range 10~100 m 10~200 m

Data rate 1Mb/s 250kb/s

Time to send data <3ms <10ms

Output power 1uW~15mW 1mW~100mW

What’s BLE good for?What’s BLE good for?

• BLE is already in PCs or mpbile phones.

• Zigbee is low power, but BLE is lower.

• BLE is simple to connecting

How does BLE work?How does BLE work?• 2.4GHz ISM band• 40 Channels on 2MHz spacing

How does BLE work?How does BLE work?• To broadcast promiscuously• To transmit signed data to a previously bonded

device• To advertise their presence to a device wanting to

connect• To reconnect asynchronously due to a local event

How does BLE work?How does BLE work?• Master informs slave of hopping sequence and when to

wake• All subsequent transactions are performed in the 37 data

channels• Transactions can be encrypted• Both devices can go into deep sleep between transactions.

How does BLE work?How does BLE work?• 4 active states

How does BLE work?How does BLE work?• Client

• Host

Support BLE devicesSupport BLE devices

In futureIn future• Lock door when I leave home

• Turn off alarm off I’m already wake up

• Turn on the light when I walk around the house

• Control TV

ConclusionConclusion

• Bluetooth 4.0 short distance, low-power, low cost, suitable for a small amount of data transfer can be used for home automation.

• Automatic notification master slave’s status, more easy to control home appliances situation.

ReferencesReferences• 傳統 BT 與 BLE 有什麼不一樣？

• （ http://wjungle.blogspot.tw/2012/01/btble.html）

• 陳泰全 . " 藍芽系統之省電方式研究與改善 ." 臺北科技大學電腦與通訊研究所學位論文 2011 年 (2011): 1-48.

• Bluetooth 4.0:Low Energy• （ chapters.comsoc.org/vancouver/BTLER3.pdf ）

• Zigbee wiki• （ http://zh.wikipedia.org/wiki/ZigBee ）

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