Development and course of Bluetooth Technology

bluetooth , A short-range wireless communication technology standard , from 1998 Established in “ Bluetooth special interest group ”(Special Interest Group,SIG) Named to integrate the standards of major brands ,SIG It is the predecessor of Bluetooth Technology Alliance . With the development of wireless technology , The Internet of things application market is booming , Bluetooth technology also plays an irreplaceable role and continues to improve . It takes about 20 A year , So far, the Bluetooth module has also changed from the original 1.0 Version update to 5.3 edition , There are five versions . Bluetooth technology first appeared to replace cables between devices and solve the problem of incompatible mobile device data transmission ,

1999 Officially announced in 1.0 edition , Be sure to use 2.4GHz spectrum , Maximum data transmission speed 1Mbps, After the launch , At that time, there were few devices with Bluetooth function and the price was relatively high , Only high-end devices such as mobile phones are equipped .

After several years of development ,SIG More members than 2000 home , Electronic devices using Bluetooth technology have mushroomed , Prices have also fallen significantly . In order to broaden the application level and transmission speed of Bluetooth module , because 1Mbps Wireless transmission speed of , Its effective data transmission speed is about 723.2kbps.SIG Launched successively 1.2、2.0 Version and other additional new features , for example EDR（Enhanced Data Rate, coordination 2.0 Technical standards of , Increase the maximum transmission speed to 3Mbps）、A2DP（Advanced Audio Distribution Profile, A control track Allocation Technology , Mainly used in stereo headphones ）、AVRCP（A/V Remote Control Profile） etc. .Bluetooth 2.0 Increase the transmission rate to 2Mbps、3Mbps, Far greater than 1.x Version of 1Mbps. At this time , There are more electronic devices using Bluetooth modules , Including mobile phone 、 The notebook 、 Many mobile devices such as desktop computers and wireless headphones 、 Wireless speakers 、 mouse 、 keyboard 、 Printers and other peripherals .

These are the first three generations of Bluetooth Technology Standards , The main feature is wireless high-speed data transmission between devices , Such as music 、 video 、 Documents, etc. , short distance , High power consumption . At the same time, it also establishes one-to-one device communication based on point-to-point network topology .

For example, middle-aged wireless meter reading in Internet of things 、 Button battery applications such as gas detection and low-power devices such as smart bracelets , There is a need for low power consumption .2010 year 7 month 7 Japan , Bluetooth Technology Alliance launched blue module 4.0 Protocol specification . Its most important feature is to support power saving . And later 4.1、4.2 Bluetooth transmission protocol version , Supporting multi device connection is an important progress of Bluetooth in the Internet of things , You can use Bluetooth devices to form a star network .

Bluetooth module 5.0 The agreement 2016 year 6 Published in . The effective transmission distance will be 4.2LE Version of 4 times , The transmission speed will be 4.2LE Version of 2 times （ The speed limit is 24Mbps）. bluetooth 5.0 It also supports indoor positioning and navigation （ combination WiFi It can achieve the precision less than 1 Indoor positioning of meters ）, Allow data to accept beacons without pairing （ Like advertising 、Beacon、 Location information, etc , The transmission rate is improved 8 times ）, There are many underlying optimizations for the Internet of things . meanwhile , Support bluetooth mesh For mesh network topology , Different from the fourth generation Bluetooth star network , Make smart cities in the Internet of things 、 Further in smart home and other applications .

With the development of Internet of things applications , face IOT market , Bluetooth technology is also growing rapidly . At power consumption 、 Number of connections 、 Transmission speed and distance 、 Security and other aspects show their strength .

 https://www.ebyte.com/new-view-info.html?id=1918;