Bluetooth, a short-range wireless communication technology standard, first appeared to replace cables between devices and to solve the problem of incompatible mobile device data transmission. The “Bluetooth Special Interest Group” (Special Interest Group, SIG) established in 1998 is named to integrate the standards of major brands. SIG is the predecessor of the Bluetooth SIG.
With the development of wireless technology, the Internet of Things (IoT) market is booming, and Bluetooth wireless communication technology also ZIGBEE Module plays an irreplaceable role in it and is constantly improving. After about 20 years, the Bluetooth module has also been updated from the original 1.0 protocol version to the 5.3 transmission protocol version, with a total of five versions.
Bluetooth wireless communication technology
Bluetooth 1.x, 2.x, 3.0 wireless transmission protocol
In 1999, the Bluetooth 1.0 version was officially announced, and it was determined to use the 2.4GHz spectrum with a maximum data transmission speed of 1Mbps. After the launch, there were very few devices corresponding to the communication function of the Bluetooth module at that time, and the price was relatively high, and only high-end devices such as mobile phones were equipped. After several years of development, there are more than 2,000 SIG members, and electronic equipment using Bluetooth technology has mushroomed, and the price has also dropped significantly. In order to expand the application level and transmission speed of Bluetooth, because of the wireless transmission speed of 1Mbps, its effective data transmission speed is about 723.2kbps. SIG has successively launched versions 1.2, 2.0 and other additional new features, such as EDR (Enhanced Data Rate, which, in line with the 2.0 technical standard, increases the maximum transmission speed to 3Mbps), A2DP (Advanced Audio Distribution Profile, a control track distribution technology, mainly applied to stereo headphones), AVRCP (A/V Remote Control Profile), etc. Bluetooth 2.0 increases the transmission rate to 2Mbps and 3Mbps, far greater than the 1Mbps of version 1.x.
The first three generations of Bluetooth technology standards, namely 1.x, 2.x, and 3.0 transmission protocols, are mainly characterized by wireless high-speed data transmission between devices, short distances, and high power consumption. The main application is: establishing a one-to-one device connection with a point-to-point network topology to transmit audio, video, files, etc. Bluetooth Module Generally, mobile devices such as mobile phones, computers, and tablets are used as central devices, and wireless headsets, wireless speakers, mice, keyboards, and printers are used as peripheral devices. Due to the high power consumption, the device is limited to rechargeable battery devices with a certain capacity.
Bluetooth Module IoT Application
Advanced: Fourth-generation Bluetooth transmission protocol
On July 7, 2010, the Bluetooth SIG launched the Bluetooth 4.0 transmission protocol specification, the most important feature of which is to support ultra-low power consumption, and subsequent versions 4.1 and 4.2. Ultra-low power consumption enables long-term connections between devices, so that a Bluetooth module device carrying an ordinary coin cell battery can work for several years.
From home appliances and fitness trackers to health sensors and medical innovations, button-type battery applications such as wireless meter reading and gas detection, and low-power devices such as smart bracelets, all require low power consumption. Supporting multi-device connection is an important progress of Bluetooth in the Internet of Things, and the use of Bluetooth devices can form a star network.
Bluetooth module technology application
Fifth generation Bluetooth wireless transmission protocol
The Bluetooth 5.0 transport protocol was released in June 2016. The effective transmission distance will be 4 times that of the BLE version of the 4.2 protocol, and the transmission speed will be 2 times that of the 4.2 BLE version (the speed limit is 24Mbps). Bluetooth 5.0 also supports indoor positioning and navigation function (indoor positioning with an accuracy of less than 1 meter can be achieved in combination with the WiFi module), allowing data from beacons (such as advertisements, Beacon, location information, etc., to be received without pairing, and the transmission rate is increased by 8 times). There are many low-level optimizations in networking. At the same time, it supports mesh network topology such as Bluetooth module mesh ad hoc network. Unlike the star network of the fourth-generation Bluetooth module, it enables Bluetooth module 5.0 transmission protocol devices to act as signal relay stations for each other, so as to transmit signals to infinite Far. This makes it a step further in applications such as smart cities and smart homes in the Internet of Things.
IoT Application Iot Market
With the development of the Internet of Things, in the face of the IoT market, Bluetooth technology is also growing rapidly. It shows its strength in various aspects such as power consumption, number of connections, transmission speed and distance, and security. The ever-expanding category of connected things that support Bluetooth devices ensures that Bluetooth technology remains the number one technology for the Internet of Things.
Tags: Bluetooth Module
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