What is the main technology of Bluetooth?

1, Bluetooth (Bluetooth? ): is a wireless technical standard, which can realize short-distance data exchange between fixed equipment, mobile equipment and personal area network of buildings (using UHF radio waves in ISM band of 2.4 ~ 2.485 GHz). Bluetooth technology was first invented by telecom giant Ericsson in 1994 as a substitute for RS232 data line. Bluetooth can connect multiple devices, which overcomes the problem of data synchronization.

2. Bluetooth is a packet-based protocol with a master-slave architecture. In the same piconet, the master device can communicate with up to seven slave devices. All devices * * * enjoy the master clock. Packet switching is based on the protocol defined by the master device, and the protocol is 3 12.5? S is the basic clock that runs at regular intervals. Two clock cycles form a 625? S slot, two time gaps form a 1250? The gap of s is right. In the simple case of single slot grouping, the master device sends information in even slots and receives information in odd slots. Slave devices are just the opposite. The packet size can be as long as 1, 3 or 5 slots, but in either case, the master will start transmission from even slots and the slave will start transmission from odd slots.

3. The goal is to achieve the highest data transmission speed 1Mbps (effective transmission speed 72 1kbps) and the maximum transmission distance 10 meter. Users can use the ISM (Industrial, Scientific and Medical) band of 2.4GHz without permission, and set 79 channels with the bandwidth of 1MHz on it, switching 1 MHz every second. This is the origin and characteristics of Bluetooth technology.