1, Bluetooth (Bluetooth?): is a wireless technology standard that enables short-range data exchange (using UHF radio waves in the ISM band at 2.4~2.485GHz) between fixed devices, mobile devices, and building personal area networks. Bluetooth technology was originally created by telecom giant Ericsson in 1994 as an alternative to the RS232 data line. Bluetooth allows multiple devices to be connected, overcoming the challenges of data synchronization.

2. Bluetooth is a packet-based protocol with a master-slave architecture. A master device can communicate with up to seven slave devices in the same micro-micro network. All devices **** enjoy the master device's clock. Packet switching is based on a base clock defined by the master that runs at 312.5?s intervals. Two clock cycles form a 625?s slot, and two time gaps form a 1250?s gap pair. In the simple case of single-slot packet sealing, the master device sends information in even-numbered slots and receives information in odd-numbered slots. The opposite is true for slave devices. The packet sealing capacity can be as long as 1, 3, or 5 time gaps, but in either case, the master device starts transmitting from the even-numbered slots, and the slave device starts transmitting from the odd-numbered slots.

3, the goal is to achieve the highest data transmission speed of 1Mbps (effective transmission speed of 721kbps), the maximum transmission distance of 10 meters, the user does not have to be permitted to use the 2.4GHz ISM (industrial, scientific, medical) band, in which the establishment of 79 bandwidth for the 1MHz channel, with the frequency of switching 1,600 times a second, hobbing () method. Hobbing) way of spectrum diffusion technology to realize the sending and receiving of radio waves. This is the origin and characteristics of Bluetooth technology.