Using CSR mainstream Bluetooth chip, Bluetooth V2.0 protocol standard; input voltage: 3.6V - 6V, prohibited more than 7V; baud rate of 1200, 2400, 4800, 9600, 19200, 38400, 57600, 11520.
The Bluetooth technology actually has more than one "class Bluetooth technology actually comes in multiple "categories", i.e. different versions of the core specification. The most common are Bluetooth BR/EDR (i.e., Basic Rate/Enhanced Data Rate) and Bluetooth Low Energy (Bluetooth Low Energy) technologies. Bluetooth BR/EDR is mainly used in Bluetooth version 2.0/2.1, and is generally used in products such as loudspeakers and headsets;And the Low Energy Bluetooth technology is mainly used in Bluetooth version 4.0/4.1/4.2. It is mainly used in the latest products on the market, such as bracelets, smart home devices, automotive electronics, medical devices, Beacon sensors (small transmitters that send data via Bluetooth technology), and so on.
Expanded Information
The Bluetooth master device can communicate with up to seven devices in a pico network (an ad hoc network of computers using Bluetooth technology), though not all devices will be able to reach this maximum number. Devices can switch roles via the protocol, and slaves can switch to masters (e.g., if a headset initiates a connection request to a cell phone, it is naturally the master as the initiator of the connection, but may then operate as a slave).
The Bluetooth core specification provides two or more pico-mesh connections to form a distributed network, allowing specific devices to automatically and simultaneously play the roles of master and slave, respectively, in these pico-mesh networks.