What is Bluetooth?
Bluetooth is a kind of wireless short-distance transmission. There are 79 frequency bands. The working frequency range is 2402-2480MHZ. Usually, the transmission distance is about 10 meters, and there are also long distances. After more than 10 years of rapid development, Bluetooth technology is very mature and widely used in various products, especially digital products. Mainly used in mobile phones, computers, Bluetooth headsets / audio, Bluetooth bracelets, smart home and other aspects.
How powerful is Bluetooth?
Compared with the WiFi wireless network technology similar to the working frequency band of the Bluetooth communication technology, the Bluetooth communication technology has the advantages of power saving, stable transmission, small size, and security in various devices. In the smart home equipment system, traditional home electrical equipment can be connected to the local area network to facilitate simultaneous interaction and control, but most of the smart devices are not suitable for high bandwidth, compared to the high power consumption of WiFi communication technology. In this way, smart LED lights, smart switches, smart sockets, air conditioners, kitchen appliances, purification/humidification equipment, etc. are more suitable for Bluetooth transmission. And only one Bluetooth device can control all smart homes, and all the smart home systems can abandon the more complicated WiFi connection and switch to the Bluetooth communication protocol with low power and low power consumption.
The difference between the various versions of Bluetooth
Bluetooth 1.0: The transfer rate is approximately 1M/s.
Bluetooth 2.0+EDR: The transmission rate is about 2-3M/s, of which 2.1+EDR is the most classic Bluetooth. The biggest feature is safe and easy pairing.
Bluetooth 3.0+HS (High Transmission Bluetooth): High transmission 24M/s, only devices marked with the “+HS” trademark truly support 802.11 high-speed data transmission.
Bluetooth 4.0 (Low Power Bluetooth): It includes Classic Bluetooth, High Speed Bluetooth and Bluetooth Low Energy Protocol, which consumes less power on a 3.0 basis and is targeted at applications that require very low power consumption and are powered by button batteries. Among them, 4.1 adds IoT features and supports the coexistence of bulk data exchange rates. The biggest feature of 4.2 is that multiple Bluetooth smart devices can access LAN or Internet through one terminal.
Bluetooth 5.0: The transmission distance is longer and the function is stronger.
At present, the most widely used version on the market is 4.1. The introduction of this technology has made great strides toward the Internet of Things applications such as smart home, smart wearable devices, and smart medical care.
Bluetooth device classification
According to the different main functions of Bluetooth devices, they can be divided into the following four types:
Bluetooth Receiver: The function is to receive the Bluetooth signal. Simply put, the wired headset/sound can be turned into a Bluetooth headset/sound, so that the Bluetooth-free car stereo can be turned into a Bluetooth stereo.
The function is to transmit a Bluetooth signal, which is used in general households. For example, when the transmitter is connected to the TV, the sound can be transmitted to the Bluetooth headset without affecting others.
Bluetooth Receive Launch: As the name suggests, it is a combination of a receiver and a transmitter that allows the device to receive and receive Bluetooth signals.
USB Bluetooth adapter: Receive Bluetooth signal by plugging in the USB port of the device, such as connecting the Bluetooth mouse button, Bluetooth headset, plugging into the desktop, installing the driver, turning the ordinary computer into a Bluetooth-enabled computer.