talked about the concept of PWM dimming and the mainstream zigbee protocol , so today we continue to talk about the Bluetooth protocol of PWM dimming.
Bluetooth was developed under IEEE 802.15.1 to provide wireless communication through radio signals. Bluetooth supports frequencies ranging from 2.4 GHz to 2.483 GHz. It covers shorter distances than Zigbee. In Bluetooth, GFSK modulation technology is used. The transmission rate of Bluetooth is faster than Zigbee, but the coverage distance is not as far as Zigbee.
In the early days of Bluetooth, there were up to 8 nodes. If there were more nodes, it would basically be disconnected or unable to connect. The current mesh solution allows Bluetooth devices to communicate with each other, and the transmission distance has also been increased from the previous 10 meters to 30 meters, but the overall connection The stability is worse than zigbee, including the number of not as many as zigbee65000. More importantly, the power consumption of Bluetooth is much higher than that of zigbee. However, the advantages of the Bluetooth solution are also obvious. It can be connected directly without a gateway. If a large range and a large number of devices are required, a gateway is required to communicate with each other. Due to the superiority and stability of the Bluetooth solution, more and more Bluetooth control devices are now available to everyone. For example, the previous infrared remote control has become a Bluetooth remote control. Infrared can only control the switch of functions and cannot perform calculations, while 2.4g, Bluetooth, and zigbee can perform more functional applications, such as infinite dimming and color matching. One of the biggest advantages of Bluetooth is that it is cheap. The price is close to 1/3 of Zigbee. This is also the main reason why Bluetooth solutions have recently begun to be widely used in small-scale scenarios. With a small range and a small number of devices, there is no need to use the high-priced Zigbee solution.
