Sensors have long been ubiquitous, long before the Internet and the Internet of Things (IoT). It is like the human five senses, as an important part of modern information technology, it is the main way and means for human to obtain information in the natural and production fields.

Recently, a fire broke out in the China Telecom Building in Changsha, Hunan Province. According to the video on the Internet, thick smoke billowed from the scene, and some items with fire were falling. The dozens of floors burned violently, and only about 10 minutes passed after the people in the building escaped. , the fire has spread to the upper floors, but fortunately no one was injured.

LED fill light includes switching power supply, LED light source controller, heat dissipation fins, housing, aluminum substrate and LEDs arranged in two rings with the center of the aluminum substrate as the center, each LED is equipped with a condenser lens

​ LoRa technology occupies an important position in the development of the Internet of Things. Because of its ease of construction and deployment, it has become a commonly used Internet of Things dedicated network communication technology. In recent years, due to the maturity of LoRa technology in the leading position, as well as the characteristics of long transmission distance, low power consumption and strong anti-interference, LoRa modules are widely used.

With the development and changes of social and economic structure, family demographic structure and information technology and the improvement of human requirements for the safety, comfort and efficiency of the home environment, the demand for intelligent home furnishing has greatly increased, and more and more family requirements Smart home products not only need to meet some basic needs, but also require smart home systems to be simple, convenient and safe in terms of function expansion, extension and even services.