With the development of science and technology, people have more and more requirements for the convenience of life, and household intelligent devices have become the choice of more and more families. As a common equipment of home intelligence, microwave radar sensor is widely used in indoor lamp control, which brings higher security and convenience to home. This paper will introduce the light connection method of microwave radar inductor in detail.
1. Basic knowledge of microwave radar inductor
Microwave radar sensor is a kind of detector based on microwave technology. It detects the position and motion of objects by transmitting microwave signals and receiving echoes. There are two common microwave radar sensors: one is active microwave radar sensor, the other is passive microwave radar sensor. Active microwave radar sensors consume more power because they need to transmit microwave signals continuously. Passive microwave radar sensors recognize the presence of objects by monitoring the changes of microwave signals in the environment, which is relatively more power-saving.
Two, microwave radar inductor light control principle
Microwave radar sensor is widely used in the control of lamps and lanterns. Its realization principle is to judge whether the light needs to be turned on by detecting the motion state of objects. Specifically, when someone enters the range covered by the sensor, the sensor will detect the microwave signal sent by the human body, and send the signal from the internal circuit of the sensor to the chip processor for analysis. When the analysis results show that there is a human, the chip will send instructions to the electrical lighting equipment, so as to control the opening and closing of the lamp.
Three, microwave radar inductor connection method
The connection methods of microwave radar inductor are mainly divided into two kinds: parallel connection and series connection.
1. Parallel connection
Parallel connection is to connect the microwave radar sensor and the lamp respectively under the same power supply. There is no connection between the two electrical equipment to control each other, but they just follow the same line.
2. Series connection
Series connection is to connect the microwave radar sensor with the lamp. The microwave radar sensor can control the switch of the lamp.
When wiring microwave radar sensors, the following points should be noted:
1) The lamp and microwave radar sensor should be connected to the same power supply, and the power supply voltage should be matched.
2) Confirm whether the selected microwave radar inductor supports parallel connection and series connection, and the corresponding connection method.
3) Before confirming the connection, turn off the power and keep a safe distance.
4) For series connection, it is necessary to add load resistance at the sensor output point, otherwise it may lead to sensor output interference or circuit damage.
5) Need to be careful wiring, contact should be tight and stable, otherwise easy to cause circuit failure.
Iv. Application scenarios of microwave radar inductor
Microwave radar sensors are widely used in home and business because of their high sensitivity and fast response speed. The following are common application scenarios:
1. Home lighting control
Microwave radar sensors are used in home lighting control. When people approach, the lamps will automatically light up, making the living environment more comfortable and convenient.
2. Access security control
The microwave radar sensor can be used for the security control of access control. When someone enters the detection range of the sensor in front of the door, the access control and warning equipment can be automatically opened to detect abnormal situations in time.
3. Commercial security
Microwave radar sensors are also used in the field of commercial security, through shopping malls, office buildings and other public places monitoring to achieve safety management.
4. Smart home
As an important device in the field of smart home, microwave radar sensor can control the home environment and improve the comfort of home life.
In real life, in addition to light control, microwave radar sensors can also be applied to other fields, such as automatic faucets inside the toilet, automatic air cleaning and so on.
5. Advantages and disadvantages of microwave radar inductor
Microwave radar sensor has its advantages and disadvantages in application.
1. Advantages:
(1) High sensitivity and fast reaction speed.
(2) Can penetrate non-metallic objects, wide detection range.
(3) It is less susceptible to external interference than infrared sensors.
(4) Because microwave radar sensors will not cause harm to human body, it is very suitable for application in commercial, school, hospital, family and other public places.
2. Disadvantages:
(1) Relatively high price.
(2) There are certain limitations on the installation of application environment, such as microwave signal is easy to be interfered by metal objects.
(3) For some animals or small details such as wind and grass detection is not fine enough, easy to cause false positives or false detection.
(4) The quality of some brands is unstable and there are risks in the application.
To sum up, microwave radar sensors are widely used. However, it is necessary to select the appropriate connection mode, pay attention to the safe use and maintain the equipment correctly according to the specific application scenarios.
