For a long time in the past, the detection technology of human body existence is almost blank in the field of civil application. Whether it is infrared sensor or radar sensor, human body movement is needed to detect it. In the actual application experience, for example, when people spend a long time reading, meditating or playing with mobile phones, they will wrongly judge that no one exists and then execute the instruction to turn off the light, resulting in poor user experience. In addition, in order to solve this phenomenon, thermopile or millimeter-wave radar technology is also used in the market to realize the sensing scene of the human body, but due to its high cost, it is difficult to promote and apply.
Use technology to achieve clever design
Recently, the low cost microwave radar sensor module human sensing program 5.8GH program has been launched, which successfully realized the detection of human presence. The new three core technologies in the field of human sensing to increase the detection function of human sensing, to help users improve the experience.
1, the use of cross-polarization, high isolation onboard plane dual antenna. The antenna is sensitive enough to detect tiny movements, such as the ups and downs of a human keyboard, and the process is simple and consistent.
2, using advanced software algorithm, in a variety of complex waveform, effectively extract the weak waveform generated by human body fluctuation, so as to effectively judge whether there is human body within the detection range. While extracting effective breathing signals, other disturbances are also shielded by the algorithm, such as exhaust fan rotation, distant people, rotary machines, etc.
3, microwave radar induction module adopts system integration chip technology, high consistency. Frequency point can be set and random frequency hopping technology can be supported to effectively avoid RF interference such as Bluetooth, WiFi and 5G signals.
Application scenario Multi-point flowering
1. Office
When the personnel enter the office, through the big action test, lights, personnel sit down or micro breath test, judge whether the personnel leave, make sure whether to turn on the lights, air conditioning, etc., to achieve real intelligence.
2. Bed judgment
It is used to judge whether people in nursing homes, hospitals and schools go to bed or not
3. Hotel room application
The microwave radar sensor module will keep the power on when it detects the presence of personnel, and turn off the power when it detects the absence of personnel, so as to realize the power supply without inserting the card.
Type of intelligent sensor switch
1. Switch of microwave radar sensor module
Microwave radar sensor uses Doppler principle to transmit and receive high frequency microwave signal (accurately perceive the movement of objects), through signal amplification and intelligent identification of single-chip microcomputer program control load lamp on (on) and off (off).
2. Infrared sensor switch
Infrared detection circuit. Infrared signal processing circuit. Signal output control switch circuit. The power supply circuit consists of several main components. Infrared signal processing integration mainly completes infrared signal processing, circuit power supply according to the requirements of each part of the circuit, to ensure the stability of the circuit, infrared induction switch has the advantages of long detection distance, wide application range, strong anti-interference ability, stable performance, etc..
3. Human body sensor switch
It is an automatic control product based on infrared technology. When someone enters the sensing range, special sensors detect changes in the body's infrared spectrum and automatically connect the load. If people do not leave the sensing range, the load will continue to connect; When people leave, the automatic shutdown load will be delayed. The lights go on when people arrive and go off when they leave. It is kind, convenient, safe, energy saving, showing humanized care.
Electromagnetic induction switch
Using the basic principle of electromagnetic induction, generally used in industrial, housing and other circuit control. Electromagnetic induction switch is a contactless switch that can also be used in elevators, elevators and other control systems to ensure safe operation and accurate stop. It is actually a monostable flip-flop, the circuit is steady when there is no inductive pulse signal.
5. Photoelectric induction switch
Non-contact reflection induction, intelligent computer detection of close distance reflection object (palm), automatic switch working state, active infrared working mode, put your hand on the sensor designated part 0.5 seconds, switch connected (or disconnected), and always maintain the state; When induction again, it will become the opposite condition, disconnect (or connection), and always maintain state, can penetrate glass, especially suitable for the kitchen cabinet lights, install non-contact induction switch in the kitchen, cooking to avoid open to turn off the lights with the hand, and will switch on the front panel of bacteria to the diet, good stability, strong anti-interference, can prevent the sunlight infrared interference, wide load capacity.
