The working principle of the common sensor light

Sensor Light is very common in daily life, whether it is in the home, office area, building or public places can see the shadow of induction lamp.

1. Light sensing switch
Light sensing switch is often used in some places that need automatic lighting at night, such as courtyard lights, street lights on urban roads, etc. It is mainly through a photoresistor (whose resistance value can change according to the intensity of the light); When the light shining on the photoresistor is strong, its resistance value will become low, the back-end circuit does not work, the lamp will not light; When the light hitting the photoresistor is weak, its resistance value becomes high, and the back-end circuit works to turn the light on. Its disadvantage is that when it is in a dark environment, the switch will continue to open, the light will always be on, can not achieve accurate control, energy saving effect is not ideal; It is easy to be affected by dust or obstacles.

2. Voice-activated switch
Voice control switch is also an early application of automatic control mode, usually used in corridors, corridors, corridors and other places, it effectively avoids the impact of dust and obstacles on its use effect. Its working principle is also very simple, through the Mi head (microphone commonly known as Mi head) to collect sound signals, and then through the back-end circuit processing, control switch on and off, realize the light on and off. Usually we will add a delay circuit on the basis of the voice-controlled switch, so that the sound sounds, the light is on, and after a short period of time, the light automatically turns off.

3. Human sensing switch
Human sensing switch is a further improvement on the basis of voice control, can be quietly in the case, the realization of the light action. It is mainly composed of a pyroelectric sensor with a garfinier lens and a peripheral control circuit. The principle is that pyroelectric sensors can sense the radiation emitted by a person's body temperature, while Fenier lenses collect and focus infrared light emitted by the body. When someone appears in the induction range, the Finier lens focuses the infrared radiation released by human heat onto the pyroelectric sensor, and then the pyroelectric sensor outputs a control model to the back circuit to realize the light on and off control.

4. Microwave switch
Microwave induction (also known as radar induction) relative to the previous several control methods is a lot of perfect, now widely used in underground garage, road lights and other places. It works like radar, transmitting microwaves to detect moving objects and then generating the corresponding switch operation. It has the ability to resist radio frequency interference, is not affected by temperature, humidity, light, air flow, dust and so on, and can be installed in a certain thickness of non-metallic shell, without exposure, while realizing the induction function, but also can maintain the overall coordination and beauty of the appearance (microwave induction lamps can do and ordinary lamp appearance is the same).

5.Led infrared induction lighting
The LED infrared dynamic and static induction lamp uses the human sensor element in the lamp cap, and passes through the circular Fresnel filter to focus the thermal infrared ray on the surface of the sensor element and generate electrical signals. After the comprehensive processing of the signal processing module, the delay switch module and the optical induction module, it analyzes whether the human sensor lamp is on and off under the detected value. Among the three built-in modules, the thermal response module is responsible for detecting human thermal infrared, the delay switch module is responsible for processing the duration range of the light on, and the light induction module is responsible for detecting the intensity of light.
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