4 Working Principles of Motion Sensor Flood Light

There are many different types of induction Motion Sensor Flood Light on the market. According to the induction principle, they can be roughly divided into 4 types of induction switches: light-sensing switches, voice-activated switches, human-sensing switches, and microwave switches. These four switches can be used alone or combined with each other to become a multi-function Exterior Motion Flood Light, such as our common sound and light control sensor lights, light control infrared sensor lights, light control microwave sensor lights,Security Lights and so on.

1. Light Sensor Switch

Light sensor switches are often used in places that require automatic lighting at night, such as courtyard door headlights, street lights on urban roads, etc. It mainly passes through a photoresistor (its resistance value can be changed according to the light intensity); when the light shining on the photoresistor is strong, its resistance value will become lower, the back-end circuit does not work, the lamp will not Bright; when the light shining on the photoresistor is weak, its resistance value will become higher, and the back-end circuit will work to light up the light. Its disadvantage is that when it is in a dark environment, the switch will continue to be turned on, and the light will always be on, which cannot achieve precise control, and the energy saving effect is not ideal; it is easily affected by dust or obstacles.

2. Voice Switch

Voice-activated switch is also an earlier automatic control method, usually used in corridors, aisles, corridors and other places, it effectively avoids the impact of dust and obstacles on its use effect. Its working principle is also very simple. The sound signal is collected through the microphone head (the microphone of the microphone is commonly known as the microphone head), and then processed by the back-end circuit to control the on and off of the switch to realize the on and off of the light. Usually, we also add a delay circuit on the basis of the voice-activated switch, so that the sound will sound, the light will be on, and after a short period of time, the light will automatically turn off.
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3. Human Touch Switch

The human-sensing switch is further improved on the basis of voice control, which can realize the light-on action without any sound. It is mainly composed of a pyroelectric sensor Garfiner lens and a peripheral control circuit. Its working principle is that the pyroelectric sensor can sense the thermal radiation released by the human body temperature, and the Fresnel lens can collect and focus the infrared radiation released by the human body. When someone appears in the sensing range, the Fresnel lens focuses the infrared radiation released by the body heat onto the pyroelectric sensor, and then the pyroelectric sensor outputs a control model to the back-end circuit to realize the light on and off control. .

4. Microwave Switch

Microwave induction (also known as radar induction) is much more perfect than the previous control methods, and is now widely used in underground garages, road lighting and other places. It adopts a working principle similar to radar, detects moving objects by emitting microwaves, and then generates corresponding switching operations. It has strong resistance to radio frequency interference, is not affected by temperature, humidity, light, airflow, dust, etc., and can be installed in a non-metallic shell of a certain thickness without being exposed. Overall coordination and aesthetics (microwave induction lamps can be made exactly the same as ordinary lamps).

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