The working principle of five common sensor lights:
1. Light switch The light switch is often used in some nights where automatic lighting is needed, such as the front lights of the courtyard, street lights on urban roads, etc. It is mainly through a light -sensitive resistance (its resistance can be changed according to the strength of the light); when the light that is strong on the light resistance is strong, its resistance value will become lower, the back -end circuit does not work, and the light will not work. Bright; when the light that is shining on the light resistance is weak, its resistance value will become higher, and the back -end circuit works to make the light light up. Its shortcomings are that when it is in a dark environment, the switch will continue to be turned on, the lights will be lit, and precise control cannot be achieved. The energy saving effect is not ideal; it is easy to be affected by dust or obstacles. 2. Voice control switch The sound control switch is also an earlier automatic control method. It is usually used in the corridor, aisle, corridor and other places. It effectively avoids the effects of dust and obstacles on the effect of use. Its working principle is also very simple. The sound signal is collected through the head (microphone's wheat vulgarity), and then the back -end circuit processing is processed to control the switching and turnover to achieve the light turnover of the lights. Usually we also add a delay circuit based on the voice control switch to achieve the sound sound and light on the light. After a short period of time, the light is automatically turned off. 3. Human sensing switch The human sense switch has been further improved on the basis of sound control. It can achieve the light opening action when quietly. It is mainly composed of a thermal release sensor Garfinier lens and peripheral control circuit. Its working principle is that thermal release sensor can sense thermal radiation released by the human body temperature, and the Phyl lens can collect and focus on the release of infrared rays. When someone appears within the inductive range, the infrared radiation of the human body's heat released by the Phyl lens focuses on the thermal release sensor, and then outputs a control model from the thermal release sensor Essence 4. Microwave switch Microwave induction (also known as radar induction) is much more perfect than the previous control methods. Now it is widely used in underground garage, road lighting and other places. It uses a radar -like working principle to launch a microwave to detect the mobile objects, and then generates corresponding switching operations. It has strong anti -radio frequency interference capabilities, no temperature, humidity, light, airflow, dust, etc., and can be installed in a certain thick non -metallic shell without exposure. Overall coordination and beauty (microwave induction lamps can be exactly the same as ordinary lamps). 5. LED infrared induction Sensor Light lighting The LED infrared motion sensing lighting lights use the human body induction element of the lamp head to pass the circular Fresnel filter to focus on the surface of the inductive component to generate an electric signal. The module comprehensive processing and analysis are turned on and turned off in the detection value. The thermal sensing module in the three major modules is responsible for detecting the hot infrared rays of the human body, the delayed switch module is responsible for handling the length of the lighting time, and the light sensing module is responsible for detecting the strength of the light. 
