OFweek semiconductor lighting Reuters Our country is a scarce national resource, but in everyday life, people do not realize it. Taking indoor lighting as an example, manual switches are used in many public places, and there is often a phenomenon that lights are not turned off in time, thereby causing waste of energy and shortening the service life of the lamps. In response to this phenomenon, it is necessary to study an intelligent lighting control system. The system uses intelligent sensors to sense the outdoor brightness to automatically adjust the light to maintain a constant illumination in the room, which can not only achieve the best lighting environment in the room, but also achieve energy-saving effects.
The LED is called the fourth generation green light source, and the LED light-emitting device is a cold light source, which has the characteristics of energy saving, environmental protection, long life and small volume.
LED light has good monochromaticity, narrow spectrum, no filtering, and can directly emit colored visible light. In the same lighting situation, LED lamps consume one-tenth of the energy of incandescent lamps, and one-half of fluorescent lamps are the future development trend of lighting.
Intelligent control scheme design
The system uses a photoresistor to detect the ambient brightness, the pyroelectric infrared sensor detects the trace infrared of the human body radiation, and the temperature detection module detects the temperature of the LED. The signal detected by the sensor is preprocessed and transmitted to the single chip microcomputer, and the switch and brightness of the LED lamp are controlled after being processed by the single chip microcomputer. . The system block diagram is shown in Figure 1.
Figure 1 system block diagram
hardware design
1. Pyroelectric infrared detection module
The pyroelectric infrared detection module does not need to be equipped with an infrared emission source, and can directly receive a small amount of infrared radiation radiated by the human body, and converts it into a corresponding electrical signal output. In order to improve the sensitivity of the PIR sensor to the infrared ray, a Fresnel lens is assembled in front of the sensor.
The pyroelectric infrared detecting module is composed of a Fresnel lens, a pyroelectric infrared sensor (PIR), a control circuit and a driving circuit. The block diagram of the pyroelectric infrared detection module is shown in Figure 2.
Figure 2 Pyroelectric infrared detection module block diagram
The human body has a constant body temperature, generally at 37 ° C, will emit infrared light of a specific wavelength of about 10 μm. The infrared light radiated by the human body is collected by the Fresnel lens on the two detector elements of the PIR. When the human body moves, the intensity of the infrared radiation changes, the charge intensity of the surface of the probe changes, and the signal is output through the internal FET amplification. .
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