光敏电阻又称光导管，常用的制作材料为硫化镉，另外还有硒、硫化铝、硫化铅

Photoresistors are also known as light pipes. Commonly used materials are cadmium sulfide. In addition, there are materials such as selenium, aluminum sulfide, lead sulfide, and bismuth sulfide. These materials have the characteristic that their resistance decreases rapidly under the irradiation of light of a specific wavelength. This is because the carriers generated by the light are involved in conduction and drift under the action of the applied electric field. The electrons rush to the positive pole of the power supply, and the holes rush to the negative pole of the power supply, so that the resistance of the photoresistor drops rapidly. <br>The photoresistor is also called a photoconductive detector; it changes the resistor with the influence of incident light. The resistance will decrease when the incident light is strong, and the resistance will increase when the incident light is weak. There is another type of resistance that decreases when the incident light is weak, and increases when the incident light is strong. <br>Photoresistors are generally used for light measurement, light control and photoelectric conversion. Commonly used photoresistors are cadmium sulfide photoresistors, which are made of semiconductor materials. The sensitivity of the photoresistor to light (that is, the spectral characteristics) is very close to the response of the human eye to visible light (0.4~0.76) μm. As long as the human eye can feel the light, it will cause its resistance to change. When designing light control circuits, incandescent bulbs (small bulbs) or natural light are used as the control light source, which greatly simplifies the design. <br>This design uses the change of the photoresistance value and the resistance to divide the voltage, and the voltage value obtained is compared to the LM393. The light limit can be adjusted through the 10k adjustable resistance. Whether the induced light is too weak, send the signal to the single-chip microcomputer for processing.

Photoistors, also known as light catheters, are commonly used in the production of cadmium sulfide, in addition to selenium, aluminum sulfide, lead sulfide and vanadium sulfide and other materials. These making materials have the characteristics of rapidly decreasing resistance under the irradiation of light at a specific wavelength. This is due to the light generated by the carriers are involved in conduction, in the role of the added electric field for drift motion, electrons run to the positive pole of the power supply, holes run to the negative pole of the power supply, so that the resistance of the photoistor rapidly decreased.<br>Photoresistors, also known as photoconductor detectors, change resistors as they are affected by incoming light. The resistance decreases when the incoming light is strong and increases when the incoming light is weak. There is another when the air-in light is weak is that the resistance will decrease, when the incoming light intensity is the resistance will increase.<br>Photoresistors are commonly used for light measurement, light control, and photoelectrelectrtor conversion. A commonly used photoresist cadmium sulfide photoresistor, which is made of semiconductor material. The sensitivity of the photoresistor to light (i.e. spectral characteristics) is very close to the response of the human eye to visible light (0.4 to 0.76) sm, which can cause a change in its resistance as long as the light can be felt by the human eye. When designing optical control circuits, incandescent bulbs (small beads) or natural light are used to control the light source, which greatly simplifies the design.<br>This design uses the change of photosensitivity resistance value and resistance to split the voltage, the resulting voltage value to LM393 for voltage comparison, through 10k adjustable resistance can achieve the adjustment of the light limit. If the sensing light is too weak, the signal is processed by the synth.

Photosensitive resistance, also known as light guide, is commonly used for the production of cadmium sulfide, in addition to selenium, aluminum sulfide, lead sulfide and bismuth sulfide and other materials. These materials have the characteristics of rapidly reducing the resistance value under the light irradiation of a specific wavelength. This is due to the fact that all carriers generated by light participate in conducting electricity and drift under the action of external electric field, electrons rush to the positive pole of the power supply, and the holes rush to the negative pole of the power supply, so that the resistance value of the photosensitive resistor decreases rapidly.<br>Photoresistors, also known as photoconductive detectors, change the resistor with the influence of incident light. When the incident light intensity, the resistance will decrease, when the incident light is weak, the resistance will increase. The other is that when the incident light is weak, the resistance will decrease, and when the incident light intensity is, the resistance will increase.<br>Photoresistors are generally used for light measurement, light control and photoelectric conversion. Common photosensitive resistor cadmium sulfide photosensitive resistor, it is made of semiconductor material. The sensitivity of photoresistor to light (i.e. spectral characteristics) is very close to the response of human eyes to visible light (0.4 ~ 0.76) μ M. as long as the human eye can feel the light, its resistance value will change. When the lamp is used as a light source, the design of the light source is simplified.<br>This design uses the change of photosensitive resistance value and resistance to divide voltage, the voltage value obtained is compared with LM393, and the optical limit value can be adjusted by 10K adjustable resistance. If the induction light is too weak, the signal will be processed by the single chip microcomputer.