HC-04 Ultrasonic Sensor Distance Measurement Module

This photoresistor sensor is sensitive to ambient light intensity. It is generally used to detect the brightness and light intensity of the surrounding environment. It can sense the light source in a fixed direction. When connected to the controller, it can read the ambient light intensity and can be made into a photoelectric switch. The photoresistor is A resistor made using the photoelectric effect of semiconductors whose resistance value changes with the intensity of incident light; when the incident light is strong, the resistance decreases, and when the incident light is weak, the resistance increases. Photoresistors are generally used for light measurement, light control and photoelectric conversion (converting changes in light into changes in electricity). Commonly used photoresistors are cadmium sulfide photoresistors, which are made of semiconductor materials. The resistance of the photoresistor changes with the intensity of the incident light (visible light). Under dark conditions, its resistance (dark resistance) can reach 1~10M ohms. Under strong light conditions (100LX), its resistance The value (bright resistance) is only a few hundred to thousands of ohms. The sensitivity of the photoresistor to light (ie, 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 light that the human eye can feel will cause its resistance to change.