Light sensor
A smart phone usually has an automatic brightness adjustment function. After the function is enabled, your mobile phone screen brightness can be automatically adjusted in accordance with the ambient light intensity. In a sunny outdoor environment, the screen brightness automatically increases and becomes larger automatically. In a dark night, the screen brightness automatically decreases to reduce the stimulation of light on the eyes and save more. A light sensor is used to automatically adjust the screen brightness of a cell phone to perceive the intensity of ambient light.
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