A proximity sensor is a sensor able to detect the nearness of adjacent particles with no physical contact. A proximity sensor often discharges an electromagnetic field or a light emission radiation (infrared, for example), and searches for changes in the field or return signal. The object being detected is often referred to as the proximity sensor's target. An ambient light sensor is a device that detects the sum of light in the region. An ambient light sensor might be incorporated with a smart phone or tablet to alter the screen brightness in view of the accessible light.
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