Ambient Light Sensors
Ambient light sensors are typically used to mimic the response of the human eye in some regard, or at least be applied to an electronic component that directly relates to the human experience under ambient lighting conditions. They are commonly used to adjust display brightness of a certain device based on the brightness of the outside environment. For instance, a digital clock may be brighter during the day than at night so as to not overwhelm with the light intensity and two different times. Another can be a display monitor such as a computer screen or television. Apart from other photovoltaic sensors, they do not have an infrared or another light transmission element that is used to enhance elements outside the sensing device. They rely strictly on the light provided by the environment in which they reside, as do eye under the same conditions.
Within the light sensor, there is a sensing element that is sensitive to light in some manner. Usually, it is a type of diode or photoresistor which has a response to the light input that can be measured and transmitted effectively. This response is most commonly a voltage change across the discrete element that a controller can detect. Read more Read less