January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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Photoelectric sensors
The detection of light and light intensity is used in many IoT sensor devices, such as security systems, smart switches, and smart street lighting. As the name implies, a photoresistor varies in resistance depending on light intensity, while photodiodes convert light into an electrical current.
Photoresistors are manufactured using a high-resistance semiconductor. The resistance decreases as more light is absorbed. In the dark, a photoresistor can have quite a high resistance (in the megaohm range). Photons absorbed by the semiconductor allow electrons to jump to the conduction band and conduct electricity. Photoresistors are wavelength sensitive, depending on their type and manufacturer; however, photodiodes are true ...
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