How do light sensors work?
A CdS cell is a large area photo resistor, made by depositing doped cadmium sulfide on a ceramic substrate. The CdS cell resistance changes in proportion to the amount of visible light; this allows more or less voltage/current to appear at the input of an electronic switching circuit. They can be uncoated, plastic cased, plastic dipped, or glass-to-metal hermetically sealed. A silicon sensor is a small area silicon junction in a clear epoxy package. Silicon photosensors are available in several forms, including phototransistors, photodiodes and photodarlingtons. When a silicon sensor is exposed to light, particularly red or infrared light, current flows. For both kinds of sensors, DTL’s electronic circuit senses these changes and provides a DC voltage to the coil of a power relay. The relay then switches the lighting load that the photocontrol is operating. What are the performance differences between CdS and Si sensors? 1. Is it dark yet? CdS photocells have excellent correlation with
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- So, LEDs can act as light sensors? That blows my mind.
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- How does ambient light affect the sensors?
- How does ambient light affect the sensors?
