What is LDR
Light dependent resistor is also referred to as photo-resistor, cadmium sulfide (cds) cell, photoconductor or photocell. It is an electronic component whose resistance changes with the light intensity falling on it. It has the ability to detect the presence or absence of light and this detection reflects on its resistance value.This allows them to be used in light sensing circuits. Their ability to produce a very large change in
resistance when light falls on them makes them preferred than photodiodes and phototransistors.
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| LDR |
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| LDR symbol |
Applications of LDR
Light dependent resistor is used in circuits where light detection is required. Such application includes:Light activated control circuits
Burglar alarm circuit
Automatic streetlight circuit
Automatic Emergency light
Alarm clock
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