What is photocell and where it is used?
A device that detects light. Used for photographic light meters, automatic on-at-dusk street lights and other light-sensitive applications, a photocell varies its resistance between its two terminals based on the amount of photons (light) it receives.
How does photocell sensor work?
A photocell or photoresistor is a sensor that changes its resistance when light shines on it. The resistance generated varies depending on the light striking at his surface. A high intensity of light incident on the surface will cause a lower resistance, whereas a lower intensity of light will cause higher resistance.
What is the importance of photocell sensor?
Photocell
and motion sensor are electronic devices used to manage indoor and outdoor
lighting systems. These sensors are used to save energy by turning the
lights on when it gets dark or when motion is detected, and turning them off
when they are no longer needed.
What is the difference between a PIR and a photocell sensor?
This can be
overcome by combining a thermometer to help the PIR sensors alter their
sensitivity depending on the outdoor temperature. Comparatively, photocells
do not detect physical movement but instead respond to changes in light levels.
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