Copyright 2015ST. PETER’S COLLAGE
ILIGAN CITY
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Light Sensor
What is light sensor?
• A light sensor is an electronic apparatus that is used to detect the presence of light in an area. It provides information to the user about shape, speed, distance and dimensions.
Light sensor can measure two kinds of light.
Light sensor does not detect colors, only brightness, also called intensity.
Light sensor sees shades of black and white; it cannot distinguish colors.
Types of Light sensor
• Phototransistors• Photodiodes• Photoresistors or Light-dependent resistor
(LDR)
What is Phototransistor?
• A phototransistor is a device that converts light energy into electric energy.
• Phototransistors produce both current and voltage.
• It was invented by Dr. John N. Shive at Bell lab 1948, but it wasn’t announced until 1950.
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
Phototransistor
What is Photodiode?
• A photodiode is a semiconductor device that convert light into current. The current is generated when photons are absorbed in the photodiode.
• Invented by Jun-ichi Nishizawa and his colleagues in 1950.
Photodiode
Photodiode
Photodiode
Photodiode
Photodiode
Photodiode
Other types of Phototransistor and Photodiode
