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SENSORS / LIGHT/COLOR/PHOTO / PHOTO TRANSISTOR LIGHT SENSOR
DESCRIPTION
This Photo Transistor Light Sensor is a simple sensor that detects ambient light. It's kind of the
opposite of an LED - when light hits the little chip inside, it induces current to flow from the long
pin to the short pin. This sensor has a built-in optical filter (probably IR filter) so it'll do a fair job
of simulating light levels as the human eye does. Basically, connect the pin connected to the
'thicker' part of the sensor to 3-15VDC or so, and the thinner-part pin through a ~1K-10K series
resistor to ground. When its dark, there's almost no current flowing through the sensor or
resistor and the analog voltage is near ground. When there's light near the sensor, the current
through the resistor will increase, raising the voltage. You can adjust the series resistor to get
the voltage range you need, and measure the analog voltage with a microcontroller. If you're
not getting any readings, try flipping the sensor around.
These are, essentially, replacements for CdS photocells, but are RoHS compliant.
New Products 2/3/2016
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Photo Transistor Light
Sensor
PRODUCT ID: 2831
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DESCRIPTION
TECHNICAL DETAILS
TECHNICAL DETAILS
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Datasheet
Sensor Dimensions: 5mm x 5.3mm / 0.20" x 0.21"
Weight:
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Optical Sensor with 470 and
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Adafruit APDS9960
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(PN2907) - 10 pack
Bipolar Transistor Kit - 5 x
PN2222 NPN and 5 x
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