LDR Photoresistor
Together with the 'Laser module for Arduino', this worked brilliantly in a project with my 9yo, thanks also to the LB Arduino 'Laser tripwire' tutorial. Thanks.
Thomas Green
Little Bird
LDR Photoresistor
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Little Bird Electronics
$1.25
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This Light Dependant Resistor (LDR) can be used to easily measure ambient light with your Arduino or other board with analog input. You will need to set t...
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This Light Dependant Resistor (LDR) can be used to easily measure ambient light with your Arduino or other board with analog input. You will need to set this up as a voltage divider with a resistor of around 10KΩ.
Specification:
Maximum voltage: 150V, DC
Maximum wattage: 90mW
Operating temperature: -30°C ~ 70°C
Spectral peak: 540nm
Bright resistance (10Lux) (KΩ): 5 - 10
Dark resistance: 0.5 MΩ
100λ10: 0.5
Response time: 20ms (Rise), 30ms (Down)
Resistance illumination: 2
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- photocell
- A light-sensitive component whose electrical resistance changes with the amount of light falling on it. It matters when choosing or using light sensors, automatic lights, or brightness-detecting circuits because its response speed, resistance range, and sensitivity affect how reliably it detects light levels.
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