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Published byHope Cain Modified about 1 year ago

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OPTOELECTRONICS

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Photoresistors up close and personal CdS

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Changing light = changing resistance 0.2 lux = emergency lighting 300 lux = sunrise 1000 lux = overcast day. ~15000 lux = full daylight

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How do they work?

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All colors of the rainbow work?

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Introducing the phototransistor Same old resistor, except now photons can drive current in the base

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The specs Peak sensitivity 830 nm Higher intensity drives more current Characteristic curves 19 mA

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Where you find ‘em

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Communication Link

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Citations ladyada.net/learn/sensors/cds.html (graphs of R vs illuminance and spectral response) www.societyofrobots.com/schematics_photoresistor.html (pictures of Cds cells) www.societyofrobots.com/schematics_photoresistor.html Tutorvista.com (atomic energy levels)

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