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OptoElectronics

OptoElectronics. Photoresistors up close and personal. CdS. Changing light = changing resistance. 0.2 lux = emergency lighting 300 lux = sunrise 1000 lux = overcast day. ~15000 lux = full daylight. How do they work?. All colors of the rainbow work?.

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OptoElectronics

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  1. OptoElectronics

  2. Photoresistors up close and personal CdS

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

  4. How do they work?

  5. All colors of the rainbow work?

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

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

  8. Where you find ‘em

  9. Communication Link

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

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