Photosensitive Elements by hcj

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									PHOTOSENSITIVE ELEMENTS
Photoresistors up close and personal


                                CdS
Honey, I shrunk the resistor
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?
Where you find ‘em
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)
 Tutorvista.com (atomic energy levels)

								
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