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OPTOELECTRONICS. Photoresistors up close and personal CdS.

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Presentation on theme: "OPTOELECTRONICS. Photoresistors up close and personal CdS."— Presentation transcript:

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

8 Where you find ‘em

9 Communication Link

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


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