1 / 10

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?.

razi
Download Presentation

OptoElectronics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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 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)

More Related