Photo diode?

Replies

• 

  EEnano

  depends on the diode. each diodes detects/admits difference range of frequency. that's why u have red, blue, etc... diodes... of course that diodes will be depends on the materials, doping level... etc...
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  Mr.Don

  EEnano is correct but using IR sensor will be good for smaller applications.
• 

  EEnano

  just a little bit more information to add on dileep comment if he don't mind.
  
  if you're wondering why IR sensor is good for smaller applications i think you should look at the light spectrum "https://eosweb.larc.nasa.gov/EDDOCS/images/Erb/wavelength_figure.jpg" because the wavelength is much smaller for IR thus it is better for smaller detection. please correct me if i'm wrong😀 so from this you can choose your diode correctly depending on applications
  
  best wishes
  EEnano
• 

  PraveenKumar Purushothaman

  Even an LDR with an LED makes a good combo... Like having those stuff for the automatic water tap... I used laser for some other project... 😀
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  Mr.Don

  @EEnano Good to have you to contribute more information EEnano. I don't mind if you add further information. Thanks 😀