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  • Photo diode?

    jav

    Member

    Updated: Oct 25, 2024
    Views: 914
    What is the minimum intensity of light that a photo diode can detect? and how long can the light be kept for sensing it?
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  • EEnano

    Member • Apr 14, 2011

    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

    Member • Apr 16, 2011

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

    Member • Apr 16, 2011

    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
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  • PraveenKumar Purushothaman

    Member • Apr 16, 2011

    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

    Member • Apr 16, 2011

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