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Light Activated "Off" Switch, Or dark activated "On" switch

Discussion in 'LEDs and Optoelectronics' started by mynamehere93, Aug 24, 2011.

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  1. mynamehere93

    mynamehere93

    3
    0
    Aug 15, 2011
    Okay, this seems like a relatively simple task...
    I need to make/get approximately 30 switches that require no power, and connect to ground when there is no light shining on them. Meaning that when there is a light on them, they are not grounded.

    And Also, the light being used is a powerful green laser, so which appropriate components/filters would i need to keeping the switches functional after hours upon hours of constant lasering
     
  2. Externet

    Externet

    759
    165
    Aug 24, 2009
    What is the current these switches will conduct to ground when dark ?

    What is the voltage needed to be as not-ground when the laser hits the target ?

    A solar cell with a green-pass filter lens could be the base of the simple circuit.
     
  3. mynamehere93

    mynamehere93

    3
    0
    Aug 15, 2011
    ill have to test the connections, as i have no idea to the voltage/current needed, but to put it in perspective, its making the connection of an electronic keyboard keypush, so its not going to be super extreme...
     
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