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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


    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


    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


    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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