Photo Cell Sensor

Discussion in 'The Projects Forum' started by nubbins, Nov 22, 2013.

  1. nubbins

    Thread Starter New Member

    Nov 22, 2013
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    I have a 12vdc photo cell sensor, when triggered a 3.3v is on the output.

    How can I get a 12vdc out when the sensor is triggered?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,115
    3,040
    You could use an external transistor. What's the voltage at the output when not triggered?

    Also, please provide details of your sensor. It could be an open collector output.
     
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  3. nubbins

    Thread Starter New Member

    Nov 22, 2013
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  4. #12

    Expert

    Nov 30, 2010
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    The instructions say it outputs 3.3 volts.
    This circuit will convert that to "0 volts to 12 volts" with a current capability of 50 milliamps. You can change the resistor values to get different amounts of current. You can add another transistor to get the voltages to be "12 volts to 0 volts".
     
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  5. nubbins

    Thread Starter New Member

    Nov 22, 2013
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    Is this representing the connection to the 2N3904 from the Sensor?
     
  6. #12

    Expert

    Nov 30, 2010
    16,283
    6,795
    What else would it represent? Some other transistor that I imagined connected to a sensor you are not talking about?
     
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