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Outdoor lighting controller including wiper element for light sensor

  • US 4,833,368 A
  • Filed: 01/19/1988
  • Issued: 05/23/1989
  • Est. Priority Date: 01/19/1988
  • Status: Expired due to Fees
First Claim
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1. A controller for an outdoor light source comprising:

  • a voltage source;

    a first Schmitt trigger connected to said voltage source and provided with a light sensing element for sensing the variation in ambient light, said first Schmitt trigger enabled when the level of ambient light falls below a predetermined value;

    a charging-discharging circuit functioning as a time delay circuit connected to the output of said first Schmitt trigger, said charging-discharging circuit provided with an energy storage device for accumulating energy when said first Schmitt trigger is enabled;

    a second Schmitt trigger circuit connected to the output of said charging-discharging circuit for activating the outdoor light source utilizing the energy accumulated in said charging-discharging circuit; and

    a wiping device for removing accumulated dust from said light sensing element, said wiping device includinga motor;

    means for energizing said motor when said first and second Schmitt triggers are enabled; and

    a cap member connected to said motor for rotation across said light sensing element.

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