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USB LDR Controlled Light

Discussion in 'LEDs and Optoelectronics' started by CoolJRT2009, Apr 8, 2009.

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  1. CoolJRT2009


    Apr 4, 2009
    I am making a USB light.
    I want it to light up whe it is dark and turn off when it is light, just like a street-light.
    I have a light-dependant resistor (LDR) and don't know how to work it.
    I tried putting it in place of the switch but it just stayed off.
    Please someone help me!
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