Activate a Photocell

Discussion in 'General Electronics Chat' started by Werewolfzz, Feb 10, 2010.

  1. Werewolfzz

    Thread Starter New Member

    Feb 10, 2010
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    I am a student working on a Science Olympiad project. I am to use a photocell that will provide the power to operate a motor. I am currently using a 3volt dc motor and two C batterries. I have done research and found the use of a relay in conjunction with the photocell may be the way to accomplish the task. Is this correct and if so I could use some help constructing the components.
     
  2. VoodooMojo

    Active Member

    Nov 28, 2009
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  3. Werewolfzz

    Thread Starter New Member

    Feb 10, 2010
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    do you know anyway to do it without a transistor
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
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    With out a transistor, you put the LDR in line with the motor. That will cause the motor to slow down as the light gets dimmer. You may want to add a POT or another resistor to make sure all current is limited.

    You could also put the LDR in line with a relays coil. Not a good idea, but it would work. At dim levels, the relay could chatter. but at full bringht should be fine.
     
  5. NVENTOR

    New Member

    Mar 12, 2010
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