Beam bot 9v/Herbie photovore

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Discussion in 'The Projects Forum' started by dinmagic, Apr 12, 2009.

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  1. Apr 12, 2009 #1
    dinmagic

    Thread Starter New Member

    Apr 12, 2009
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    Im am working on my second bot. I think its called a Herbie bot or something like that.Oobviously I'm new to this. I am currently building the circuit on a breadboard. I had tried many attempts to make it work but i had failed miserably.

    Since Im new, how should the motors act? If I cover one of any of the Photodiodes, should one motor stall? If I shine light on one of the photodiodes, should one motor increase speed?

    I followed this diagram, built it exaclty as shown but only one photodiode seems effect the motor. The other on the right side doesn't no matter how much or how little light it gets. I tested it out to see if it was broken but it works perfectly fine.


    Heres the diagram I am following.This photo was shown to me by a friend, it had been previously posted on this site a while ago.

    http://forum.allaboutcircuits.com/attachment.php?attachmentid=6820&d=1233016040
     
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  2. Apr 12, 2009 #2
    bertus

    Administrator

    Apr 5, 2008
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    #2 Reply
  3. Apr 12, 2009 #3
    dinmagic

    Thread Starter New Member

    Apr 12, 2009
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    When I exchange them, one motor still doesn't change.
     
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  4. Apr 12, 2009 #4
    bertus

    Administrator

    Apr 5, 2008
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    Hello,

    You say that the CDS on th right side is not reacting (the one with the potentiometer).
    What is the value of the potentiometer at that side?

    Greetings,
    Bertus
     
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  5. Apr 12, 2009 #5
    dinmagic

    Thread Starter New Member

    Apr 12, 2009
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    Nevermind, I got it to work.
     
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  6. Apr 12, 2009 #6
    bertus

    Administrator

    Apr 5, 2008
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    Hello,

    So what was the solution?

    Bertus
     
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  7. Apr 12, 2009 #7
    SgtWookie

    Expert

    Jul 17, 2007
    22,194
    1,761
    It is a good bet that the pot was set to nearly 0 Ohms.
     
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