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  1. #1
    Junior Member User
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    Jun 2005
    Location
    Belgrade, Serbia
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    Default 2 questions

    hi guys,
    i have two newbie questions:
    1. i have some motor salvaged from old walkman, it works on 3.4V, having it secured with diodes, connect it directly to a microcontroller since it's operating voltage is less than digital logic voltage???
    2. i also salvaged a motor from a CD-ROM (not a stepper, but a small DC motor) how can i see what it's working voltage is if nothing is labeled on it? it is rather small, so i guess it works on less voltage than above mentioned one.

    thanx!

  2. #2
    Member User
    Join Date
    Feb 2005
    Location
    New Delhi
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    36

    Default

    well don't connect motor directly to uC...

    uC can't source/sink currents more than a few millamps (10-20) and thats insufficient to run the motor...secondly if the motor forces the uC to source more current due to its low impedance...the uC port may get damaged...

  3. #3
    Junior Member User
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    Jun 2005
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    Belgrade, Serbia
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    Default

    oh, i see
    thanx!

  4. #4
    Senior Member Cyborg
    Join Date
    Jun 2005
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    India
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    Default

    motor from a CD-ROM -5v and i agree with maxasimo
    use l293D for interfacing
    http://www.onlinetps.com/
    Online Component Shoppe
    Microcontrollers and Solar Robotics Stuffs at cheap rates

  5. #5
    Banned Newbie
    Join Date
    Apr 2016
    Location
    India
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    11

    Default

    Maxasimo is right!! Donot connect the motor directly to the UC.

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