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simple control a dc motor via arduino uno ?

Discussion in 'Sensors and Actuators' started by majico, Aug 4, 2015.

  1. majico

    majico

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    Aug 4, 2015
    hi sirs, this is my first topic in this forums ..
    i want to control a 12v and a 5v dc motor with 2 terminals only .. not steppers .. and i have not a drive motor shield or its IC. i want not to control their speeds but enable and disable them by my arduino and i fear of high current that can reverse on arduino borad even from a simple 1.5 volt motor so i prefers safety first :D ..
    all i have - my arduino uno & these 2 dc motors and 2 tansistors S15D40 & bld135d
    that in my hand at time :) so can i use them instead of mosfet trans. ? and keep the arduino safe .. knowing that
    my pwer source is 12/5 v with 2A
    AND SORRY FOR MY BAD ENGLISH :D
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    majico likes this.
  3. majico

    majico

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    Aug 4, 2015
    thank you very very much sir <3 you really helped me so much .(y)
     
  4. majico

    majico

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    Aug 4, 2015
    but i wonder why this diode must connected parallel not series with the motor or the inductive ?
     

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  5. Minder

    Minder

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    Last edited: Aug 5, 2015
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  6. Alec_t

    Alec_t

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    Jul 7, 2015
    Without that diode the transistor will die.
     
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  7. majico

    majico

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    Aug 4, 2015
    i know bro .. it prevent current to return back ( make the connection reverse baise ) but why it parallel not series
     
  8. majico

    majico

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    Aug 4, 2015
    thank you very much .. that was accurate
     
  9. Alec_t

    Alec_t

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    Jul 7, 2015
    So that the high back-emf voltage is clamped to the supply voltage and to provide a re-circulating current path to enable energy stored in the inductor to be dissipated.
     
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