about dc motor???

Discussion in 'General Electronics Chat' started by ahmedahmedahmed, Nov 28, 2007.

  1. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    i have a dc motor
    i need to run it using time.
    i mean run for 1 sec then stop.
    also i need it at two direction

    thanks all
     
  2. Voltboy

    Active Member

    Jan 10, 2007
    197
    0
    Just use a 555 timer.
    Do you plan on changing direction automatically or manually?
    Do you also need to control speed?
     
  3. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    how can i use 555 timer?? i need it circuit.
    is there away to change direction automatically? give me the circuit
    also give me the circuit for control direction manual.
    if i need to control the speed , can i use PWM ?
    reply to me
    thanks for u.
     
  4. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    you havent provided much details,
    for how long do you want the motor to stop?
    or do you want it to turn on for only one second and manually control when to start?
    how and when do u want it to change direction.

    and most importantly try to learn about 555 timer circuits,etc.
     
  5. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    for 3sec and how i can change this i mean if i need to change it from 3sec to 1sec what i must change???
    do you want it to turn on for only one second and manually control when to start? yes
    how and when do u want it to change direction? i will change it direction manual using switch
    reply for me
    thanks
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Learn about the 555 chip here: http://www.uoguelph.ca/~antoon/gadgets/555/555.html

    PWM is a good way to control the speed of a DC motor.

    The voltage and current required by your motor will dictate the switching transistor used. The switching transistor will be controlled by the 555 and the PWM.

    Side note: "replay" means "play again;" "Reply" means "say something in response."
     
  7. Voltboy

    Active Member

    Jan 10, 2007
    197
    0
    So if you want it to turn on for 3 secs after you touch the switch use the monoastable.
    [​IMG]
    And if you want it to turn on for 3 secs, and then turn off for 1 sec..and keep going use the astable mode.
    [​IMG]

    You also could use one of those circuits (depending on how you want it to work) and connect the output somehow to trigger another 555 for the PWM, again use astable mode.
    And for the direction of the motor use an H-Bridge, just look at it in google.
     
  8. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    i know about H-bridge.
    but (and connect the output somehow to trigger another 555 for the PWM)??? what do u mean about this???
    thanks
     
  9. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    ok thanks can u give me circuit for (555 with PWM)???
    thanks again!!!!!!!!
     
  10. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Use the second circuit on this page: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/and.html

    Tie the timer output to A and the PWM output to B. Send the AND gate output to the switching transistor for your motor.

    See also: http://www.cpemma.co.uk/555pwm.html

    The "556" is a single chip with two 555 timers inside.

    Between the three circuits you've been shown in this thread, (the two in this post and the correct one from Yoda's post) you now have 100% of what you need.

    Please be sure and let us know how your project turns out!
     
  11. ahmedahmedahmed

    Thread Starter Member

    Nov 12, 2007
    29
    0
    ok i will
    thanks alot!!!!!!!!!!!!!!1
     
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