urgent need help building circuit

Discussion in 'General Electronics Chat' started by jbbaby, Dec 10, 2005.

  1. jbbaby

    Thread Starter New Member

    Dec 10, 2005
    guys i know very little about electronics.but,
    I have a 6volt toy motor made by solorbots (gm7).
    I need a circuit to drive this motor in forward
    for about 2 seconds,the stop(or turn off)for about
    4seconds,then drive in reverse for about 2 seconds,
    then stop(or turn off)for about 4 seconds.an
    keep repeating cycle.A forward an reversing motion
    with time delays.i will pay for your time an supplies. ASAP CONTACT INFO 504-343-2408 GERALL
    thank you
  2. vineethbs

    Well-Known Member

    Nov 14, 2004
    what kind of motor ??
    i guess it shud be dc but still ....

    guys , what abt using the following ckt ?
    lets say a 3 bit counter
    2 sec clock

    state 000 : switch H bridge transistors ( say fwd , the 2 of them )
    state 001 : stop
    state 010 : stop
    state 011 : switch H bridge transistors ( the other 2 )
    state 100 : stop
    state 101 : stop

    reset counter and do again

    usually arnd here "toy" motors are dc :)
  3. jbbaby

    Thread Starter New Member

    Dec 10, 2005
    I'm sorry yes dc. but i don't understand the electronic terms could you build it
    for me ill pay. or explain it to me.Im a bartender.
  4. vineethbs

    Well-Known Member

    Nov 14, 2004
    oye, i don't work for money, i can get u a ckt diagram once u get me specs like the current rating and all. Its always nice that u do it urselves.

    An explanation follows ...

    U said that the motor was dc, well here is a simple example of how dc motors work, usually small toy motors have permanent magnet stators ( which is the well stationary part of it ) and a coil as the rotor (the part that turns ) . Depending on the direction of current in the coil u can turn the motor one way or the other. U wanted to turn the motor in the forward direction and then in the reverse direction, so u need some kind of a switching mechanism to do that.

    |*********** |
    |*********** |
    / a ******* / b
    |*********** |
    --------( )--------
    | ***********|
    | ***********|
    / b*********/ a

    a set of 2 switches are switched together, to make way for the current
    so both a switches together, cause the thing to move in one direction and both b switches in another direction.

    in ur case, we need to make sure that one set stays on for 2 secs, then both sets turn off , then the next set for 2 secs etc, so this happens in sequence, in fact we can say something like this,
    in the first 2 seconds something happens, next 4 secs something else happens like that so we need to count the time
    some pseudocode

    while true // always happens until u pull the plug :p
    if time = 0 sec do this
    if time = 2 sec do this
    if time = 6 sec do this

    like that

    hmm guess this is a lengthy post
    do one thing tell me if u like the explanation if so i will continue,
    also tell me if u really want to do this urself, or just want a solution.