Andy you need a bridge circuit or a relay to reverse the current through
the motor, you will find lots of circuits on the net if you do a search.
Try looking at some robot web sites, you will find more motor circuits
than you can shake a stick at!.

---John

On Tue, 7 Nov 2000, Andy Kelley N1YEW wrote:

> Hello,
>
> I have an RC car that does not have a radio and i would like to make it into a roving robot like thing.
>
> I am stuck with this:
> how do I control a motor from a PIC using one side of the motor tied to 1/2 rail(2.5v) and either grounding or connecting Vcc to the motor.  Now is the problem:
>
> I dont know how do this and I have already destroyed a few 2n222's
>
> the motor draws 6/10 of an amp.
>
> @ 2.5 volts that is 1.5 W.
>
> I tried a fet like this
>
>  -/\/\/\/\- Gate
>
>
> Source
> __|_
> /  /  /
>
> Drain - motor - 2.5v
>
> and all it did was make the motor spin in one direction.
>
> Also i have another motor i need to drive at full 5v so i need to reverse both wires on the motor if i want to go in reverse
>
> How can i do this???
>
> Thanks
> Andy N1YEW
>
> --
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>
>
>
>


          -----  John P. Brown      J.P.Brown@bradford.ac.uk ----
           \            --- Witty remark goes here ---         /
            --------------------------------------------------

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