If you’re going down the microcontroller route and h-bridges, this
circuit was my first foray into bi-direction motor control:
http://www.mcmanis.com/chuck/robotics/tutorial/h-bridge/bjt-bridge.html
With 3 control lines (forward, reverse, enable) that you can control in
any of the arrangements without any dangerous conditons and because it’s
completely opto-isolated from the control circuit, so it’s fairly robust.
PatrickOn 19/10/14 10:06, Kevin Conroy wrote:
Hi
I’m currently converting some old toys into rc toys using arduino.
I’m using this ic for direction and speed control.
http://web.ics.purdue.edu/~fwinkler/616/sn754410_Arduino.pdf
http://web.ics.purdue.edu/~fwinkler/616/sn754410_Arduino.pdf
Best regards
Kevin
On 18 Oct 2014 23:47, “Jim MacArthur” <jim@mode7.co.uk mailto:jim@mode7.co.uk> wrote:
Hi Dave, speaking as someone who's built a motor controller and
watched it go up in flames, literally, I'd recommend the first type
(Steve Bolt's design). The design on eleccircuit.com
<http://eleccircuit.com> is perfectly
valid but if you accidentally turn on A and B at the same time it will
short-circuit through the transistors.
Another approach is to use a DPDT relay to reverse direction, as in
http://www.me.umn.edu/courses/me2011/arduino/technotes/dcmotors/bidirectional/bidirMotor.html.
This is also impossible to short circuit (assuming you wire it
correctly!)
Jim
On 18 October 2014 09:01, Dave Potts <dave@goopot.co.uk <mailto:dave@goopot.co.uk>> wrote:
> Super. Thanks Alex. Looking at the circuit on the car I think
they used
> microcontroller style brains to make it work. I think we'll
have a go at a
> H bridge and then maybe plug it into an Arduino later on.
>
> Dave.
>
> On 16 Oct 2014 22:58, "Alexander Lang" <alexanderlang1980@gmail.com <mailto:alexanderlang1980@gmail.com>> wrote:
>>
>> Dave,
>>
>> You need to implement a simple H Bridge or switches in order to
make a DC
>> motor go forwards and backwards. You have to reverse the
connections to the
>> DC motor in order to make it change direction. If you have
access to 4x
>> transistors and a breadboard and some hookup wire you can
implement a simple
>> H bridge...quite involved though. The other option is to
reverse the
>> connections to the motor using an DPDT switch. I'm not sure
where the
>> variable resistor comes in other than to change the speed of
the motor...
>>
>> Here are some google fu results which may be of some help....
>>
>> http://library.solarbotics.net/circuits/driver_4varHbridge.html
>>
>>
>>
http://www.eleccircuit.com/basic-how-to-use-h-bridge-motor-driver-using-bipolar-transistor/
>>
>> If you need more help...let me know
>>
>> Cheers
>>
>> Alex
>>
>> On 16 October 2014 21:57, Dave Potts <dave@goopot.co.uk <mailto:dave@goopot.co.uk>> wrote:
>>>
>>> Hi,
>>>
>>> The kids and I have taken apart a broken toy remote control
and found a
>>> 0-10K ohm variable resistor. The request was for then to
attach it to an
>>> electric motor to make a car go forwards and backwards. We
can make the car
>>> go forwards faster or slower based on the state of the
resistor. The
>>> question is how do we make it reverse the motor based on the
variable
>>> resistor?
>>>
>>> Being a software guy I'm tempted to jump to an
micro-controller solution
>>> that watches the voltage change as that resistor changes and
separately
>>> drives the motor either forwards or backwards. That feels a little
>>> over-kill. Is there a bread-board-circuit type solution for
doing the same?
>>>
>>> My google-foo is letting me down.
>>>
>>> Thanks,
>>>
>>> Dave.
>>>
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