In message
<c856a2d1-f89c-402c-821b-10d2d6fe26ee@z1g2000yqn.googlegroups.com>,
mansoor.naseer@gmail.com writes
>On Feb 26, 9:36�pm, "Reenamu" <reen...@gmail.com> wrote:
>> hi
>> I want to interface two stepper motors with 8051. Actually i want to make
>> one kit in which 8051 is interfaced with two stepper motors. I want to
>> control rpm, direction of rotation of the motors. Please give me some
>> information about this and if possible schenatic also.
>> Thanks in advance
>
>I would recommend using AVR or PIC variants which have PWM modules
>built in.
Why when the OP asks about 8051 where many of the multi source 600+
variants of 8051 have a wide choice of PWM?
--
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
\/\/\/\/\ Chris Hills Staffs England /\/\/\/\/
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
Reply by Peter Dickerson●February 27, 20092009-02-27
"Tim Wescott" <tim@seemywebsite.com> wrote in message
news:g_udnUsBIPrRFzrUnZ2dnUVZ_hSWnZ2d@web-ster.com...
> On Thu, 26 Feb 2009 21:50:47 -0600, Jack Klein wrote:
>
>> On Thu, 26 Feb 2009 11:01:59 -0800 (PST), mansoor.naseer@gmail.com wrote
>> in comp.arch.embedded:
>>
>>> On Feb 26, 9:36 pm, "Reenamu" <reen...@gmail.com> wrote:
>>> > hi
>>> > I want to interface two stepper motors with 8051. Actually i want to
>>> > make one kit in which 8051 is interfaced with two stepper motors. I
>>> > want to control rpm, direction of rotation of the motors. Please give
>>> > me some information about this and if possible schenatic also. Thanks
>>> > in advance
>>>
>>> I would recommend using AVR or PIC variants which have PWM modules
>>> built in. This is necessary for accurate control of stepper motors.
>>
>> No, it is not necessary. People were controlling stepper motors with
>> 8051 family micros without PWM units long before either PIC or AVR
>> existed. People including me.
>>
>> If you could not do it that way, that is a reflection on your experience
>> and/or ability, not on the 8051.
>
> I think the respondent is alluding to using the PWM generators for
> microstepping for extra precision. Whether the OP needs that or not is a
> question for the OP to answer.
>
> And yes, you can drive a stepper just fine without either microstepping
> or a PWM.
The way I see it PWM can also be used to control power in the motor. To step
fast you need to put a lot of volts across the windings to counter the
induction but when holding still you don't want to fry. Motors for stepping
fast usually have low resistance and low holding voltages while motors for
holding things in place have higher winding resistance and working volts - I
thing here about the difference between 4-wire two phase motors and 6-wire
two-phase motors.
I have done high presision microstepping before but used analog drive
circuitry (~200usteps/step on 200 pole motor). PWM for driving pumps and
rotating carousels.
...but I'm no expert o that sort of thing, just one of those things needed
to get the job done. In fact I'd like some pointers on estimating
performance possible...
Peter
Reply by Tim Wescott●February 27, 20092009-02-27
On Thu, 26 Feb 2009 21:50:47 -0600, Jack Klein wrote:
> On Thu, 26 Feb 2009 11:01:59 -0800 (PST), mansoor.naseer@gmail.com wrote
> in comp.arch.embedded:
>
>> On Feb 26, 9:36 pm, "Reenamu" <reen...@gmail.com> wrote:
>> > hi
>> > I want to interface two stepper motors with 8051. Actually i want to
>> > make one kit in which 8051 is interfaced with two stepper motors. I
>> > want to control rpm, direction of rotation of the motors. Please give
>> > me some information about this and if possible schenatic also. Thanks
>> > in advance
>>
>> I would recommend using AVR or PIC variants which have PWM modules
>> built in. This is necessary for accurate control of stepper motors.
>
> No, it is not necessary. People were controlling stepper motors with
> 8051 family micros without PWM units long before either PIC or AVR
> existed. People including me.
>
> If you could not do it that way, that is a reflection on your experience
> and/or ability, not on the 8051.
I think the respondent is alluding to using the PWM generators for
microstepping for extra precision. Whether the OP needs that or not is a
question for the OP to answer.
And yes, you can drive a stepper just fine without either microstepping
or a PWM.
--
http://www.wescottdesign.com
Reply by Jack Klein●February 26, 20092009-02-26
On Thu, 26 Feb 2009 11:01:59 -0800 (PST), mansoor.naseer@gmail.com
wrote in comp.arch.embedded:
> On Feb 26, 9:36�pm, "Reenamu" <reen...@gmail.com> wrote:
> > hi
> > I want to interface two stepper motors with 8051. Actually i want to make
> > one kit in which 8051 is interfaced with two stepper motors. I want to
> > control rpm, direction of rotation of the motors. Please give me some
> > information about this and if possible schenatic also.
> > Thanks in advance
>
> I would recommend using AVR or PIC variants which have PWM modules
> built in. This is necessary for accurate control of stepper motors.
On Feb 27, 5:36=A0am, "Reenamu" <reen...@gmail.com> wrote:
> hi
> I want to interface two stepper motors with 8051. Actually i want to make
> one kit in which 8051 is interfaced with two stepper motors. I want to
> control rpm, direction of rotation of the motors. Please give me some
> information about this and if possible schenatic also.
> Thanks in advance
You will need power drivers anyway, so smarter is to buy smart
drivers!
Go to http://www.allegromicro.com/en/Products/Categories/ICs/motor.asp
and look for ones that match your Motor specs.
Micro Stepping is good, and Step/Dirn interfaces slash your
engineering time.
Digikey stocks these : something like the A3967 ? - Dual, 8 microstep
SO24, Step/Dirn just $2.75 one off.
simple really....
-jg
Reply by Klaus Rotter●February 26, 20092009-02-26
Reenamu schrieb:
> hi
> I want to interface two stepper motors with 8051. Actually i want to make
> one kit in which 8051 is interfaced with two stepper motors. I want to
> control rpm, direction of rotation of the motors. Please give me some
> information about this and if possible schenatic also.
> Thanks in advance
On Feb 26, 2:01=A0pm, mansoor.nas...@gmail.com wrote:
> I would recommend using AVR or PIC variants which have PWM modules
> built in. This is necessary for accurate control of stepper motors.
Why would you think that?
Robert
Reply by ●February 26, 20092009-02-26
On Feb 26, 9:36=A0pm, "Reenamu" <reen...@gmail.com> wrote:
> hi
> I want to interface two stepper motors with 8051. Actually i want to make
> one kit in which 8051 is interfaced with two stepper motors. I want to
> control rpm, direction of rotation of the motors. Please give me some
> information about this and if possible schenatic also.
> Thanks in advance
I would recommend using AVR or PIC variants which have PWM modules
built in. This is necessary for accurate control of stepper motors.
These channels work independent of the CPU so, with very little effort
good job can be done.
happy hunting
mak
Reply by ●February 26, 20092009-02-26
On Feb 26, 11:36=A0am, "Reenamu" <reen...@gmail.com> wrote:
> I want to interface two stepper motors with 8051. Actually i want to make
1. Determine what kind of stepper motors you have (hint: count the
wires, then Google).
2. Read up on how they work (hint: Google).
3. Design or copy an interface circuit (hint: Google).
4. Develop or adapt the software (hint: Google).
5. Enjoy.
Reply by Reenamu●February 26, 20092009-02-26
hi
I want to interface two stepper motors with 8051. Actually i want to make
one kit in which 8051 is interfaced with two stepper motors. I want to
control rpm, direction of rotation of the motors. Please give me some
information about this and if possible schenatic also.
Thanks in advance