[beagleboard] Re: PWM: only a finite number of pulses? Controlling stepper motor

[karlkarpfen79]

May be you can ask these guys here: http://www.halaser.eu/e1701m.php

They're offering an industrial motor controller based on an BBB and should 
have solved this problem.


Am Samstag, 18. Oktober 2014 03:26:26 UTC+2 schrieb plla...@gmail.com:
>
>
>
> 
>  
>   
> I'm wanting to use the BeagleBone Black to generate a FINITE number of 
> pulses, in order to control a stepper motor. For the controller I have, an 
> A4988, each pulse is one step on the motor. How can I use the PWM on the 
> BBB to send, say, 5 pulses, and no more or less than 5? Or I can use a 
> GPIO. Whichever works. 
>
> I have the Adafruit BBIO library 
> 
>  
> installed. I have thought of doing this in a simple, stupid way - just 
> using python's time.wait() and toggling a GPIO pin, however many times 
> I'd like. But this seems very inaccurate, timing-wise, and moreover 
> inelegant; is there a way to do this better? I'm also investigating events 
> -- i.e., count the numberof pulses that have occured using another GPIO, 
> then stop the PWM when the number of pulses I want has been counted. 
>
>
> Any ideas?
>

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[beagleboard] Re: PWM: only a finite number of pulses? Controlling stepper motor

[fakd23]

You could use the SPI interface 

Am Samstag, 18. Oktober 2014 03:26:26 UTC+2 schrieb plla...@gmail.com:
>
>
>
> 
>  
>   
> I'm wanting to use the BeagleBone Black to generate a FINITE number of 
> pulses, in order to control a stepper motor. For the controller I have, an 
> A4988, each pulse is one step on the motor. How can I use the PWM on the 
> BBB to send, say, 5 pulses, and no more or less than 5? Or I can use a 
> GPIO. Whichever works. 
>
> I have the Adafruit BBIO library 
> 
>  
> installed. I have thought of doing this in a simple, stupid way - just 
> using python's time.wait() and toggling a GPIO pin, however many times 
> I'd like. But this seems very inaccurate, timing-wise, and moreover 
> inelegant; is there a way to do this better? I'm also investigating events 
> -- i.e., count the numberof pulses that have occured using another GPIO, 
> then stop the PWM when the number of pulses I want has been counted. 
>
>
> Any ideas?
>

-- 
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[beagleboard] Re: PWM: only a finite number of pulses? Controlling stepper motor

[cncbasher]

see Linuxcnc.org  and the beaglbone variant Machinekit does exactly that  


On Saturday, 18 October 2014 02:26:26 UTC+1, plla...@gmail.com wrote:
>
>
>
> 
>  
>   
> I'm wanting to use the BeagleBone Black to generate a FINITE number of 
> pulses, in order to control a stepper motor. For the controller I have, an 
> A4988, each pulse is one step on the motor. How can I use the PWM on the 
> BBB to send, say, 5 pulses, and no more or less than 5? Or I can use a 
> GPIO. Whichever works. 
>
> I have the Adafruit BBIO library 
> 
>  
> installed. I have thought of doing this in a simple, stupid way - just 
> using python's time.wait() and toggling a GPIO pin, however many times 
> I'd like. But this seems very inaccurate, timing-wise, and moreover 
> inelegant; is there a way to do this better? I'm also investigating events 
> -- i.e., count the numberof pulses that have occured using another GPIO, 
> then stop the PWM when the number of pulses I want has been counted. 
>
>
> Any ideas?
>

-- 
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Re: [beagleboard] Re: PWM: only a finite number of pulses? Controlling stepper motor

[David Armstrong]

what is the end product you want ? cnc ? 3d printer ?
Linuxcnc does all this and is proven and reliable and works on a beaglebone
black ( machinekit)

i am a moderator for Linuxcnc , and have worked with steppers for a lot of
years , so give me some more information and see how it fits or not to your
project needs it all depends on what else you want the BBB to do , as you
only have limited resources

A4988 is a standard stepper driver and works no differently than any other
,

if Linuxcnc is too much of bruteforce etc , see Derricks video here , it
works very well

http://derekmolloy.ie/beaglebone/driving-stepper-motors-in-embedded-linux-on-the-beaglebone/

Shout if i can be of help

Dave

see
Linuxcnc.org

Machinekit see
http://www.machinekit.io/
google group machinekit






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