Controlling process priorities

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3















I have recently started trying to control stepper motors with the Raspberry Pi.



I have succeeded in getting motion. The problem I am having though is that it seems the stepper motor is missing steps and operates very rough.



I took my project to a local hacker space here in Chicago "Pumping Station One" to see if the CNC build club could help clue me in on the problem. Their opinion was that certain processes are taking priority and always executing that it may be causing the issue.



I hooked my stepper up to an Arduino Uno and the stepper motor performed wonderfully. There was also mention of the Pi not having a RTC on it and the delay() function I use in my code for the pulse width might be getting out of sync.



Has anyone experienced anything like this before? Is there anything you know of to test these theories? Maybe another explanation?










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  • You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

    – symcbean
    Jan 10 '18 at 13:36















3















I have recently started trying to control stepper motors with the Raspberry Pi.



I have succeeded in getting motion. The problem I am having though is that it seems the stepper motor is missing steps and operates very rough.



I took my project to a local hacker space here in Chicago "Pumping Station One" to see if the CNC build club could help clue me in on the problem. Their opinion was that certain processes are taking priority and always executing that it may be causing the issue.



I hooked my stepper up to an Arduino Uno and the stepper motor performed wonderfully. There was also mention of the Pi not having a RTC on it and the delay() function I use in my code for the pulse width might be getting out of sync.



Has anyone experienced anything like this before? Is there anything you know of to test these theories? Maybe another explanation?










share|improve this question
























  • You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

    – symcbean
    Jan 10 '18 at 13:36













3












3








3








I have recently started trying to control stepper motors with the Raspberry Pi.



I have succeeded in getting motion. The problem I am having though is that it seems the stepper motor is missing steps and operates very rough.



I took my project to a local hacker space here in Chicago "Pumping Station One" to see if the CNC build club could help clue me in on the problem. Their opinion was that certain processes are taking priority and always executing that it may be causing the issue.



I hooked my stepper up to an Arduino Uno and the stepper motor performed wonderfully. There was also mention of the Pi not having a RTC on it and the delay() function I use in my code for the pulse width might be getting out of sync.



Has anyone experienced anything like this before? Is there anything you know of to test these theories? Maybe another explanation?










share|improve this question
















I have recently started trying to control stepper motors with the Raspberry Pi.



I have succeeded in getting motion. The problem I am having though is that it seems the stepper motor is missing steps and operates very rough.



I took my project to a local hacker space here in Chicago "Pumping Station One" to see if the CNC build club could help clue me in on the problem. Their opinion was that certain processes are taking priority and always executing that it may be causing the issue.



I hooked my stepper up to an Arduino Uno and the stepper motor performed wonderfully. There was also mention of the Pi not having a RTC on it and the delay() function I use in my code for the pulse width might be getting out of sync.



Has anyone experienced anything like this before? Is there anything you know of to test these theories? Maybe another explanation?







raspberry-pi arduino






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edited Jul 27 '13 at 1:44









jasonwryan

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49.6k14134185










asked Jul 27 '13 at 1:18









Yamaha32088Yamaha32088

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  • You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

    – symcbean
    Jan 10 '18 at 13:36

















  • You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

    – symcbean
    Jan 10 '18 at 13:36
















You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

– symcbean
Jan 10 '18 at 13:36





You've not told us what programming language you are using / I am not familiar with "delay()" (but googling for the man page brought up some interesting results)

– symcbean
Jan 10 '18 at 13:36










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Try using nice and allocate higher priority to your process.






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    1 Answer
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    1 Answer
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    Try using nice and allocate higher priority to your process.






    share|improve this answer



























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      Try using nice and allocate higher priority to your process.






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        0







        Try using nice and allocate higher priority to your process.






        share|improve this answer













        Try using nice and allocate higher priority to your process.







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        share|improve this answer










        answered Jul 27 '13 at 7:52









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