Controlling process priorities
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
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
bumped to the homepage by Community♦ 2 days ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
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
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
bumped to the homepage by Community♦ 2 days ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
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
add a comment |
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
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
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
raspberry-pi arduino
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
edited Jul 27 '13 at 1:44
jasonwryan
49.3k14134184
49.3k14134184
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
asked Jul 27 '13 at 1:18
Yamaha32088Yamaha32088
1387
1387
bumped to the homepage by Community♦ 2 days ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 2 days ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
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
add a comment |
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
add a comment |
1 Answer
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Try using nice and allocate higher priority to your process.
answered Jul 27 '13 at 7:52
StackedStacked
11114
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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.
answered Jul 27 '13 at 7:52
StackedStacked
11114
add a comment |
Try using nice and allocate higher priority to your process.
answered Jul 27 '13 at 7:52
StackedStacked
11114
add a comment |
Try using nice and allocate higher priority to your process.
answered Jul 27 '13 at 7:52
StackedStacked
11114
Try using nice and allocate higher priority to your process.
answered Jul 27 '13 at 7:52
StackedStacked
11114
answered Jul 27 '13 at 7:52
StackedStacked
11114
answered Jul 27 '13 at 7:52
StackedStacked
11114
answered Jul 27 '13 at 7:52
StackedStacked
11114
11114
add a comment |
add a comment |
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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