raspberry-gpio-python / Tickets / #4 PWM support

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Anonymous - 2013-03-15

Originally posted by: btcros...@googlemail.com

Software PWM will be available in 0.5.2a

Status: Started

*Originally posted by:* [btcros...@googlemail.com](http://code.google.com/u/111537921664909762562/) Software PWM will be available in 0.5.2a **Status:** Started

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Anonymous - 2013-03-25

Originally posted by: btcros...@googlemail.com

Experimental software PWM now released in 0.5.2a
For documentation, see http://code.google.com/p/raspberry-gpio-python/wiki/PWM

*Originally posted by:* [btcros...@googlemail.com](http://code.google.com/u/111537921664909762562/) Experimental software PWM now released in 0.5.2a For documentation, see [http://code.google.com/p/raspberry-gpio-python/wiki/PWM](http://code.google.com/p/raspberry-gpio-python/wiki/PWM)

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Anonymous - 2013-03-31

Originally posted by: eric.p...@gmail.com

few suggestions :
- make frequency default to 50Hz (usual PWM frequency)
- give ability to set pulse up duration in µs
- give servo angle setter function : pulse in µs = 1520 + angle*400/45
this is the futaba and most used standard : 1520µs neutral, 400µs/45° travel
there is also 1500 + angle*500/45 but it's not correct for most servos.

you should also take a look on RPIO.PWM (http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=36670)
it uses DMA instead of thread, for a really better result, avoid flickering or need to increase thread priority.

*Originally posted by:* [eric.p...@gmail.com](http://code.google.com/u/113315015546737800627/) few suggestions : \- make frequency default to 50Hz \(usual PWM frequency\) \- give ability to set pulse up duration in µs \- give servo angle setter function : pulse in µs = 1520 + angle\*400/45    this is the futaba and most used standard : 1520µs neutral, 400µs/45° travel    there is also 1500 + angle\*500/45 but it's not correct for most servos. you should also take a look on RPIO.PWM \([http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=36670](http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=36670)\) it uses DMA instead of thread, for a really better result, avoid flickering or need to increase thread priority.

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Anonymous - 2013-04-22

Originally posted by: bruce...@gmail.com

Aptitude says I have the latest version of RPi.GPIO v.0.5.2.a-1 installed, but I get an error trying to use GPIO.PWM() or GPIO.cleanup(). I tried to print GPIO.VERSION but got the same not present error. It is like none of those functions/methods are there. Any help to know what to try next?

*Originally posted by:* [bruce...@gmail.com](http://code.google.com/u/101217604804034115222/) Aptitude says I have the latest version of RPi.GPIO v.0.5.2.a-1 installed, but I get an error trying to use GPIO.PWM\(\) or GPIO.cleanup\(\). I tried to print GPIO.VERSION but got the same not present error. It is like none of those functions/methods are there. Any help to know what to try next?

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Anonymous - 2013-04-23

Originally posted by: bruce...@gmail.com

I learned my own answer - but I'll post here what helped in case it can help someone else.
Even tho Aptitude said I had the latest version of python-rpi.gpio, when I ran:
[pip freeze] it showed me the version was only 0.3 something.
so then I was able to run the following to upgrade to the latest:
[sudo pip install RPi.GPIO --upgrade]
now the newer functions work! :-) Thanks for your work on this module!

Last edit: Anonymous 2016-12-20

*Originally posted by:* [bruce...@gmail.com](http://code.google.com/u/101217604804034115222/) I learned my own answer - but I'll post here what helped in case it can help someone else. Even tho Aptitude said I had the latest version of python-rpi.gpio, when I ran: \[pip freeze\] it showed me the version was only 0.3 something. so then I was able to run the following to upgrade to the latest: \[sudo pip install RPi.GPIO --upgrade\] now the newer functions work\! :-\) Thanks for your work on this module\!

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Andrew Scheller - 2016-05-13

Should this ticket have been closed by now? ;-)
https://sourceforge.net/p/raspberry-gpio-python/wiki/PWM/

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PWM support

A Python module to control the GPIO on a Raspberry Pi

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#4 PWM support

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