Thanks Thomas – damn, I thought all pins were 5v – I saw that there was a power pin at that level, and assumed the others were too.
So when you say "PWM is easily configured" - do you mean that it is some setting that I adjust on the Pi itself, and then getting a variable voltage is as simple as sending a value between 1 and 1023 from Pd to the Pi? Or do I have to do some programming within Pd to do the actual PWM? If this is the case – that's exactly what I need help with, not sure how to do that. Thanks!! Dan -- Dan Nigrin / Defective Records / http://defectiverecords.com <http://defectiverecords.com/> CycliC, M185 & Klee Sequencers / MC-4 & MC-202 Hack / Audio Plugin Player / General MIDI Player / Major Malfunction Jack OS X / http://jackosx.com <http://jackosx.com/> From: Thomas HOCEDEZ <[email protected]> Date: Wednesday, July 24, 2013 5:34 AM To: J Oliver <[email protected]> Cc: PD List <[email protected]>, Daniel Nigrin <[email protected]> Subject: Re: [PD] gpio on the raspberry pi from within pd ? Hi ! PWM on RPi is easyli configured, with a value from 1 to 1023. Be careful only some GPIO are PWM : https://www.modmypi.com/blog/raspberry-pi-gpio-en-franais The voltage output will be 3V3 @100%, I have to check this, but pretty sure. REgards. ¤º°`¯ ¯`°²º¤æ=¬« Thomas HOCEDEZ »¬=椺²°`¯ ¯`°º www.asthrolab.fr > De: "J Oliver" <[email protected]> > À: "Dan Nigrin" <[email protected]> > Cc: "PD List" <[email protected]> > Envoyé: Mercredi 24 Juillet 2013 11:13:10 > Objet: Re: [PD] gpio on the raspberry pi from within pd ? > > Hi Dan, > > I am Cc'ing the list, which is really your best resource. I haven't output > variable voltages from the pi, but I am sure a lot of people have experience > with this... > > best, > > J > > On Jul 24, 2013, at 4:39 AM, Dan Nigrin wrote: > >> Hi Jaime, >> >> Saw this post of yours from back in April re: GPIO access from within Pd on >> the Raspberry Pi: >> >> http://lists.puredata.info/pipermail/pd-list/2013-04/102172.html >> >> I'm a total Pi newbie – I don't even own one yet. I'm considering a project >> with it though, where I would like to use Pd to generate some audio, and to >> output it to another device (a Mutable Instruments Shruthi synth filter >> board). However, I also need to generate control voltages that need to get >> sent to the filter board, to control its various parameters (e.g. cutoff, >> resonance, etc...). I also need to send +5v and ground to the filter board. >> >> So from your post, it seems quite straightforward to be able to access the >> GPIO pins from within Pd. But I need to be able to create variable voltages >> (between 0 and 5v) on those pins. In the post above, you mentioned that you >> send a float to the gpio object to write a value to the pin - would sending a >> 0.5 for example give me 2.5v on the pin? Or is it only on/off (0 or 5v)? >> If the former, I'm all set! If the latter, I'll need to figure out how to >> simulate a reduced voltage at the pin (likely using PWM or something – but >> I'm not really sure how I would do that…) >> >> Any help greatly appreciated! >> >> Best, >> Dan >> -- >> Dan Nigrin / Defective Records / http://defectiverecords.com >> <http://defectiverecords.com/> >> CycliC, M185 & Klee Sequencers / MC-4 & MC-202 Hack / Audio Plugin Player / >> General MIDI Player / Major Malfunction >> Jack OS X / http://jackosx.com <http://jackosx.com/> >> > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list
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