[PD] gpio on the raspberry pi from within pd ?
Thomas H.
thomas at asthrolab.fr
Wed Jul 24 11:50:51 CEST 2013
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
----- Mail original -----
| De: "J Oliver" <jaime.oliver2 at gmail.com>
| À: "Dan Nigrin" <dan at defectiverecords.com>
| Cc: "PD List" <pd-list at iem.at>
| 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
|
| | CycliC, M185 & Klee Sequencers / MC-4 & MC-202 Hack / Audio Plugin
| | Player / General MIDI Player / Major Malfunction
|
| | Jack OS X / http://jackosx.com
|
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