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@gmail.com | À: "Dan Nigrin" dan@defectiverecords.com | Cc: "PD List" pd-list@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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