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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