Hi Jaime,
Saw this post of yours from back in April re: GPIO access from within Pd on the Raspberry Pi:
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
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CycliC, M185 & Klee Sequencers / MC-4 & MC-202 Hack / Audio Plugin Player / General MIDI Player / Major Malfunction