[PD] control lot of audios files with arduino + puredata

Hans-Christoph Steiner hans at at.or.at
Fri Jun 3 16:51:32 CEST 2011

I think people have done some shift register+firmata things, but  
nothing got integrated into StandardFirmata/  Here's an example:



On Jun 2, 2011, at 1:02 AM, Martin Peach wrote:

> It's certainly possible to make a Pd patch that controls shift  
> registers through firmata. It's also possible to program the Arduino  
> to do that and send the switch numbers to a Pd patch that has a  
> [comport] in it.
> Martin
> On 2011-06-01 22:33, FernandoG wrote:
>> Thanks for answer
>> Martin: I am researching about shift registers, but if the idea is to
>> use puredata to control audio playbacks, thats means that i need to
>> control shift registers with pd? because the arduino will be flashed
>> with pd firmdata and will be imposible to upload code to control  
>> shift
>> registers, is that posible or i am thinking wrong?
>>  Thanks again
>> Best!
>> 2011/5/30 Martin Peach <martin.peach at sympatico.ca
>> <mailto:martin.peach at sympatico.ca>>
>>    On 2011-05-29 23:20, FernandoG wrote:
>>        Hi
>>        i need to design a sistem to control 40 diferents audio  
>> files and
>>        playback in a stereo sistem. I was thinking to use puredata  
>> and
>>        arduino,
>>        load the 40 audios in a pd patch and use 40 switches and
>>        resistors into
>>        some arduino inputs to trigger and playback any of the 40  
>> audios
>>        in pd.
>>        Every switch will be conected to a diferent resistor to   
>> generate
>>        diferents voltages then arduino inputs can diferenciate witch
>>        audio to
>>        playback. Also i need to power on a led any time a specific  
>> audio is
>>        been playback. The 40 audios will not be playback  
>> simultanusly, but
>>        probably al least 15 or 20 could be.
>>        Anybody knows about a similar proyect? can i use analog  
>> input to
>>        control
>>        various samples or its not good idea? multiplexors? do i  
>> need to
>>        use an
>>        arduino mega or its not necesary?can i power 15-20 led
>>        simultaneously?
>>        the best way to do this system stable for long long time?
>>    The analog input method is similar to the resistor ladder that
>>    analog synthesizer keyboards used. Arduino analog inputs can
>>    differentiate 1024 levels but the values of resistors are usually
>>    5%, but 40 levels should be easy.
>>    The best way to do LEDs is with shift registers. That way you can
>>    use just 3 pins on  the Arduino to control as many LEDs as you  
>> like.
>>    For LEDs use parallel-output shift registers, like the 74HC164.  
>> Also
>>    the input could be done with parallel-load shift registers (for
>>    example the 74HC165), but the resistor method is cheaper.
>>    It should be quite stable over time.
>>    Martin
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