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

[Hans-Christoph Steiner]

You could buy an Arduino Mega, that has at least 40 inputs.  Then you  
don't need a shift register, just the Arduino Mega with Firmata.   
That's a simpler solution, IMHO.

.hc

On Jun 1, 2011, at 10:33 PM, 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>
> 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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