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

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@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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