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@sympatico.ca
<mailto: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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