Audio output

ghjgghj1

in Contributed Library Questions • 1 year ago

Hi,

I am making a robot for my school project. (on a very low budget)
I have to control 2 motors (forward and reverse), and a servo.
I am trying to use a laptop to send audio signal with a Xbox 360 controller to the Bluetooth head set. Then read the signal with Arduino to control the motors and servo.

I am working on the Processing/laptop end right now, this is what I got so far:

import processing.opengl.*;

import procontroll.*;

import net.java.games.input.*;

import arb.soundcipher.*;

ControllIO controllIO;

ControllDevice xbox;

ControllSlider leftslider;

ControllSlider rightslider;

ControllSlider trigger;

SoundCipher sc = new SoundCipher(this);

void setup() {

controllIO = ControllIO.getInstance(this);

xbox = controllIO.getDevice("Controller (XBOX360 GAMEPAD)");

leftslider = xbox.getSlider(0);

leftslider.setMultiplier(25);

rightslider = xbox.getSlider(2);

rightslider.setMultiplier(25);

trigger = xbox.getSlider(4);

trigger.setMultiplier(25);

}

void draw () {

sc.playNote(150, 100, .5); //marker

println("150");

delay(100);



float l = leftslider.getValue();

sc.playNote(50 + l, 100, .5);

println(50 + l);

delay(100);



float r = rightslider.getValue();

sc.playNote(50 + r, 100, .5);

println(50 + r);

delay(100);



float t = trigger.getValue();

sc.playNote(50 + t, 100, .5);

println(50 + t);

delay(100);

}

It is working almost perfect. I just need to adjust the delay down a little. This is when the problem comes in. The programs freeze some times for a little. I am thinking it is because of the soundcipher. Is there is easier/more efficient way to generate the sound? And any input on the entire project will be helpful, think it will work?

Thanks

Replies(3)

PhiLho

Re: Audio output

1 year ago

I don't know if that's the reason, but often Java programs have a pause, because the garbage collector wakes up and do lot of work. They aren't much suited for real-time applications... (unless taking some care to avoid this, but it is complex)

Jonny Stu..

Re: Audio output

1 year ago

There are plenty of other audio libraries for Processing - you might try using minim and setting the buffer size to something large (2048 or similar). Unfortunately SoundCipher doesn't appear to offer a way to control the buffer size.

ghjgghj1

Re: Audio output

1 year ago

Thanks a lot, it is works perfectly after using minim, I think.

Now I just need to work on reading the freq on Arduino, any suggestions?

Here is the finial code for the laptop if anyone is interested

import ddf.minim.*;
import ddf.minim.signals.*;
import procontroll.*;
Minim minim;
AudioOutput out;
SquareWave sqa;
ControllIO controllIO;
ControllDevice xbox;
ControllSlider leftslider;
ControllSlider rightslider;
ControllSlider trigger;
void setup()
{
minim = new Minim(this);
out = minim.getLineOut(Minim.MONO, 2048);
sqa = new SquareWave(440, 1, out.sampleRate());
out.addSignal(sqa);
controllIO = ControllIO.getInstance(this);
xbox = controllIO.getDevice("Controller (XBOX360 GAMEPAD)");
leftslider = xbox.getSlider(0);
leftslider.setMultiplier(150);
rightslider = xbox.getSlider(2);
rightslider.setMultiplier(150);
trigger = xbox.getSlider(4);
trigger.setMultiplier(150);
}
void draw()
{
sqa.setFreq(440); //marker
println("440");
delay(50);
float l = leftslider.getValue();
sqa.setFreq(200 + l);
println(200 + l);
delay(50);
float r = rightslider.getValue();
sqa.setFreq(200 + r);
println(200 + r);
delay(50);
float t = trigger.getValue();
sqa.setFreq(200 + t);
println(200 + t);
delay(50);
}
void stop()
{
out.close();
minim.stop();
super.stop();
}

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