Theremin analog

atollax

in Integration and Hardware • 1 years ago

Hello, I am new here. So I am working with my project and I need advice.

I want to make theremin music device useing 2 x HC-SR04 ultrasonic range finders, Arduino and Processing,

With one URF I will change sound frequince, with other volume.

At this stage of project I successfully getting data from arduino to processing and I am generating sound, but I am not able to put data from serial port to to line where sound is generating, what I need to do ?

Simply I don't know how to send data from one class to onother, maybe someone can give me a link to good tutorial about this.

Thanks for help

import processing.serial.*;
import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.effects.*;
Serial myPort;
Minim minim;
SineWave sound;
AudioOutput out;
Theremin buzz;
int data = 0;
void serialEvent (Serial myPort) {
String bufferString = myPort.readStringUntil('\n');
if (bufferString != null) {
bufferString = trim(bufferString);
data = int(bufferString);
println(data);
}
}
void setup()
{
size(200, 200);
myPort = new Serial(this, Serial.list()[1], 9600);
myPort.bufferUntil('\n'); // change
minim = new Minim(this);
out = minim.getLineOut(Minim.STEREO, 512);
buzz = new Theremin(200, 0.5); // how to put variable data from serial port instead 200 ?
buzz.play();
}
void draw() {
background(0, 0, 0);
}
void stop()
{
out.close();
minim.stop();
super.stop();
}
class Theremin {
//global variable
int freq = 0;
float volume = 0;
//constructor
Theremin(int _freq, float _volume) {
freq = _freq;
volume = _volume;
}
//function
void play() {
sound = new SineWave (freq, volume, 44100);
out.addSignal(sound);
}
}

Replies(1)

PhiLho

Re: Theremin analog

1 years ago

Moved to Integration & Hardware since most of us cannot test this, unless having the appropriate hardware.
" I don't know how to send data from one class to onother"
I see only one class... Unless you refer to Minim's classes.

That's a common stumbling block, people seeing classes as islands needing to "send" the data one to the other. While it is a common view in some languages / frameworks / view of OOP, in Java it is much simpler: you have an instance of one class, with visible fields and/or functions to get access to these values (accessors, ie. getters and setters, depending if they deliver data or store it).
Just use these to get the data you need.
For example, if one class need to access the volume of Theremin, you can do it like:
out.vol = buzz.volume;
or:
out.setVolume(buzz.getVolume());
or similar (I don't know well the Minim classes, so my example is fictive).

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Theremin analog

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