Post date: Jul 15, 2010 5:13:54 PM
I built a completely new circuit for this one. I got rid of the push buttons and added two potentiometers attached to analog pins 0 and 4 so that I could get two analog values to control the frequency(pitch) and amplitude(volume).
Arduino:
int potPin1 = 0; // set up variables
int potPin2 = 4;
int val1 = 0;
int val2 = 0;
void setup() {
Serial.begin(9600); // begin serial communication at 9600 bps
}
void loop() {
val1 = analogRead(potPin1); // read potPin value and store in val1
val1 = map(val1, 0, 1023, 0, 4978); // adjust values
val2 = analogRead(potPin2);
val2 = map(val2, 0, 1023, 0, 4978);
Serial.print(val1, DEC); // print values and separate with a comma
Serial.print(',');
Serial.println(val2, DEC);
}
Processing:
import processing.serial.*; // import libraries
import ddf.minim.*;
import ddf.minim.signals.*;
Minim minim; // set up variables
AudioOutput out;
SineWave sine;
Serial myPort;
float freq;
float amp;
void setup() {
size(400, 220, P2D); // sets window size
minim = new Minim(this);
// get a line out from Minim with default bufferSize, sample rate, and bit depth
out = minim.getLineOut(Minim.STEREO);
// create a sine wave oscillator, set to value of freq, value of amp, sample rate from line out
sine = new SineWave(freq, amp, out.sampleRate());
// set the portamento speed on the oscillator to 200 milliseconds
sine.portamento(200);
// add the oscillator to the line out
out.addSignal(sine);
// declares myPort and begins serial communication at 9600 bps
myPort = new Serial(this, Serial.list()[0], 9600);
// store values from myPort in a buffer until value is reached
myPort.bufferUntil('\n');
}
void draw() {
background(0); // sets background color
stroke(255); // sets stroke color
// draw the waveforms
for(int i = 0; i < out.bufferSize() - 1; i++)
{
float x1 = map(i, 0, out.bufferSize(), 0, width);
float x2 = map(i+1, 0, out.bufferSize(), 0, width);
line(x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
line(x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
}
}
void serialEvent (Serial myPort) {
// read string and store it in a buffer until value is reached
String myString = myPort.readStringUntil('\n');
// if there is something in myString
if(myString != null) {
// split it at the comma
myString = trim(myString);
int sensors[] = int(split(myString, ','));
for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
// print the sensor values
print("Sensor " + sensorNum + ": " + sensors[sensorNum] + "\t");
}
println();
if(sensors.length > 1) {
// adjust the value of sensors[0] and set as freq
float freq = map(sensors[0], 0, 4978, 1500, 60);
// set the frequency to the new values
sine.setFreq(freq);
// adjust the value of sensors[1] and set as amp
float amp = map(sensors[1], 0, 4978, -1, 1);
// set the amplitude to the new values
sine.setAmp(amp);
}
}
sine.setPan(0); // set speaker balance to even
}
void stop() {
out.close();
minim.stop();
super.stop();
}
A Fritzing picture of the circuit is attached.