Piezo!
I ran totally out of inspiration today, so my work is kind of simple. I use a potentiometer to make a circle on the screen bigger or smaller. Sound is used to give auditory feedback on the size of the circle.
Arduino code:
int potPin = 0;
int speakerPin = 7;
int val = 0;
void setup() {
pinMode(speakerPin, OUTPUT);
Serial.begin(9600);
Serial.println("ready");
}
void loop() {
digitalWrite(speakerPin, LOW);
val = analogRead(potPin);
val = val*2;
for( int i=0; i<500; i++ ) {
Serial.println(val);
digitalWrite(speakerPin, HIGH);
delayMicroseconds(val);
digitalWrite(speakerPin, LOW);
delayMicroseconds(val);
}
}
Processing code:
import processing.serial.*;
String portname = "COM3"; // or "COM5"
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
int waarde;
void setup() {
size(500,500);
background(255);
smooth();
port = new Serial(this, portname, 9600);
}
void draw() {
// Use those variables to draw an ellipse
background(255);
stroke(0);
fill(100,150,200,200); // (Remember, the fourth argument for a color is transparency.
ellipse(250,250,waarde/8,waarde/8);
}
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) {
buf += char(c);
}
if (c == lf) {
waarde = int(buf);
println("val="+waarde);
buf = "";
}
}
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