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Parallax nullpointerexception error
[3 Replies]
22-Feb-2011 08:41 PM
Forum:
Core Library Questions
I'm trying to do the Theremin project and i have the the arduino connected to the parrallax just fine but when I run the processing program it comes up with this error:
processing.app.debug.RunnerException: NullPointerException
at processing.app.Sketch.placeException(Sketch.java:1543)
at processing.app.debug.Runner.findException(Runner.java:583)
at processing.app.debug.Runner.reportException(Runner.java:558)
at processing.app.debug.Runner.exception(Runner.java:498)
at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)
at processing.app.debug.EventThread.handleEvent(EventThread.java:255)
at processing.app.debug.EventThread.run(EventThread.java:89)
Exception in thread "Animation Thread" java.lang.NullPointerException
at ddf.minim.javasound.JSMinim.getAudioInputStream(JSMinim.java:604)
at ddf.minim.javasound.JSMinim.getAudioSample(JSMinim.java:309)
at ddf.minim.Minim.loadSample(Minim.java:305)
at sketch_feb22c.setup(sketch_feb22c.java:54)
at processing.core.PApplet.handleDraw(PApplet.java:1583)
at processing.core.PApplet.run(PApplet.java:1503)
at java.lang.Thread.run(Thread.java:680)
Heres the code i have in
// written at: luckylarry.co.uk
// very easy Theremin combined with processing
// sketch prints out distance to the serial port
// processing picks up value and plays notes accordingly
// no annoying speaker drone! replace the sounds and delays with
// your own...
import processing.serial.*; // import serial library so we can read the serial port
import ddf.minim.*; // import minim library
// define the serial port
Serial myPort;
// define minim variables:
// here we say that variable A is an audiosample etc...
Minim minim;
AudioSample GSharp;
AudioSample A;
AudioSample Bb;
AudioSample B;
AudioSample C;
AudioSample CSharp;
AudioSample D;
AudioSample Eb;
AudioSample E;
AudioSample F;
AudioSample FSharp;
AudioSample G;
// setup
void setup () {
// set up the variables, loading in the sound files from your project folder
// which should be the same place as where you save this sketch
// details on using minim and audioSample are here:
http://code.compartmental.net/tools/minim/manual-audiosample/
minim = new Minim(this);
GSharp = minim.loadSample("GSharp.wav", 2048);
A = minim.loadSample("A.wav", 2048);
Bb = minim.loadSample("Bb.wav", 2048);
B = minim.loadSample("B.wav", 2048);
C = minim.loadSample("C.wav", 2048);
CSharp = minim.loadSample("CSharp.wav", 2048);
D = minim.loadSample("D.wav", 2048);
Eb = minim.loadSample("Eb.wav", 2048);
E = minim.loadSample("E.wav", 2048);
F = minim.loadSample("F.wav", 2048);
FSharp = minim.loadSample("FSharp.wav", 2048);
G = minim.loadSample("G.wav", 2048);
// List serial ports, saves us trying to figure out which COM we're using.
println(Serial.list());
// Open the active port - providing you've only got one sending serial data (which you should)
myPort = new Serial(this, Serial.list()[1], 9600);
// don’t read the serial buffer until we see a new line - this is genius and simple compared with my last efforts
myPort.bufferUntil('n');
}
void draw() {
// we need to declare the draw function even though we're not using it!!
}
void serialEvent (Serial myPort) {
// get the string from the serial buffer - gets all chars until the next line break...
String bufferString = myPort.readStringUntil('n');
if (bufferString != null) {
// get rid of any whitespace - sometimes the serial buffer can have blanks etc.. in the string
bufferString = trim(bufferString);
// convert the value to an int - we're only sending numbers over the serial port so parsing it to an int shouldn't ever be an issue.
float inByte = float(bufferString);
int pulse = int(bufferString); // declare a variable to hold our value.
println(pulse); // for debug print the value so we can check it.
// remember that our pulse is in CM so if its less than 5cm then do this etc... else do this... else do this.. for as many sound samples
if ( pulse < 5 ) {
GSharp.trigger();
delay(25);
}
else if ( pulse < 8 ) {
A.trigger();
delay(25);
}
else if ( pulse < 11 ) {
Bb.trigger();
delay(25);
}
else if ( pulse < 14 ) {
B.trigger();
delay(25);
}
else if ( pulse < 17 ) {
C.trigger();
delay(25);
}
else if ( pulse < 20 ) {
CSharp.trigger();
delay(25);
}
else if ( pulse < 23 ) {
D.trigger();
delay(25);
}
else if ( pulse < 26 ) {
Eb.trigger();
delay(25);
}
else if ( pulse < 29 ) {
E.trigger();
delay(25);
}
else if ( pulse < 32 ) {
F.trigger();
delay(25);
}
else if ( pulse < 35 ) {
FSharp.trigger();
delay(25);
}
else if ( pulse < 38 ) {
G.trigger();
delay(25);
}
else if ( pulse > 50 ) {
// if the distance is greater than 50cm then play nothing
}
} // end if there's a value in the serial bufferstring
} // end void serialevent()
I'm really new to all of this. Any help would be greatly appreciated.
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