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Topic: Help communicating DIY Muscle Sensor with Processing Program! [SOLVED] (Read 2652 times) previous topic - next topic


Sep 16, 2013, 08:13 pm Last Edit: Sep 17, 2013, 10:40 am by ioanna_pat Reason: 1

I have built a Muscle Sensor through this Instructable: http://www.instructables.com/id/Muscle-EMG-Sensor-for-a-Microcontroller/

However,I am stuck in the Instructable (step 12) that shows how to Communicate the Arduino with the Computer to analyze the Data from the Sensor (which is this: www.instructables.com/id/USB-Biofeedback-Game-Controller/step12).

I have compiled and Uploaded the Sketch to my Arduino, I have downloaded the latest Processing, and opened the Processing Program with it.

I click on the run button but I get the following output:
Code: [Select]
Listening for transport dt_socket at address: 8819
Stable Library
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
java.lang.RuntimeException: java.lang.ArrayIndexOutOfBoundsException: 1
at processing.core.PApplet.runSketch(PApplet.java:10460)
at processing.core.PApplet.main(PApplet.java:10265)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
at AnalogVisualizationProcessing.<init>(AnalogVisualizationProcessing.java:51)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at processing.core.PApplet.runSketch(PApplet.java:10458)
... 1 more

The code should at first print some variables so, since it doesn't here, it isn't an Error in communication with the Arduino or in the Arduino Program.

I am not familiar with Processing, so If anyone knows how to solve this issue, please post!

If needed, here is the Program Code: (links for the two programs in the Instructable also...)
Code: [Select]
*  By Hannah Perner-Wilson, www.plusea.at
*  Modified 3/30/2012 By Brian E Kaminski, www.AdvancerTechnologies.com
*  Scroll down to set your serial port
*  Scroll down to set your thresholds

import processing.serial.*;

// definition of window size
// you can change the size of the window as you like
// the thresholdGraph will be scaled to fit
// the optimal size for the thresholdGraph is 1000 x 400
int xWidth = 1200;
int yHeight = 750;

// xPos input array, using prefix
int[] xPosArr= {0,0,0,0,0,0};

int[] messageArr= {0,0,0,0,0,0};
// Arrays for threshholding
int[] threshMax= {0,0,0,0,0,0};
int[] threshMin= {0,0,0,0,0,0};
// variables for serial connection. portname and baudrate are user specific
Serial port1;

//Set your serial port here (look at list printed when you run the application once)
String V3 = Serial.list()[1];
String portname1 = V3;
int baudrate = 9600;
int prefix = 10001;
boolean myCatch = false;
String serialIN = "";
String serialINPUT = "";
String buffer = "";
int value = 0;

// ThresholdGraph draws grid and poti states
ThresholdGraph in;

void setup(){
 // set size and framerate
 size(xWidth, yHeight);

 // establish serial port connection      
 port1 = new Serial(this, portname1, baudrate);
 port1.bufferUntil('\n') ;
 println(Serial.list());  // print serial list

 // create DisplayItems object
 in = new ThresholdGraph();
 // using the thresholdGraph you can determine the MIN and MAX values
 // of your sensors. Enter these here. They must lie between 0 and 1000.
   //MIN trashhold
   threshMin[0] = 20;   // one
   threshMin[1] = 20;   // two
   threshMin[2] = 20;   // three
   threshMin[3] = 20;   // four
   threshMin[4] = 20;   // five
   threshMin[5] = 20;   // six
   //MAX trashhold
   threshMax[0] = 600;   // one
   threshMax[1] = 600;   // two
   threshMax[2] = 600;   // three
   threshMax[3] = 600;   // four
   threshMax[4] = 600;   // five
   threshMax[5] = 600;   // six
}//end setup

// draw listens to serial port, draw
void draw(){
 // listen to serial port and trigger serial event  
 while(port1.available() > 0){
       serialIN = port1.readStringUntil('\n');
       if(serialIN != "")
         println("found empty");
 // threshold serial input  

 // draw serial input
}//end draw()

If anybody can help, I would appreciate it!


Code: [Select]
String V3 = Serial.list()[1];
What is this going to do it there is only one item in the list? What is it going to do if the list is empty?

Here's a hint:
java.lang.RuntimeException: java.lang.ArrayIndexOutOfBoundsException: 1
The art of getting good answers lies in asking good questions.


I changed it to
Code: [Select]
String V3 = Serial.list()[0];

Now it works fine! Thank you very much!

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