Controlling servos with arduino problem

Integration and Hardware

Ben Crack..

Controlling servos with arduino problem

in Integration and Hardware • 3 years ago

Hey im using this tutorial http://marco.guardigli.it/2010/01/arduinopc-two-axis-controlled-laser-gun.html

to make a pan/tilt servo thingy, but im running into some problems. I have windows 7 64bit.

Problem:

BLACK WINDOW AT THE BOTTOM:

ArrayIndexOutOfBoundExeption: 3

processing.app.debug.RunnerException: ArrayIndexOutOfBoundsException: 3

at processing.app.Sketch.placeException(Sketch.java:1543)

at processing.app.debug.Runner.findException(Runner.java:582)

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.ArrayIndexOutOfBoundsException: 3

at lasser.setup(lasser.java:73)

at processing.core.PApplet.handleDraw(Unknown Source)

at processing.core.PApplet.run(Unknown Source)

at java.lang.Thread.run(Thread.java:619)

CODE:

// Processing code for interacting with arduino firmata

// to control servos connected to analog 9 and analog 10 pins

// project "lasergun" by Marco Guardigli, mgua@tomware.it

// see

// http://marco.guardigli.it/2010/01/arduinopc-two-axis-controlled-laser-gun.html

// this code is free software, released under the GNU GPL license

// see www.gnu.org for license details

// copyleft Marco Guardigli

// 2010 jan 11: first version

import processing.serial.*;

import cc.arduino.*;

Arduino arduino;

int maxx; // windows sizes

int maxy;

int calibrating = 0; // nonzero during calibration, states are 0,1,2

int calibrateminx=80; // recalibration window

int calibrateminy=80;

int calibratemaxx=100;

int calibratemaxy=100;

int cx1, cy1, cx2, cy2; // screen mousex/y coords of the two calibration points

float dzx, dzy;

int maxservox=170; // maximum servo excursions - to be redefined in recalibration

int minservox=10;

int maxservoy=170;

int minservoy=10;

int initialservox = 90;

int initialservoy = 90;

int servox, servoy; // current servos positions -in servo range-

int laseroff = 0; // laser is controlled (improperly) as a servo

int laseron = 170; // zero is not actually turned off, but is dimmer

PImage room; // room background (photo shot from laser initial position)

void setup() {

println(Arduino.list());

// IMPORTANT! This code will not work if you do not write the correct //***************************************************

// id of the serial interface in the next line (in my case 3)

arduino = new Arduino(this, Arduino.list()[3], 57600); // <<<<<<processing hilights this area

arduino.analogWrite(9,initialservox); // when the problem occours

arduino.analogWrite(10,initialservoy);

arduino.analogWrite(11,laseroff); // laser off//**********************************************************************************

// put in the next line the file name of your ambient picture

// taken placing the camera in the place where the lasergun is

// so to have a correct perspective on the screen

room = loadImage("myplace.jpg"); // put here the picture of your place

maxx = room.width; // I suggest to resize the picture to 800x600

maxy = room.height;

size(maxx,maxy);

background(120);

image(room,0,0); //show background room

}

void draw() {

switch (calibrating) {

case 0: { // no calibration in course: laser follows pointer

servox = int(map(mouseX,0,maxx,minservox,maxservox));

servoy = int(map(mouseY,0,maxy,minservoy,maxservoy));

arduino.analogWrite(9,servox);

arduino.analogWrite(10,servoy);

}

case 1: { // need to read first calibration point

cx1 = mouseX;

cy1 = mouseY;

}

case 2: { // need to read second calibration point

cx2 = mouseX;

cy2 = mouseY;

}

void mousePressed() {

if (mouseButton == LEFT) {

if (calibrating == 0) { // draw shot on screen

arduino.analogWrite(11,laseron); // and intensify laser

stroke(200,200,0);

fill(200,0,0);

ellipse(mouseX,mouseY,5,5);

delay(500);

ellipse(mouseX,mouseY,10,10);

arduino.analogWrite(11,laseroff);

}

void mouseReleased() {

if (mouseButton == RIGHT) {

switch (calibrating) {

case 0: {

calibrating = 1; // stops laser following mouse pointer

arduino.analogWrite(9,calibrateminx);

arduino.analogWrite(10,calibrateminy);

arduino.analogWrite(11,laseron); // and intensify laser

println("cx1/cy1: point mouse to where laser pointer is and RCLICK");

break;

}

case 1: { // arriving here after rclick release in calibration point 1

calibrating = 2;

arduino.analogWrite(9,calibratemaxx);

arduino.analogWrite(10,calibratemaxy);

arduino.analogWrite(11,laseron); // and intensify laser

print(" calibration point1: "); print(cx1); print(" , "); println(cy1);

println("cx2/cy2: point mouse to where laser pointer is and RCLICK");

break;

}

case 2: { // arriving here after rclick release in calibration point 2

print(" calibration point2: "); print(cx2); print(" , "); println(cy2);

// (cx1,cy1) corresponds to (calibrateminx, calibrateminy)

// (cx2,cy2) corresponds to (calibratemaxx, calibratemaxy)

// i will recalculate minservox, minservoy and maxservox, maxservoy

if (((cx2-cx1) != 0) && ((cy2-cy1) != 0)) {

stroke(200);

line (cx1,cy1,cx1,cy2);

line (cx1,cy2,cx2,cy2);

line (cx2,cy2,cx2,cy1);

line (cx2,cy1,cx1,cy1);

dzx = (calibratemaxx - calibrateminx);

// for some reason dzx=(calibratemaxx-calibrateminx)/(cx2-cx1)

// was not calculated well ( !!! )

// so I had to split the calculation int two statements

dzx = dzx / (cx2 - cx1); // dzx is now "how much servo per pixel"

dzy = calibratemaxy - calibrateminy;

dzy = dzy / (cy2 - cy1);

float leftx = calibrateminx - ( dzx * cx1 );

float rightx = calibratemaxx + ( dzx * (maxx-cx2) );

float upy = calibrateminy - ( dzy * cy1 );

float downy = calibratemaxy + ( dzy * (maxy-cy2) );

minservox = int(leftx);

maxservox = int(rightx);

minservoy = int(upy);

maxservoy = int(downy);

} else {

println("Invalid calibration points selected.");

}

calibrating = 0;

arduino.analogWrite(11,laseroff); // and dim laser

break;

} // end case 2

default: {

break;

} // end case default

} // end switch

} // end if mousebutton right

} // end mouseReleased

****************END***************

Also, when I run the code, I hear the computer disconect and connect USB sound a few times, and the arduino TR&TX

lights flash.

thanks

Replies(7)

PhiLho

Re: Controlling servos with arduino problem

3 years ago

It is quite clear (when you have some experience...

)

println(Arduino.list());

// IMPORTANT! This code will not work if you do not write the correct //***************************************************

// id of the serial interface in the next line (in my case 3)

arduino = new Arduino(this, Arduino.list()[3], 57600); // <<<<<<processing hilights this area

Look at the comment: "(in my case 3)". It means that Arduino.list() returns an array of items. The tutorial writer needed, at the time, the third item, thus use Arduino.list()[3]. If you don't have three items, you have the exception you see. Look at the println output and adapt the code to your case.

Ben Crack..

Re: Re: Controlling servos with arduino problem

3 years ago

Well your right, i dont have much experiece, but thats not the problem, my arduino is also COM3

hndrsn6

Re: Controlling servos with arduino problem

3 years ago

For future reference, in the arduino IDE if you check the Tools>>Serial Port drop-down menu you can tell what number port you're using (if I remember correctly).

Ben Crack..

Re: Re: Controlling servos with arduino problem

3 years ago

ya i know

PhiLho

Re: Controlling servos with arduino problem

3 years ago

Note that Java starts counting at 0. So if your list has three items in it and if you want the last one, you must use [2], not [3].

Ben Crack..

Re: Re: Controlling servos with arduino problem

3 years ago

No that didnt help:( but now it says "ArrayIndexOutOfBoundsExeption: 2" instead of three

But if I put a zervo there, I get the error "ErrorInsideSeria.seriallEvent()" and the servos go all random

But the arduinio is definatly COM3

terryking

Re: Controlling servos with arduino problem

3 years ago

You may be confused about the LIST of Com ports.

This code uses an entry in the TABLE of COM ports:
arduino = new Arduino(this, Arduino.list()[3], 57600);

You can put the port in directly as a string, "COM3" like:
arduino = new Arduino(this, "COM3", 57600);

Try that???

Regards, Terry King ..On the Red Sea at KAUST.edu.sa
terry@terryking.us
Newsletter: http://redseanews.info Community Information: http://redseainfo.info

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