Drive Issue
 

Our motors are backwards and my team does not want to reverse the wiring. How do I reverse the motors with Java?

Re: Drive Issue
 

An easy way to do it is just put in the opposite power level. So if you want 0.5 power put in -0.5 instead.

You make one of the joystick values negative.

For further help we would need your code

Re: Drive Issue
 

*-1

or I think this is still valid from last year?

drive.setInvertedMotor(RobotDrive.kFrontLeft, true);
drive.setInvertedMotor(RobotDrive.kRearLeft, true);

Re: Drive Issue
 

This is it so far.

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2008. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/

package edu.wpi.first.wpilibj.templates;

import edu.wpi.first.wpilibj.Joystick;
import edu.wpi.first.wpilibj.RobotDrive;
import edu.wpi.first.wpilibj.SimpleRobot;
import edu.wpi.first.wpilibj.Timer;

/**
* The VM is configured to automatically run this class, and to call the
* functions corresponding to each mode, as described in the SimpleRobot
* documentation. If you change the name of this class or the package after
* creating this project, you must also update the manifest file in the resource
* directory.
*/
public class TheReaper extends SimpleRobot {
RobotDrive drive = new RobotDrive(1, 2);
Joystick leftStick = new Joystick(1);
Joystick rightStick = new Joystick(2);

/**
* This function is called once each time the robot enters autonomous mode.
*/
public void autonomous() {

}

/**
* This function is called once each time the robot enters operator control.
*/
public void operatorControl() {
while (isOperatorControl() && isEnabled()){

drive.tankDrive(leftStick, rightStick);
Timer.delay(0.01);
}

}

/**
* This function is called once each time the robot enters test mode.
*/
public void test() {

}
}

Re: Drive Issue
 

Change that to:

Now to confirm that I'm understanding, both sets of motors are spinning backwards, so the robot moves backwards. Or one set spins forward and one spins back?

Re: Drive Issue
 

It gives me an error when I try that.
Both are backwards.

Re: Drive Issue
 

Try

Re: Drive Issue
 

Both are working now. Thank you very much!

Re: Drive Issue
 

No problem, just so you have an understand of what you just did. The .getY() method returns the value of the joysticks Y axis(forwards and backwards). The - inverts whatever value that it is attached to.