Scaling speed with joystick

Programming Support
,
1

I’m trying to scale the speed of my motors using the joysticks. I’ve seen other post about this but when I try implementing it in to my code errors keep showing up. Any ideas or thoughts are welcome. I’m using C++ and Vex code.

2

Welcome to the forum. For coding issues it is useful to post the code that is not working so we can better see problems.

When you post code, use three ` before and after to have it

if(`3==true){ formatted as code }

1 Like
3

from what iv’e seen, and used the forum in the past, no matter what your doing, send pictures and/or videos.

4

Here’s the code I was using.

JoystickValue = vexRT ;
JoystickValue = vexRT ;

// Use 70% of joystick value as the motor drive value
DT.Value = JoystickValue * 7 / 10;

// Limit to half speed (fwd or rev)
 if ( MotorValue) {64}
  ( MotorValue > 64 )
    MotorValue = 64;
if( MotorValue < -64 )
    MotorValue = -64;

// Set the motor output
motor DT = MotorValue;```

Sorry, I've haven't been able to get to the laptop with the code on it.
5

One way is to introduce a variable to set the max speed percentage maxRatio and multiply that by your controller position.

double maxSpeed = .64;
int leftSpeed = 0;
int rightSpeed = 0;

while (true) {
	  leftSpeed =  ( Controller1.Axis2.position() + Controller1.Axis1.position()) * maxSpeed;
      rightSpeed = ( Controller1.Axis2.position() - Controller1.Axis1.position()) * maxSpeed;

      LeftMotors.setVelocity(leftSpeed, percent);
      RightMotors.setVelocity(rightSpeed, percent);
}