Motor Forward and Reverse SOLVED

Technical
#1

I have an elevator with a motor and i cant get it to go in reverse the line for the motor control is
m_motor.set(m_driverController.getRawAxis(kMotorPort));

I was also trying to use this

m_motor.(
m_driverController.getTriggerAxis(Hand.kLeft), m_driverController.getTriggerAxis(Hand.kRight));

#2

Are you trying to drive the motor with the triggers on a gamepad? One for forward and one for reverse?

#3

im trying to use the triggers just cause thats what it defaulted to

#4

Triggers are a little bit weird because they’re two halves of a single axis on most gamepads. So where most axes are -1 to +1, the triggers are usually just 0 to +1. You usually have to do some of your own logic to mix the two in a useful way.

I would do it this way:

double leftTrigVal = m_driverController.getRawAxis(/*axis number for left trigger*/); 
double rightTrigVal = m_driverController.getRawAxis(/*axis number for right trigger*/) ;
double motorPwr = (leftTrigVal > 0)? -leftTrigVal : (rightTrigVal > 0)? rightTrigVal : 0;
m_motor.set(motorPwr);

In case you’re not familiar with the syntax, the motorPwr = etc. etc. bit is equivalent to:

if (leftTrigVal > 0)
{
    motorPwr = -leftTrigVal; //negate for down direction
}
else if (rightTrigVal > 0)
{
    motorPwr = rightTrigVal;
}
else
{
    motorPwr = 0;
}
#5

so i used the code but both triggers are up now

#6

PSA: please use code blocks when sharing code. You just have to wrap the code in triple backticks, and you can even specify a language and it’ll lex it for you.

image

console.log('See how much better this is?');
1 Like
#7

Negate either the rightTrigVal or the leftTrigVal to get the down direction you want.

#8

Sorry about that. Need to negate either left or right trigger to have one go down. Fixed in the original post.

#9

Thank you. Corrected in the original post.

1 Like
#10

This topic was automatically closed 365 days after the last reply. New replies are no longer allowed.