Run Command Once When Trigger is Pressed

[inkspell4]

How do i make it so that a command runs once when the trigger is pressed?

[Ether]

Originally Posted by inkspell4

How do i make it so that a command runs once when the trigger is pressed?

Set a boolean TRUE on rising edge of trigger, and

Run the command when the boolean is TRUE and set the boolean OFF after running.

[Arhowk]

yourTrigger.whileActive(yourCommand);

[krieck]

Try:

Joystick stick = new Joystick(1);
JoystickButton trigger = new JoystickButton(stick, 1);
trigger.whenPressed(new MyCommand));

[inkspell4]

Originally Posted by Ether

Set a boolean TRUE on rising edge of trigger, and

Run the command when the boolean is TRUE and set the boolean OFF after running.

Could you give me an example of how to do this

[RufflesRidge]

Originally Posted by inkspell4

Could you give me an example of how to do this

If you're using the Command Based templates I second what Kriek is suggesting.

Ether's suggestion is the generic description of exactly what Kriek
suggestion does for you.

[BradAMiller]

Here is an example of running commands whenever a joystick button is pressed. You can also associate commands with buttons from the Cypress module or any arbitrary polled trigger (see Trigger class).

http://Wpilib.screenstepslive.com/s/3120/m/7952/l/97457

Besides using whenPressed() you can also call whenReleased() to get a command to run when the button is released or whileHeld() to get a command to repeatedly run while the button is pressed.

Brad

[inkspell4]

Originally Posted by RufflesRidge

If you're using the Command Based templates I second what Kriek is suggesting.

Ether's suggestion is the generic description of exactly what Kriek
suggestion does for you.

It doesn't work because the execute command keeps going on. Is there a way to stop the execute command and make the subsystem revert to the default command.

[Arhowk]

Originally Posted by inkspell4

It doesn't work because the execute command keeps going on. Is there a way to stop the execute command and make the subsystem revert to the default command.

refer back to my first post.

[RufflesRidge]

Originally Posted by inkspell4

It doesn't work because the execute command keeps going on. Is there a way to stop the execute command and make the subsystem revert to the default command.

That's what isFinished() is for.

[inkspell4]

Originally Posted by Arhowk

refer back to my first post.

Will that work even if the command takes more time to execute than the trigger is held for?

[Arhowk]

Originally Posted by inkspell4

Will that work even if the command takes more time to execute than the trigger is held for?

No.

if you use whenPressed (or whenActive), it will activate when the button is pressed and wont stop untill isFinished returns true

if you use whileHeld (or whileActive), it will activate when the button is pressed and wont stop untill isFinished returns true OR the button is released (if the button is released, the command is cancelled but the "end" method will not run and the "interrupted" method will. Keep that in mind when setting things like shooter jags)

[inkspell4]

Originally Posted by RufflesRidge

That's what isFinished() is for.

Forgot about that, Thanks

[Peragore]

Probably already solved, but what I would do is assign a flag to whether the code is required to run. so, when the trigger is pressed (>= .01, maybe), you set the flag to true. the method runs when the method is true, and at the end of the method, it sets the flag to false. Granted this is using SimpleRobot template.

[NotInControl]

Simply set the isFinsihed() method to return true;


The execute method will run once, isfinsih() will be true and then the command will call the end() method and die.