Chief Delphi - Motor Stuttering

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frc_team_4615

02-02-2015 13:27

Motor Stuttering

Hello all,

We are trying to program one of our motors to move one direction when we press a button and the other direction off of a different button. We're using a Jaguar motor controller right now.

When going one direction operation is normal but the reverse direction stutters. If we reverse the code we get the same results but with opposite directions.

If we use the joystick axis to control this movement both directions are working. We checked that the buttons are at 1 and -1 when pressed.

Things we've tried so far:

Different motor
Different motor controller
Changed which buttons were assigned in the code
Changed which directions were assigned in the code

I tried searching but was having trouble with using the right keywords. Has anyone else had this problem? Is there an easier way to accomplish the same task?

TIA

AustinH

02-02-2015 13:36

Re: Motor Stuttering

Doesn't sound like a hardware problem. When this happened to us on our first lift test, we dug through the code and found conflicting instructions being sent to the motor controller when various buttons were pushed. Can you publish some of your code?

notmattlythgoe

02-02-2015 13:37

Re: Motor Stuttering

What are you programming in? Can you post your code?

AllenGregoryIV

02-02-2015 13:42

Re: Motor Stuttering

Quote:

Originally Posted by AustinH (Post 1437310)

This was my first thought as well. It sounds like part of your code is sending 0 and then a different part is sending 1. Is the stop command from the first button always executing when it's not pressed? That would be my blind guess.

jgrindle

03-02-2015 07:00

Would you be able to post your riolog? if you're working in java or c. Also posting your code to github would be helpful, we've had a similar problem. If it's on github, it makes for other teams to help debug a little easier.

Alan Anderson

03-02-2015 09:21

Re: Motor Stuttering

I am guessing your code is doing something like this:

Code:

if button 1 pressed

  then run motor forward

  else stop motor

endif



if button 2 pressed

  then run motor backward

  else stop motor

endif

Button 2 will work. However, if you press button 1 the motor will run but will immediately be stopped by the button 2 code.

Instead, try this:

Code:

if button 1 pressed

  then run motor forward

endif



if button 2 pressed

  then run motor backward

endif



if neither button pressed

  then stop motor

endif

You might also want to explicitly deal with both buttons pressed at the same time.

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