Problems with LabView Default Code

[MAldridge]

hmm, sounds pretty generic, how fast is fast?

[plnyyanks]

Originally Posted by MAldridge

hmm, sounds pretty generic, how fast is fast?

As fast as you tell it to be. The error is caused by the Motor Safety for the drive code (since the error cites RobotDrive as the error's source). That means that the code has exceeded the time limit (defaults to 100 ms) set for the maximum time between updates to a motor's speed (this prevents runaway motors). Each time you set a new value to the motor, the timer is reset until the next update. You can change the timeout for the safety by using the Safety Config VI (WPI Robotics Library->RobotDrive->Advanced) and setting the timeout to whatever value you want.

But in order to solve the bigger problem, I'd recommend going through your code and trying to fix anything that could be slowing it down this much. Often, an unhandled error somewhere in your code is the culprit. Or you could have loops executing within your teleop code that cause one iteration to take too long. Or you could just have too much code in your loop and it simply takes too long to execute.

[JSzaday]

Originally Posted by MAldridge

First off the help menu is your friend. If you goto help>explain error, you can type in that error and it will tell you what is wrong. In your case, that won't help though because that is an undefined error.

I suggest that you go to the robotdrive palet and get the safety config off the advanced palet. Wire it directly after the refnum get, set mode the enable and the timeout terminal to 5.

Be aware that this makes your safety thread significantly slower, so you will need to be sure that you have a hand near the E-Stop when you are working with the robot and it is not on blocks. Additionally, if it pulsing PWM 3, then somewhere, your code is telling it that that is the correct channel to use. I suggest you go back through and re-read you code. Also, If you say that you HAD working code, perhaps you should improve your backup system.

Good luck and don't hesitate to come back if you have further questions.

Originally Posted by MAldridge

On the original issue, if you are using the KOP ribbon, you should read this:
http://www.usfirst.org/sites/default...structions.pdf
that would explain the mismatch of channels in software and hardware.

The back ups started failing after we drove the robot to a "before the bag competition." I came in to work on it the next morning and everything went wild (the robot started turning on it's own when we enabled it!). With all this talk about bad KoP ribbons, I wouldn't be surprised if that is what is causing all of our problems. Today when I go in, I will look into it. Do you know any places (like nation-wide chains preferably) where we could get a DB37 M/F Cable on the spot?

Originally Posted by plnyyanks

As fast as you tell it to be. The error is caused by the Motor Safety for the drive code (since the error cites RobotDrive as the error's source). That means that the code has exceeded the time limit (defaults to 100 ms) set for the maximum time between updates to a motor's speed (this prevents runaway motors). Each time you set a new value to the motor, the timer is reset until the next update. You can change the timeout for the safety by using the Safety Config VI (WPI Robotics Library->RobotDrive->Advanced) and setting the timeout to whatever value you want.

OK, thanks for this too, I will try and change this in the code.

[Alan Anderson]

Originally Posted by JSzaday

Do you know any places (like nation-wide chains preferably) where we could get a DB37 M/F Cable on the spot?

You can probably find one on your 2011 LogoMotion robot.

[JSzaday]

Originally Posted by Alan Anderson

You can probably find one on your 2011 LogoMotion robot.

We could, if we had one, this is our first year as a team!

[Alan Anderson]

Originally Posted by JSzaday

...this is our first year as a team!

Oops. I misread your team number as 3636. Sorry about that.

Look to local teams as resources. You might try contacting someone on Team Hammond (team 71), The Black Knights (team 135) in Mishawaka, or the RoboDogs (team 2171) in Crown Point.

[rsisk]

Originally Posted by Alan Anderson

You can probably find one on your 2011 LogoMotion robot.

I think 3936 would be a rookie number.

The DB37 cables are used in computers, try a local computer store.