Sample time? (read sonar halts)

[Alex_Petersen]

I have a very simple program, that reads the distance from the Sonar-sensor. If the distance is above 20 cm, the motors A and B will turn backwards until the distance is above 20 cm.

This works just fine in debugging-mode, but not when the program is targeted to the NXT itself. I think this has to be something about sampletimes? I can add a Wait for 200 ms" and its get bettet. But there must be some kind of documentation about this?

Any thoughts is appriciated.

Regards, Alex.

[A.Rohde]

Hi Alex

It should not be nessasary with a wait function.

Could you please check if the following example program works on your device:

Help --> Find examples --> Directory Structure --> NXT Robotics --> Motors --> Case_Structure_Motor_Control.vit

It has approximately the same structure as your application.

Best Regards,

Anders Rohde

Applications Engineer

National Instruments Denmark

[Alex_Petersen]

Hi Anders.

Thank you for your reply.

The example program works just fine. It could seems like the Read Sonar is different than the other Read sensor? I found another guy with the exact same problem:

http://stackoverflow.com/questions/8404029/why-does-this-program-work-in-labview-when-targeted-to-co...

Regards, Alex.

[Alex_Petersen]

Anyone?

[A.Rohde]

Hi Alex

What version of the NXT module are you running?

[Alex_Petersen]

I'm using LabVIEW 2011 with the LabVIEW NXT Module 2011.

Downloaded from:

http://joule.ni.com/nidu/cds/view/p/id/2637/lang/en