com port errors

[chakslord]

Hi,

I am using arduino UNO to control servo motor. I am using 2 servos operating on 5v of arduino. I have installed everything required for interfacing arduino with LABVIEW. I have assigned com3 for it.

After uploading LIFA_BASE on arduino when i run my vi file my servos starts vibrating and shrinking. When i enter some angle it responds after a delay . But the main problem is when i stop my vi file the there is ahuge delay in stopping the process and when i upload another programme on arduino it shows 'com3 not found'. and it works again after i disconnect arduino from computer and remove all connections.While running the servo example in help nothing such happens.

Please solve it.

[CarlosOtiniano]

dear friend watching your code, you can see that your program is entering a race condition, so it is not possible to predict which of the two servos are activated first, could use a sequential extructura to determine which one of the two active few milliseconds before the other, also could use programming thread attached useful reference

http://www.ni.com/white-paper/7585/en 

http://zone.ni.com/devzone/cda/pub/p/id/1054 

[Nathan_B.]

To fix the race condition, always put Ardunio VIs in-line (wire each Arduino reference Out to the next Arduino Reference In).