We are also having these issues with our robot. On Tue, Oct 23, 2012 at 7:16 PM, Bob and Ann Henshaw <[log in to unmask]>wrote: > I am a 5 year veteran home based coach with a 2nd year team of 10 year > olds. We are working with a Mindstorms NXT system that we purchased new > last year, with a fully recharged battery. We are experiencing several > intermittent erratic behaviors (listed below) that is driving our team > crazy. Please let us know if you have any debugging suggestions.**** > > ** ** > > Observed behaviors:**** > > ** ** > > **1. **After completing a planned series of instructions, with the > last instruction having 2 wheels turning equally (straight line), the robot > suddenly makes an additional turn (one motor, rotating robot about 30 - > 40degrees). This occurs even after deleting the program, recompiling and > redownloading it, and even after adding an all motor stop block to the > program. Our team is referring to this as a ghost and are convinced that > the robot is now haunted, just to get us in the Halloween mood. **** > > **2. **The robot, using a two wheeled turn (one motor going > forward, one going backward) intermittently turns too far or too short. > Programming is being done in rotations for both motors. Because both motors > are running together, I canít tell if it is related to the problem above. > This occurs about 1 in 5 runs.**** > > ** ** > > I do not think that this is a cable issue, as we are not seeing anything > beyond the usual minor navigation errors due to lineup, wrinkles in the > mat, etc. That leaves the motors and the NXT itself. Could this be a bad > servo motor and if so, is there any way to test them? **** > > ** ** > > Appreciate your suggestions!**** > > Sincerely,**** > > Bob Henshaw**** > ------------------------------ > To UNSUBSCRIBE or CHANGE your settings, please visit > https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or > leave the list". > VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. > Visit https://listserv.jmu.edu/archives/vadcfll-announcements-l.html to > subscribe. -- *Amy Sabarre PK-8 STEM Coordinator PK-4 Science Coordinator * *HCPS* *One Court Square* *Harrisonburg VA 22801* -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. Visit https://listserv.jmu.edu/archives/vadcfll-ANNOUNCEMENTS-l.html to subscribe.