Performance (line following vs. robot speed)?
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Author:  SuntzuMaster [ Wed May 09, 2007 8:22 pm ]
Post subject: 

I forgot to tell you that the light sensors are not all equal in front of god!

For instance white is = 68 with one sensor and = 69 with the other sensor that is an issue from PID standpoint. I had to adjust the error value factor to 0 when I have a difference of 1 between my two sensors! at best I should maybe always do -1?

Author:  Dick Swan [ Wed May 09, 2007 9:21 pm ]
Post subject: 

Steve Hassenplug is a master LEGO robot builder and has a great site. Take at look at Steve's site at

Here are some other videos / pictures of line followers. Mostly from Steve. -- a great video of a really fast Mindstorms (RCX) line follower. Three light sensors.


And download the movie at and play to see a balancing robot following a line. NOTE: I had to download the file to my PC and then open it. When I tried to view in Internet Explorer all I got was audio.

Also -- line follower navigating a maze. -- with a pen trace of edge following.

Author:  JamesD [ Thu May 10, 2007 2:00 am ]
Post subject: 

Thanks guys, it is fabulous to see the quality of responses in this thread.

Another question I have relates to whether anyone has experimented using the HiTechnic colour sensor to follow a line? I guess it would invalidate the use of PID, but 2 of the sensors could be used in a more traditional/simpler line straddling formation.

Without having to purchase and test them myself I was hoping to get some feedback as to the likely strengths and weaknesses of using normal NXT light sensors Vs HiTechnic colour sensor to follow a line.


To admin (If this should be moved onto a new thread please move it)

Author:  SuntzuMaster [ Thu May 10, 2007 2:54 pm ]
Post subject: 


I have two HT Color sensors and it is in my test plan to use them with my robot... I have done some tests and they return a value that is linked with a color. I have to do more test...


Author:  salmanq [ Wed Aug 08, 2007 5:32 am ]
Post subject:  Hi

Hi, This post is very informative, however I would like some specific information. If someone can help me then please send me a private message. Best Regards

Author:  elemes [ Thu Nov 15, 2007 3:57 pm ]
Post subject:  ASURO (german robot) following a line

Here you can see the speed of a very naked robot (not lego)

camera is badly shaking and I'd prefer the motors noise to this music but you can see the speed of it.[/url]

Author:  elizabeth.mabrey [ Wed Nov 21, 2007 11:52 am ]
Post subject:  speedy line tracing

very impressive. Is it a kit or you make it from scratch... like from bread board, make your own circuit board and all?

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