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LFR V1.0 - building steps
As you probably know, a lot of robot makers have made a line follower robot, but most of them are build with only one light sensor and it means that the robot-car has to swing entirely from left to right to follow the line.

Because of this, I thought with the possibility of using a motor to move the light sensor so the robot could distinguish the black line from the white field.

I based my design on the Tribot and at the beginning I thought I wouldn't have to modify the base of the robot very much , but later, I realised that it wasn't so easy and I spent some hours until I achived a compact design with a motorized light sensor.

However, building was easier than programming. It took me some days to found a good combination of blocks inside the program that made the robot follow the line without desviations. I made some versions and the first ones were more complicated and more unstable than the final one.

Finally I added a final function: If you make a sound it turns 180º thanks to the sound sensor and starts following the black line the other way around

P.S.: you will find a video somewhere in the net

Posted by:

 cesky

Created:

 24 March 2007

Rate:

 

Tags:(?):

 line, follower, robot, car, wheeled, light, sensor

More pictures of LFR V1.0

Building steps.

Comments

10 most recent comments out of 21  [VIEW ALL]

  • cesky

  • Thank you for all of your comments.

    Now, I have posted the program as you requested.

    It can follow lines with left and right turns and the light sensor turns to both sides, but I am sure that this version can be easily improved.

  • Posted 2239 days and 10 hours ago


  • byron_b

  • um no program...

  • Posted 2236 days and 21 hours ago


  • RodMal

  • hey cesky i saw already the video of your spc2 and its awesome can you post it here with program and bi?

  • Posted 2233 days and 18 hours ago


  • legolandgirl

  • I am preparing a project for my science fair.

    I hope you won't mind if I use your project!!

    I just need a final favor: Could you post photos of the building (how you build the robot). I already started building it but I'm having some problems with the building.

    I will let you use all my projects when I finish and post them!!!

    Estefania from Mexico
    XOXOXOXO

  • Posted 2185 days and 21 hours ago


  • Murcielago53

  • Sweet! When I first got my NXT, I tried to make Ti-bot follow a line but I failed. It was really hard, I don't know what happened Tri-bot just drove in a straight line. I double checked my program and it seemed fine, so I just gave up until another day.

  • Posted 2163 days and 21 hours ago


  • scarr21

  • can you please put the building instructions in it as well?

  • Posted 2156 days and 5 hours ago


  • Murcielago53

  • I've been thinking about making a robot follow a line after failing before. My first program involved the bot turning for a select number of rotations always to the right. But that is a pretty bad idea on my behalf. But know I have a good program idea. The bot waits until black is seen. Then it goes forward for an unlimited amount of time until white is spotted, the bot stops scans until black is seen and repeats. I think that it might work. Your scaning idea inspired me, thanks.

  • Posted 2155 days and 1 hour ago


  • j8o7e6y5

  • do you have LDD(Lego Digital Designer)? If you do you can build your line follower and it makes building instructions!

  • Posted 2121 days and 0 hours ago


  • NXTTSA

  • I made my own system, LFS, so far I got 5 versions. I made one using only boolean comparisions. Moving side to side is ok, using hysteris can make it more effiecient, depending on how effiecient you program the robot, the turning might not be so much, can your program follow more then 1 type of line without programming it? I'm making a large scale project which I will call LSFS. I like your design. Good Job

  • Posted 1461 days and 2 hours ago


  • miniman661

  • why do you use motors a and b not b and c ?

  • Posted 815 days and 23 hours ago


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