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PID Tutorials for Line Following

Hey there guys. This post is outdated. Visit http://letsmakerobots.com/node/39972 for the updated tutorial.

Hello LMRians,

In this writeup, I will try to create a tutorial for tuning your robot using PID to follow a line. This tutorial won't go deep down into the details of PID and its applications but will just attempt to show how a robot can be tuned with the PID parameters to follow a line.

Follow Dark and Light Lines
Using a
Tracer is a simple linefollowing robot that has the ability to follow light or dark lines. It is able to do this through taking advantage of four photoresistors. … Read more

Line Following Sensors

Hello everyone,

I am making a line following robot for a competition in Australia called "Robocup Junior". It involves following a line, also, taking shortucts indicated by a green square. At the suggestion of one of the friendly LMRians I invested in an IR Sensor board that can follow the line perfectly. The only problem I have been having is that white and green have the same readings (must be a problem with infra-RED and GREEN being different, or something:)

So I am creating this thread to see if anyone has had any experience with any light or colour (color) sensors.

Line Follow, DeskBot, IR R/C, Bump-n-Turn
Using a
Little Line and Ledge Bot   ***UPDATE 8.3.12*** Added video of desktop/ bump and turn routine (Top Video)   Read more

QRD1114 Resistor Values

Hi all,

I'm using a QRD1114 sensor for a line-follower. Datasheet: http://www.fairchildsemi.com/ds/QR/QRD1114.pdf

Im hooking it up with this schematic:

However, I'm unsure how the value for the 10K resistor was calculated? It's acting as a potential divider, right?

For the LED im guessing that the value of 220 was taken from doing:

R=(Input Voltage - Max Forward Voltage)/(Optimum forward current)

Line robot sensor

Hey guys, i want to build a line following robot and I was scouring ebay for some sensors

 

I found these but I wasn't sure if they would work, as I haven't done this before. They're pretty cheap.

Computer On Wheels Controller

Hi guys,
 
 
 
Since last week, I've been learning c++ and openFrameworks and creating a application to control any robot with a computer on it or, at least connected to one by someway.
 
It is supposed to be simple to implement and use.
You just need to run the application and program your robot to read the following chars and act corresponding to them:
  • 'w' to move forward;
  • 's' to mo

Maze Solving Robot V3. This one will work.

Not too long ago I received a care package from CTC. He sent me 2 of his arduino PCBs he designed. 

 

So that got me thinking, what would I build with it?

Well as this is going on, my highschool finally has its laser cutter installed. So it would be foolish of me not to use it. 

Here I go, making my highest verison of a robot yet. Maze Solving Robot V3. 

 

This is the fully functional test chassis for my Arduino based sumo robot. It will be competing in March, 2011. For the prototype I am using a piece of plywood to … Read more

OPB704 Line Sensor

Intro:

I have received questions regarding the line sensor that I'm using on my mini sumo bot. Here I will post the schematic and pictures of the board. 

The OPB704:

So after lots of hard-work, frustation, time, spending money on wrong parts; I built a robot. Its a Photovore based on NPN transistors. when its LDRs are pointed … Read more
Line Mazes and collision object avoidance
Using a
News (for those who don't want to read the article) -I have got one of the line sensors working. -I have got some basic line following going -I have given up on … Read more
follows a black line on a white surface
Using a
Hi guys....     Finally today arrived the last order for this robot... the wheels and the caster....   I took me 2 night of CAD-ing...   Read more

3pi

I recently bought a pololu 3pi robot and tried programming it with a USB Programmer, but couldn't get it to work with Arduino.  Does anyone know how.  Its this -> http://www.makershed.com/ProductDetails.asp?ProductCode=MKPO2

Line follower on changing contrast

I am making a line follower using an ATmega8

Now the problem is the testing of line follower, there is a black line over a white surface and then after a while, there is a white line over a black surface....

The robot will make a start on any of the corners...so it is  impossible to tell whether it is a white line or black line...and also in middle, the contrast will change...

I have to make the program in such a way that it will detect the change in contrast and continue its work

I thot this can be done in programming part..so posted here...

Line follower "GOOFY"

This is my very first line following robot that is built around ATMEGA8. Construction and circuit are quite simple. Such a name- GOOFY is given because robot movements are somewhat clumsy. But hey! Its still working and doing his job very well! :)

1.jpg

There is two geared DC motors that are controlled using PWM. Tyres are the ones that are used in RC cars. Besides-these have a nifty looking. 

How do you make a line follower?

i just want to know how to make a line follower, like the equipment needed. if there is a walkthrough, please give me the link. if there isn't, can you tell me how or give me a link to a site that does?

 ~Dulumoon

Robots...ROCK!