Picture of How To Make A Line Following Robot
Hello Instructables,

This my first time making a robot . In this instructable i will show you how to make a line following robot. Note that this a instructable for beginners who just want to make a robot for the fun of learning it. It will not be good for people who want their robot to be really fast and follow a line in less then a minute . This robot moves at a medium speed.

Step 1: Materials

Picture of Materials

For this robot you will need:
prototype board x1
-2907 transistor x2
-leds x8 (3 red,3 yellow,2 orange)
-LM339 x1
-1k resistor x2
-150 ohms resistor x 4
-Photocells x4
- 20k potentiometer x2
- DPDT switch Center off x1
- Motors x 2 (any kind of motors you would like)
- Wheels x 2 (wheels that fit your motor)
- A sandwich container, box, etc..(something strong enough to hold your circuit in)
- 9 volt battery
- 9 volt battery connecter
- Wires

- Side cutter
- Long Nose Plier
-  Soldering Ion
-  Solder
- Wire stripper

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MohammedW2 months ago
MadhuB24 months ago

Can u send me in pdf


keerthan02065 months ago

please mail me the circuit diagram my email id is akeerthan0206@gmail.com

PavansingP7 months ago

Kindly, Will Yu Be Able to send the Circuit diagram to my email please..?


PavansingP7 months ago

Kindly, Will Yu Be Able to send the Circuit diagram to my email please..?


sarangk.ikku7 months ago

Kindly, Will Yu Be Able to send the Circuit diagram to my email please..? It"ll be a boon to me.. Am starving to get the ckt diagram of Line Follower.. my email is 'sarangikku@rushpost.com'... pleez send my friend...

AbbasA9 months ago
In the diagram u use lm 393 and in the explanation u r written lm 339 please send me the diagram of ic 339 my e-mail id is abbasarshad1@hotmail.com plzzzzz quick send me the circuit diagram
karan.jeet.50511 months ago

your project is truly inspiring but i came across a hiccup.

what alternate transistor may be used as i am unable to purchase the one stated above.

its really a great explanation and really a simple 1 to understnd

mangavelli1 year ago

hey!!! This is Chaitanya.

can you explain about the connections of photo cells in depth; because it is a bit confusing here.
and what kind of photo cells did u use?

sarany1 year ago

can you pls send the circuit diag to saranyaakrishnan.95@gmail.com ..or with due respect why have not posted it right in this document ?..and can you tell me how the speed control of the motor is achieved ? ..is it necessary to use a potenetiometer ? pls do reply ..the procedure is being real easy to follow

Hey! This Circuit diagram is not of what u have explained untill now...
Plz post me the correct Circuit Diagram of this project. coz am stuck in the middle due to this.. PLease.......
Please send me the circuit diagram of this circuit. My EmailID is 18pawansharma72000@gmail.com
Mayur D1 year ago
bro....its the best explanation i got . and the most beneficial...but plzz mail me ckt diagram at dmayur57@gmail.com
botgames2 years ago
Would it be possible to email me a better copy of the schematics? I really want to make a line following robot. Your instructable looks doable. I have all the components so I'm ready to go. Thank you...tafsemail@gmail.com
anand2103942 years ago
bro....its the best explanation i got thtoughout and the most beneficial...butplzz plzz upload its ckt diagram..or mail me at anandag210394@gmail.com
Could you give more explanation about its sensors mechanism, please?
I mean how much the distance should be between the sensor and the ground and if it move away from the line what will happen?
chan4302 years ago
hi... its an awesome project... can i ask for the schematic diagram? i have all the components already... :) chan430_93@yahoo.com
can u please send me the pdf to email id- sanirudh101@gmail.com
also, where you solder, is it possible to use rubber cement? If you aren't comfortable with soldering. or, maybe electrical tape? I ask because i've made a hot air balloon and for the circuitry we used electrical tape and well. as you guessed, rubber cement.
Also, is there a specific TYPE of 1k resistor?
What is the WATT of the L.E.D's?
vizmotion2 years ago
Thank you for creating this article. I am working with my son to build this robot. I see the diagram is step 11. I almost missed it. Once again thanks.
gumfekar0072 years ago
pls send me ckt dig. sanket.gumfekar007@gmail.com
gumfekar0072 years ago
pls send me ckt dig sanket.gumfekar007@gmail.com
rcritic2 years ago
send me ckt diagram ramanujam3991@gmail.com
rcritic2 years ago
Send me the circuit diagram too ramanujam3991@gmail.com
can you plz send the circuit diagram in my mail id -ag.abhigyan@gmail.com
Plz send me the circuit Diagram in my Mail Id:-ag.abhigyan@gmail.com
hey i like the project kindly mail me the circuit diagram... my email id is Jayashree@scienceadda.in
plz send me the circuit diagram at
sagar.latti2 years ago
please send the ckt diagram...sagar.latti@gmail.com
guruthumb2 years ago
Check this easy line follower out. All schematics and code included:

plz upload the circuit diagram
and how many potentiometer do you use? is it one

plz reply.
second leg of second potentiometer is connected?where.and plz send me circuit diagram on email id


plz i am making this earlier reply will be encouraging.
great work
hey can i get the circuit diagram for this line following robot...plz send it to my mail.   
kaktus1013 years ago
hi is it possible to send me the circuit diagram please, very nice design. i like it
kirubasneha3 years ago
can you send circuit diagram to:kirubakaran1998@gmail.com
please send me the circuit diagram my email id is hemant.bhatia@yahoo.co.in
eopemipo3 years ago
This is very wonderful and encouraging, please i would like you to send the circuit diagram to my email roenih@yahoo.com and i need ur follow up to assist me in trying this project.Thanks
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