Line Follower Robot

I made a line follower robot with PIC16F84A microprocessor equipped with 4 IR sensors. This robot can run on the black and white lines.

Step 1 First Step

Before everything you must know how to make a Printed Circuit Board and how to solder components on it. You also need to know how to program a PIC16F84A IC.
Here are the links to good instructables about making a PCB and Soldering:

• (Mostly) easy PCB manufacture
• How to Solder

Comments

[bismillah786]

Sir, my left motor does not coordinate with sensors. it is on and on does not change its state even with the mode buttons so what can be the fault...if you can give me some suggestions please...would be very thankful to you!!!

[vahid_you2004]

Remove PIC from its socket, use a piece of wire to connect +5V pin to pin 6 (B0) of PIC the left motor should run backward, now test forward run by connecting +5V to pin 7 (B1), by this way you can check that you have no problem in you circuit.
If you made your sensors yourself you must place a dark thick plastic wall among IR transmitter and receiver, I suggest to use a piece of aluminum foil as the wall.

[bismillah786]

is it must compulsory for placing a wall or a strip of paper between IR transmitter and IR receiver

[Shadow Killer Ninja]

can i use simple infra red sensors???

[vahid_you2004]

Yes, you can build you own sensor using an IR transmitter and an IR receiver. (look at below comments)

[bond31]

hello sir! can u please send us the schematic diagram?
its urgent

[vahid_you2004]

I have no exact circuit diagram, but there is a symbolic diagram you can find in below comments.

[ajefferson2]

I am very intrested in making this project. Could you please upload the schematic diagram...plz

[vahid_you2004]

I did not draw any circuit diagram, my diagram is just a symbolic diagram you can find in below comments.

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[vahid_you2004]

By pressing the mode button (button on the front board) you can switch between 3 modes:

• Mode1 (Mode LED is off): In this mode robot follows a line using the algorithm in the program and you did not need to do anything.
• Mode2(Mode LED is on): In this mode robot follows a line using the algorithm in the program but you can customize the motors state (for example if the robot placed on a turning to left, the left motor became off and the right motor runs forward, hold the robot in this state with you hand, now you can change this behavior by pressing motors buttons, for example making left motor run backward and make right motor run forward to turn faster and etc).
• Mode3(Mode LED is blinking): This mode is the same as Mode2 but the robot ignores algorithm in the program and changes the motors just according to the sensors state.

[ajefferson2]

thnk you sir,,,

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[nikolas10]

Can anybody help me? Could the robot be made to reverse around a track ? How could this be achieved and what changes to the logic might be required?

[vahid_you2004]

Press the Mode button to make its LED on, hold the robot over the path and move it backward with your hand and change the motors direction in different states with motor buttons, now it can follow the path reverse. I tried to do it myself but it could not follow the sharp turnings because the sensors are in the front of the robot, if you make the robot with sensors on the middle of it you will get better result.

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[Shadow Killer Ninja]

Sir, Please tell me in detail that how to change the states, if possible with pictures because i have made it but dont know how to change the states....i have entered a contest so require reply urgently....

[physics89]

hello sir ... i am a physics student and i need a project for my last year . but i like to introduce this ... but have no idea where to start or if i can do it .. help

[vahid_you2004]

Hi, Thanks for your choose, I think is is better to start with introducing the line follower robots basics and principles, then go to mechanics, electronics, and digital control, then try to design and program an optimized robot.

[bbantia]

its not working sir what u said i did sir is this ture it will worj

[qualia]

you missed a bit...

[vahid_you2004]

I can't understand what you wrote, please describe more.

[yeop]

hiii.

can u sent me the project details to my email?? [e-mail]...thanks vahid

[ursshivani]

sir plz send me schematic diagram of this robot its very urgent sir.........

[vahid_you2004]

I have no exact circuit diagram, but there is a symbolic diagram you can find in below comments.

[rkumar30]

is this is for all colors guys

[singer9]

i dont get sensors

[vahid_you2004]

You can make one yourself. See below comments...

[acooper3]

i made one in year 11 i made it so it could tell if it was on a black or white line

[tave03]

Is over.....just I have not found the L298N .... can I connect the motors directly to circuit ????

[vahid_you2004]

No, L298 has 8 transistors to drvie 2 motors (4 transistor for each motor) you make a simple L298 yourself using 8 TIP122 transistor just download and see the L298 datasheet, and search the internet for "H bridge". http://forum.allaboutcircuits.com/cache.php?url=http://www.markallen.com/teaching/images/electronics/hbridge.gif

[tave03]

(removed by author or community request)

[vahid_you2004]

The L298 IC on the board has 15 Pins too!

[tave03]

I can replace 1 Infrared led and 1 phototransistor instead of a sensor ????

[vahid_you2004]

Yes, this sensor is actually 1 IR LED and 1 IR phototransistor with a wall among them.

[tave03]

thanx it's nearly finished

[tave03]

sorry.. I didn`t find the complet circuit diagram.. you can show me that please

[vahid_you2004]

I haven't a complete digram, I'v posted someone else a simple symbolic digram in the comments; I hope it can be helpful.