In this instructables I will show you how to make a line tracer robot without using any kind of microcontroller.
It is basically works on the property of reflection of light is greater from whiter surface than black surface. Hence when the robot sensors on the black path it receives less light than desired quantity of light and hence the motor stops rotating.


STEP 2 components
To make this robot you will need the following components:
1.LM358 op-amp chip
2. 220 ohm resistors  x  4
3. 1k resistor    x  2
4. BC547B transistor (NPN)  x  2
5. white LED    x  2 
6. red LED   x  2 
7. 3 or 6V DC geared motors  x  2 
8. copper clad circuit board or protoboard
9. 100k pot   x  2 
10.5k pot   x  2 
11. photo-diode   x  2 
& now you are ready to make ur project…  
<p>where i get the code?</p>
<p>no code dude just simple logical circuit only</p>
its nice.. but i have a doubt in my mind that how the robot takes right and left turns ...that is i want to ask , that suppose the track is turning towards right then left sensor will sense that there is no black tape in front of it then how it activates the motors to make a turn please explain me sir ..... and if you get time then please email me at navjotacharya@yahoo.com explaining all the things in details. also add the pdf . as i am not the pro member and hence i was unable to download it.. please help me sir. thank you for listening me.
When the track is turning right then right sensor sense the black tape &amp; left remains on white. So the right motor turns off but left is still moving. hence robot turn to right. at that time when right sensor senses white both motor starts and it moves straight again travelling little distance on turn the right senses black and turn towards right. this cycle is repeated very rapidly and you will see that its turning smoothly to right/left.. :)
<p>nice bro..............</p>
<p>nice bro..............</p>
Can i use LDRs instead of photodiode?
Sir it will work in bread board
,SIR, we've tried this in breadboard, we used photo diode(receiver) but whenever the motor is rotating and the output led is switched on, the IR led beside the photo diode is not luminating, and whenever the IR is luminating, the motor and the output LED is not working. Can you help us? please? we've followed your instruction about the photodiode.
how and where to connect wires from the pcb to the sensor. <br>i don't no the wiring plezzz can u tell me or can u post a video <br>also what type of motor should i use plezz tell me as soon as u can
i jst lv this site bcoz i lv robots
i mean what goes where <br>
NICE! how bout a vid?<br>
watch out the video... :)
i ll try if possible
ca you please tell me what is sil and where to connect the eyes of the robot to the body please<br>
the eyes i.e. sensor have to connect at front part of robot... u cant connect it 2 back side because it causes problems and complications while turns..<br>refer the given images carefully..!!
nice project. . can u please tell me the complete details that how it makes and how it works because i determined to make this project as my final year project of computer engineering. . plzzz tell me about this<br>
when photodiode recives light frm white floor it activates the op-amp and output from op-amp activates transistor.<br>trans. acts as on-off switch to the motor. when photo diode on black path it switch offs opamp i.e. 1 motor and 2nd motor is runs due to sensor on white floor..<br>on turns due to rotation of only 1 motor robot can also turns..
Nice project!!... can you explain a little how it works please. Im kinda new to all this<br>Thank you!
Can U Tel Us Why U Had Put Some Gray Spots On Black Strip..??
ohh..!!<br>its a black tape and gray dots are actully name of company of black tape..!! :) :)
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About This Instructable




Bio: Electronics is my passion...!!!
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