ine follower

[puneethsss]

Hi guys,
I am working with my friends on our project-Line follower. AS I am in IT-dept, and now in second year, I dint come across Microcontrollers yet. My lecturer advised me to use a comparator instead. Plzz help me choose. And about the sensors, is it ok to use ir sensor or a photo diode? I saw some thing about the sensors from old mouses and stuff, can i use them?? And how many? If I use the comparator, how can i control the voltage to the motors???

 

[be80be]

You can use the Ir leds from a mouse to work as light detectors you wire them backwards they will pick up light very good I have used a opamp as comparator with them the Ir transistors in the mouse don't pickup to good if it's light source is not real close.

 

[rahulcet]

if u want ur project done fast go ahead with Opamps because u will take time to learn ucontrollers. About how to able to drive motors u will need to use buffer ICs like ULN2004 or L298(H bridge). about the sensors the IR leds and photo dodes is a fine choice for a starter as range is not a big pbm for U.
Good Luck
Buddy

 

[puneethsss]

thanx guys....
i am deciding on comparators then.
and cant i use npn transistors for the motors huh??

 

[yms]

https://www.electro-tech-online.com/threads/simple-black-line-follower.42098/

 

[be80be]

you can use npn for the motor

 

[be80be]

**broken link removed**

 

[puneethsss]

thanx again guys..
one more thing! whats that comparator and bjt num plzz???

i will be back if i get stuck

 

[be80be]

A Lm339 will work and you can use a npn for Q4 and Q2

U1: LM339 Quad comparator
* D1,D4: QSD523 infrared LED
* Q1,Q3: QSD124 phototransistor
* Q2,Q4: N-challel power MOSFET
* D2,D5: Red LED
* D3,D6: 1 Amp, 50V Fast Recovery Rectifier
* R1,R6: 500 ohm
* R2,R7: 10k ohm
* R3,R8: 100k ohm potentiometer
* R4,R9: 100k ohm
* R5,R10: 1k ohm

 

[puneethsss]

right. I am getting somewhere now.
And can v simulate the circuit in the matlab uh??
i cannot find any LM339 here!!

 

[be80be]

Any comparator would just about work list what you can get I did a line follower with a 12f683 still working out some bugs but it looks good.

 

[be80be]

i cannot find any LM339 here!!

I get most of the parts from old toys and
TV VCR watch the TV it can hurt you. If you can find a old VCR you can get all you need to make a good line follower

 

[puneethsss]

@be80be..

thanx fr ur concern.
but i am living god damned hostel..
tell me a good simulater plzzz
i tried pspice and got stuck

 

[be80be]

Proteus have you tried that