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 Line Follower(logical circuit) using 555

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ayush26



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PostSubject: Line Follower(logical circuit) using 555   Wed Dec 30, 2009 3:54 am

Line Follower

So from the previous post of sensors we got idea how to use sensors n where to use which sensor.
so now lets proceeds and lets see how bots are made.



Here lets consider black strip of thickness 3cm. This bot is designed in such a way that when black strip comes under the LDR the correspond motor will become off. This happens when there's a curved portions. So the other motor works and robot will take turn.
We know that output from sensors is analog, so that has to be converted into digital before giving it 2 MC

Lets fisrt do it without programing, so here we avoid MC or MP so instead we need something which works logically so Comparator can be a better n cheaper option.

so now lets look back to voltage divider how it works...

so lets now assume that LDR
Rs=150k without light (on black surface)
Rs=10k with light (on white surface)
And the top resistance to be 10K(variable).so That we can adjust top resistance such that the voltage that goes to comparator is approx.

Without light: (on black surface)
Vp= *5 V=4.6875 V

With light: (on white surface)
Vp= *5 V=2.500 V
so This we have as output from voltage divider...

Comparator

so now inputs working voltage are given to the comparator(555) as shown in the fig.And the outputs that we have from the voltage divider is given to the inverting terminal of 555 and a signal equivalent to 3.5volts is given to non-inverting terminal of 555.So that when the LDR is on black strip it give a low signal(0v) as o/p. and wen it is on white strip it give high signal(5v) as o/p of 555.so now this signals is amplified using H-bridge and o/p from H-bridge is given to the motor.

Similarly the same set for the opposite side of motor is made.And assembled....
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PostSubject: Re: Line Follower(logical circuit) using 555   Mon Mar 08, 2010 11:35 pm

Nice What a Face
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PostSubject: Re: Line Follower(logical circuit) using 555   Tue Mar 09, 2010 1:23 am

wow...susu thanx...

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PostSubject: Re: Line Follower(logical circuit) using 555   Fri Apr 02, 2010 12:57 pm



Guys...this is the circuit for line follower robot using comparators...
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PostSubject: Re: Line Follower(logical circuit) using 555   Fri Apr 02, 2010 3:29 pm

hey buddy thanx...but i hav tested da circuit given by me n it worked 2....

hmm i dint put up da complete circuit but i hv detailed things der...

nyways i ll put a complete circuit soon...

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PostSubject: Re: Line Follower(logical circuit) using 555   Sat Apr 03, 2010 12:56 am

Dude..I saw your circuit..that was good..I jus wanted to give an alternate solution for that..thats all..I built this circuit for my mini project...this worked really well..But the motion of bot has been really erratic...the motion was zig zag...i think with the help of normal analog circuits like this...it is not that easy to make the bot move smoothly in a straight line..
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PostSubject: Re: Line Follower(logical circuit) using 555   Sat Apr 03, 2010 3:55 pm

yaa...but mine was not moving zigzag on da normal move but den on da turns it ws but still it ws pretty 5n...hmmm might b ur sensors wer 2 far...but still i agree wit analog it is tough 2 design a fast movng n accurate bot...

anyways thanx a lot... Cool

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PostSubject: Re: Line Follower(logical circuit) using 555   Fri Nov 05, 2010 2:15 am

The sensors made diff for u as u used i/p from 2 sensors to comparator and v know basic thing that all electronic components are diff from each other, so thr is goin to be slight diff in voltage levels even on same surface which is amplified through comparator and there is motion in bot every time and it moves in a zig zag, if u use 2 comparators then problem is solved and it moves smoothly.... with slight modifications this ckt can be used..... but it a simple one with less no. of components.....
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PostSubject: Re: Line Follower(logical circuit) using 555   Thu Nov 11, 2010 1:27 am

pradeep wrote:
The sensors made diff for u as u used i/p from 2 sensors to comparator and v know basic thing that all electronic components are diff from each other, so thr is goin to be slight diff in voltage levels even on same surface which is amplified through comparator and there is motion in bot every time and it moves in a zig zag, if u use 2 comparators then problem is solved and it moves smoothly.... with slight modifications this ckt can be used..... but it a simple one with less no. of components.....

yaa dats true i dont remember if i mentioned dat...
i used 2 diff. comparators...i dont remember da IC no. but it had 4 comparators in wich i used 2...
n yaa as i said b4 its mov ws pretty 5n except at da turns at dat pt. it ws going zig zag...

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PostSubject: Re: Line Follower(logical circuit) using 555   Fri Nov 12, 2010 12:48 am

the comparator is LM324
It works good.
I vl upload one good notes that vl help to make a good line follower..
i have collected good amount of it..
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