IR sensors too noisy for line tracking - Electronic Circuits Projects Diagrams Free

shehry · 11th December 2005, 02:10 PM

Hi,

i am designing a line tracking robot system. i was trying to detect the
difference b/w black and white using an IR sensor. Now the problem is
that the sensors are fairly noisy. and the voltage difference is very
minute...about .1V. Now, i dont want to use an amplifier since that
would amplify the noise too. so i want a way to reduce this noise and
so be able to detect the voltage by then using an amplifier

can anyone help me in this regard.

thanks

fsahmed · 11th December 2005, 02:23 PM

Ever wondered why ur TV remote always makes the TV do what u want through IR, regardless of noise (under normal conditions...)??? Try searching for IR modulation.

Kingpin094 · 19th December 2005, 01:51 PM

How far are they from the surface the line is on?
Most of the time this needs to be small as in less
a few mm.

What type of circuit are you using?

addyismad · 22nd December 2005, 07:24 PM

modulate the ir wave.....
it works retty fine and gives u a clear diference of about 2v....
use suitable resistors in the ckt. to get gud fall in voltage on reception of ir.
u can also use top17xx, works gr8 for ir's......

ASKANA · 1st February 2006, 08:53 PM

if u havn't still made the ckt can i make a suggestion ?

use the ir transmitter in series with a 220 ohm (or any value) resister and the transmitter in reverse biased with a 33K or greater value resister now , when the signal falls on the receiver the swing should be from 0.3v to 4.8 v if the supply is 5 v . take the o/p from the anode of the reciever.

My sincere advice if u r makin ckt and is very urgent never go for TSOP as the whole thing sucks !

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11th December 2005, 02:10 PM	(permalink)
shehry	IR sensors too noisy for line tracking Hi, i am designing a line tracking robot system. i was trying to detect the difference b/w black and white using an IR sensor. Now the problem is that the sensors are fairly noisy. and the voltage difference is very minute...about .1V. Now, i dont want to use an amplifier since that would amplify the noise too. so i want a way to reduce this noise and so be able to detect the voltage by then using an amplifier can anyone help me in this regard. thanks

11th December 2005, 02:23 PM	(permalink)
fsahmed	Ever wondered why ur TV remote always makes the TV do what u want through IR, regardless of noise (under normal conditions...)??? Try searching for IR modulation. __________________ F. S. Ahmed

19th December 2005, 01:51 PM	(permalink)
Kingpin094	How far are they from the surface the line is on? Most of the time this needs to be small as in less a few mm. What type of circuit are you using? __________________ Dude, no way!!!!

22nd December 2005, 07:24 PM	(permalink)
addyismad	modulate the ir wave..... it works retty fine and gives u a clear diference of about 2v.... use suitable resistors in the ckt. to get gud fall in voltage on reception of ir. u can also use top17xx, works gr8 for ir's...... __________________ absence of evidence is not evidence of absence

1st February 2006, 08:53 PM	(permalink)
ASKANA	if u havn't still made the ckt can i make a suggestion ? use the ir transmitter in series with a 220 ohm (or any value) resister and the transmitter in reverse biased with a 33K or greater value resister now , when the signal falls on the receiver the swing should be from 0.3v to 4.8 v if the supply is 5 v . take the o/p from the anode of the reciever. My sincere advice if u r makin ckt and is very urgent never go for TSOP as the whole thing sucks !