IR sensors too noisy for line tracking

[shehry]

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]

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]

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]

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]

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 !