How to use Infrared sensor ?

Friends,

I want to use Infrared sensor for Line follower robot, but the output of the sensor always LOW,
How can I change it ?

Thanks

Hi,
Can you specify your IR sensor and IR transmitter ?
If your sensor is 38kHz, do you correctly use 38kHz pulse in transmitter ?

Thanks,

It's using Op amp LM339 similar to

May be I need calibration ?

Thanks

It's using Op amp LM339 similar to

May be I need calibration ?

Thanks

How can I make it "High" it's always "Low", when I lift the car in about 10 cm it's "High"
Is it white line follower robot ?

Why are you using the photodiode in photoelement - voltage mode? It's the least sensitive circuit you'll find and exposing a diode temperature coefficient to cap it all.

How can I make it more sensitive ?
there's op amp circuit in it.. I tried to adjust but no luck

I put white paper facing the sensor and without white paper, it's the same result as in the photos,
do you have idea on adjusting it ?

If nonmodulated DC light sensor is sufficient, you can try this circuit. It works with LM324 and single supply voltage.

I don't have the chip and the PCB I have only LM339 with those sensors.....
I will try to make it work....rather than trying other circuit....

---------- Post added at 14:06 ---------- Previous post was at 14:02 ----------

It works with black duct tape....I tried just now...