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How to use Infrared sensor ?

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bianchi77

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Friends,

I want to use Infrared sensor for Line follower robot, but the output of the sensor always LOW,
How can I change it ?
Line Follower1.jpg
Line Follower2.jpg

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,
 

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 ?
sensor.jpg
 

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.
 

FvM said:
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.
Click to expand...

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 ?
sensor2 (1).jpg
sensor2 (2).jpg
 

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

65_1337172852.gif
 

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

65_1337172852.gif
Click to expand...
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...
 

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