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[SOLVED] Infrared RX-TX 1m Distance Desing

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xxtigerxx

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I want to make a infrared receiver & transimiter to detect any obstacle.

The distance it can be from 0.5m to 2 m!!

Do you have any designs?
 

xxtigerxx

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Thank you emresel for you suggestion but i have the IR transmitter and the IR receiver.

I need a schematic with a opamp that rejuct the noise.

;-)
 

kak111

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First of all...........
You need a carrier frequecy in transmitter
and receiver circuit tuned to that frequency.

KAK
 

xxtigerxx

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The Ir Led are fixed because are fitted to an elevator door.
And both RX and TX led have 1 or 2 meters long cable to connect it to the PCB.
Because the cable for the receive led is long get a lot of noise from the environment.
I tried to make a schematic like the one below and it got a lot of noise from the environment.



The IR transmitter have 150mA current consumption.
If you need any other information please ask me.
 

FvM

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The amplifier as such is O.K., you would want a selective filter tuned to the Tx carrier, as already mentioned. But most likely, it's no good idea to connect the receiver through a long cable. Industrial sensors have the amplifier mounted to the receiver for a good reason. If you try anyway, a screened cable, screen preferably separated from signal return would be needed.

You should also consider, that a good optics is the best amplifier.
 

xxtigerxx

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Yes both cables have screen.

but at the aplication i can not put the amplifier near the receiver :-(
 

FvM

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After some filtering it should work. 2m isn't actually a large distance, standard remote control achieves 5 to 10 m without special optics.
 

xxtigerxx

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i send form the TX a pulse of 8KHz and from the RX i receive the data.

RX led has a big bias and i amplifie the ac signal.

It is working up to 3-4 meters.
 

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