How to build infrared detector...

[chithanh04dt2]

Can you help me?   
I want to use infrared LED as an electrical circuit can feel the presence of man in space 40 cm. Sorry because I do not speak English very well

[ajak]

Sure, i can help you..

this is the answer to your question..
http://www.seattlerobotics.org/encoder/200112/richk.htm 



ask question but also share your knowledge too. 

sonsivri the best forum...

[chithanh04dt2]

I have tried do but about how income and very short. How about ways to increase revenue in the infrared LED?

[ajak]

if you like to know more about infrared proximity sensor, you could also read this:
this could help you and decide what you like to build.   

http://www.ikalogic.com/ir_prox_sensors.php
http://www.ikalogic.com/ir_prox_sensors_40khz.php 

sonsivri the best forum......................... 

[TomJackson69]

Can you help me?   
I want to use infrared LED as an electrical circuit can feel the presence of man in space 40 cm. Sorry because I do not speak English very well

Hi Thanh,

Why don't you use photo sensor? it could be easier than use IR; since the distance you required is very close (only 40 Cm). Put the photo sensor (or RTS) in an enclosure and drill a hole for sensing. The size of the hole and the amplifier will allow you to adjust the sensitivity of the detector.

Search on the web for it. I am sure there are plenty of the circuits.

Go here: http://www.electrokits.com/photo/sensor

Go here for "Visible Light Photo-Detector Circuits - Basic Phototransistor Detector":
http://home.cogeco.ca/~rpaisley4/PhotoDetectors.html

Good luck,

Tom

[Jehan]

one of my friend had made a security prip using a Laser pointer and a LDR, try if this can work for you, the laser pointer can give a very straight beam and the distance can be increased

[oscareev]

In this site information spanish infrared

http://www.futureworkss.com/tecnologicos/electronica/cursocad/barrerainfrarrojos.htm

regards

cali - colombia

[abcsantosh]

Hi, see below links for Infrared Motion Detectors. The site has good explanation and applications too.

http://www.glolab.com/

http://www.glolab.com/pirparts/pirparts.html

http://www.glolab.com/pirparts/infrared.html

Have a Good Day