Or the cheapest receivers you will get are these
1) TSOP1738 - 38Khz - Vishay Telefunken
2) SFH506-38 - 38KHz - Sony
These are used in TV's for remote singal reception and so are the most common.

With that you should use IR LEDs and an oscillator which drives these LEDs at 38kHz. Both these receivers, when detect a carrier signal of 38kHz pull its data output line low and in absence of cariier it is high.

You can use this method to avoid interference of ambient light on your system since it uses modulation.

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"There is no way to peace, peace is the way!"

 

thanks again guys.

vish_beatle, what are the sites that i can check online?

 

if you want datasheets for components that you already have, u can search www.datasheetlocator.com

if you want to buy the products online, there are a host of sites, i can't give you many names offhand.

kinjalgp suggested TSOP1738 - 38Khz - Vishay Telefunken

u can get that on www.vishay.com

texas instruments has a homepage i don't remember the link i think its www.texasinstruments.com or www.focus.ti.com do try both!!

as for the rest, you can always do a google search, for eg. motorola components...something like that...you are sure to land up with a few good sites!

good luck on your search!!!

 

Just add a green button in the way in so each one press that putton when entering the room. Count up!
Another red button in the way out so each one press it when leaving the room. Count down.
Easy! :lol:

Nilo

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Nilo