Hi..

Once I tried to do an IR communication between two chips,
I First used IR LED And Photo Transistor...
It was very hard to do, because the PHOTO IR is picking
up IR (ofcourse), and you have alot of IR Sources,
so it was always in SATURATION (high level), any
Frequency encryption is not helping, because its getting
always '1', so I Minimized its sensitivity, and it works
fine... at home... but when I Opened the window,
and sunlight got in... I Couldn't get over it...
So I Buy somekind of IR KIT To see the communication,
It appears they use a special IR Transistor, which reacts
to pulses only... So I Donot recommend you to use IR
Transistor.
Use the same type as in those KITS...

Goodluck
OK