Hello,

I've been looking around this forum and the Internet about basic information on IR communication. But there's so much information I can't make up my mind what kind of components I should get started with and, hence, what software method I should apply.

For a start, I have 2 questions.

A.- As IR-emitter, one use IR-LEDs. As IR-receiver, one can use IR-LEDs, phototransistors or IR-Modules. What makes the difference between all these receivers?

B.- Some IR-LED's datasheet mention pulse frequencies (mostly 38kHz and 40kHz), other don't. Why, what's the difference between those LEDs?

Here are some of the sites I already visited:
http://www.rentron.com/Infrared_Communication.htm
http://www.winpicprog.co.uk/pic_tutorial5.htm
http://www.ustr.net/infrared/infrared1.shtml