"sorry Elac, I answered before reading your post. Of course you are right. The demodulating frequency is of crucial importance but receivers work in a frequency range, for example the one I posted works between 35 and 41KHz, but for 38KHz you get…"
"the part that you send the link, is a transmitter, not a receiver. So how do you expect to "read" the codes?
to do so you need an IR sensor like this in that tutorial (http://learn.adafruit.com/ir-sensor)"