Hello,

I'm making a small TV remote based on a 12F683.

It is not finished yet but I have a question about how important the carrier's frequency is.

I've made some test with my SONY TV at different carrier frequs, but I couldn't notice any difference in the operatin distance between the TV and the remote (it works over 8 meters). Maybe my TV is very "sensible" to any IR remote signal and this is not a trustfull test.

As different suppliers use different IR-Receivers with different specifications especially the carrier frequency (mainly between 36 and 40kHz), I'd like to know much importance is to give to this parameter.

Since the remote is going to "learn" from different remotes (= different brands = different carrier freq), I think best to adjust this freq accordingly.

Using mister_e's PicMultiCalc program, I've noticed that I can almost generate the frequency range in a 0,5kHz resolution (36 / 36,5 / 37 / 37,5 / etc).

Does anyone know if it is worth (or mandatory) to have a higher precision?

If yes, can I achieve this with a PIC easely or should I go for an external pulse-generator (or any other system)?