IR remote control

Look at datasheet for chip like TSOP382. Note that the chip must be matched to your remote (remotes and receivers use one of few possible carrier frequencies, both must use the same). First check that you get sequence of pulsed from receiver chip. Your low-level code must record lengths of the pulses. Rest is purely software task, you need to convert time info into command. There are several different coding schemes. Hard way would be to reverse-engineer used coding looking at recevied transmissions. A variation of this could be:

- first record several specimens of commands sent by the reomote

- compute average times for each command

- in decoder compare received thing with known commands, return the best match

Of course this variation (and reverse-engineering) works only for coding scheme of your remote, if you want to handle different schemes you need to get another remote using different system.

Or you can do it easy way and look how existing libraries do it. In particulat Lirc (suggested in another message) has routines and tables of data for several coding systems.