Remote controller reverse engineered

Do you remember the DVD player I’m using? It’s salvaged from junk basically, and was repaired by replacing the whole power supply with a ATX p/s. The most annoyed problem of this machine is it’s lack of remote controller. That’s vital because you can’t do fast forwarding, rewarding, changing subtitle, etc. without remote.

I tried that sort of N in 1 remote controller, but without success. Apparently this ‘Universal’ brand dvd use some kind of property protocol.

Luckily, one of my friends has a dvd which is based on similar design (sunplus). The remote controller came with that dvd can be used to control my dvd somehow. Several buttons works but with different functions.

Then I used OmniRemote to record that working button signal, and looked in the database produced by OR. It is found that my dvd actually use NEC protocol with Address code 0×00FF.

Working out exact key code is a pain because you basically need to transmit all possible key codes manually to check out the corresponding function. I use my Sony Clie handheld with Clie RMC to check the code. RMCEnhancer is very useful to produce customized IR code library.

Two nights, problem resolved.