----------
From:   Steve Hardy[SMTP:hardy@SWENG.STORTEK.COM]
Sent:   25. september 1996 19:49
To:     Multiple recipients of list PICLIST
Subject:        Re: Need code to generate RC-5 infra red

> From: John Payson <supercat@MCS.COM>
>
> > Since some devices will not perform the requested function if the code
> > is received only once (especially RECORD), it is best to repeat the
> > same code 3 or 4 times to be sure, to be sure...
>
> Another difficulty which has caused me grief in my efforts to find a good
> universal remote for my home system is that at least one brand of stereo
> receiver (my Magnavox unit) uses at least two different codes for every
> button and repeated button pushes generate different codes.  So if the
> "5" key on the remote has codes "f" and "F" and I punch in "555", the
> remote would send out
>
>       fffff      FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF     ffffffffffffff
>
> Although this is a good design and provides excellent debounce properties,
> it means that a universal remote would have to know two (or more) codes
> for each button as the main unit will ignore any invalid key repeats.  I
> don't know if any other devices use such a scheme (I'd like it myself if
> I could program a remote to deal with it) but you might want to watch out
> for it.
>

On an old Grundig remote I have for a (just as old) television, the transmission (when a button is pressed) begins with one code, a break and then another. The last code is then transmitted repeatedly until the button is released. The first code might be for 'waking up' the standby unit in the receiver?

Ah, so it's not my imagination!  I noticed this 'feature' on my Rotel CD
player.  I will have to add knowledge of this to my control.  Thanks.

Have you any ideas of how to do that? I guess its no problem when the code allready have been 'learned' and stored, but what about the first time when its about to be stored?
Furthermore, what about the 'toggle' bit in the RC-5 format which toggles everytime the (same) button is released and depressed? If you learn one of the codes, ie. toggle-bit set to ex. 1, it'll present problems as the receiver won't be able to separate an IR-break, or a depressed button (will present a problem when muting, among others).

Regards,
SJH
Canberra, Australia


Regards
Jacob Blichfeldt, Denmark