Sujet : Re: Ir remotes
De : sala.nimi (at) *nospam* mail.com (LM)
Groupes : sci.electronics.designDate : 20. May 2024, 22:07:54
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <c3bn4jl6jntj2th4cecm329il1l8kk5tc8@4ax.com>
References : 1
User-Agent : Forte Free Agent 3.3/32.846
On Mon, 20 May 2024 00:01:18 -0700, Don Y
<
blockedofcourse@foo.invalid> wrote:
My understanding is that Ir remotes modulate an Ir "carrier" signal
in a particular pattern to express a particular "code" corresponding to
the key pressed/held.
>
And, that different "chipsets" use different carriers and encodings.
>
Is there a front-end that is tuned to the particular carrier
in the receiver? Or, is all of this done "digitally"?
>
I.e., with a fast-enough (Ir) photodetector, should I be able to
decode ANY signal from ANY "remote"?
>
Said another way, is the fact that a particular device ONLY
recognizes a particular remote related to its use of a particular
chipset (or, equivalently, decoding algorithm in software)?
>
[The former would be hard to change but the latter should be relatively easy]
Are you looking for something like this:
https://en.wikipedia.org/wiki/RC-5Years ago a long range remote used IR leds which could take 1A
current, but only for a microsecond or so. Microsecond pulses were
modulated with 33-38kHz "carrioer" and that was keyed with data,
around 1-2kHz.
There are dedicated deceiver modules which can output that data