Subject:
|
Re: ir tower -> consumer electronics
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Fri, 28 Apr 2000 06:14:19 GMT
|
Original-From:
|
Johan Pollet <johan.pollet@alcatel.beNOMORESPAM>
|
Viewed:
|
530 times
|
| |
|
|
There is a good very good information under http://come.to/8051
and check out the section infrared .
Rgds
Johan
John Barnes wrote:
>
> Either I'm missing something, or there's a fundamental
> error in people's understanding of "IR".
>
> The "IR" in question is simply a transmission medium, which
> conveniently modulated in the 25 - 50KHz area can be detected
> against a background of low frequency light sources souch as
> household lighting etc.
>
> This modulation is in turn modulated at a "bit rate" convenient
> to the system its being used for, such as a tv or VCR remote
> control.
>
> What I don't understand is why you would expect an RCX transmission
> which is a bit encoding of standard computer style RS232 serial
> data at 2400 bps encoded as 10 bits total, start, 8 data and stop
> to match a proprietary transmission standard hatched by a tv or
> vcr designer who has no reason or need to use start bits, stop
> bits or 8 bit bytes! (After all, they owe their heritage to
> teletype machines!)
>
> I suspect univeral remotes that learn, learn bit patterns and
> nothing else. I know you CANNOT make a PC serial port do this.
> I don't know enough about the RCX's serial port but I suspect
> it is also using a UART of some kind, in which case it will
> not be able to transmit or receive arbitrary bit patterns
> either.
>
> Lego sell a perfectly usable remote for the RCX. I use mine
> all the time.
>
> JB
>
|
|
Message is in Reply To:
 | | Re: ir tower -> consumer electronics
|
| Either I'm missing something, or there's a fundamental error in people's understanding of "IR". The "IR" in question is simply a transmission medium, which conveniently modulated in the 25 - 50KHz area can be detected against a background of low (...) (24 years ago, 27-Apr-00, to lugnet.robotics)
|
3 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
