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IR remote control with serial (RS232) interface

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Thomas Schmid

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Apr 3, 2002, 6:42:40 AM4/3/02
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Hi there,

I try to automate my home an so I'd like to have a Infrared remote
control
(to control home equipment like TV, HiFi a.s.o.) which is controlled by
a PLC over a RS232- Interface.
The problem is now, that this remote control must have its own
intelligence for generating the Infrared signal,
because the PLC ist not able to generate so fast signals (ca. 40 khz
IIRC).

Can anybody help me?

Thanks,
Tom

Dave Schoenwetter

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Apr 3, 2002, 8:17:18 PM4/3/02
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Thomas Schmid <scth...@gmx.at> wrote in message news:<3CAAEAB0...@gmx.at>...
Tom,
The 40 khz is the carrier frequency on the LED. You could produce a 40
Khz signal with a simple circuit and AND the signal with the data from
the RS232 or PLC.
There was at one time a freeware program that would read signals from
a remote control (with some added hardware) on the RS232 port and
store values for each key sampled. Then (with some added hardware) the
program could reproduce these signals to control devices as though the
remote was being used. The hardware needed to read the remote was a
Radio Shack I/R sensor and ttl to RS232 converter. To send the signal
it required a RS232 to ttl converter, 40khz osc. 1 AND circuit and an
IR LED. If I can find the program again I will let you know.
Dave
Dave

Thomas Schmid

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Apr 4, 2002, 2:45:51 AM4/4/02
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Hi Dave,

you wrote:
> The 40 khz is the carrier frequency on the LED. You could produce a 40
> Khz signal with a simple circuit and AND the signal with the data from
> the RS232 or PLC.

Sorry, my explanation was wrong: The problem is to generate the high
frequency of the signal (and not the carrier frequency = 40kHz),
because the PLC is only able to switch Outputs in at least 3ms.
That means, I'm looking for a remote control which generates the signals
itself and the PLC says which Code should be generated (preferably over
RS232).

> There was at one time a freeware program that would read signals from

(...)


> IR LED. If I can find the program again I will let you know.

I already know this sort of "software-remote-controls". They generate
the
signals in the software and not in the hardware. As described above,
this is my problem.

Thanks anyway,
Tom

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