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From: email@example.com (Simon J Fisher)
Subject: Re: RC5 Encoding/Decoding project.
Date: 23 Sep 2002 01:11:03 -0700
NNTP-Posting-Date: 23 Sep 2002 08:11:04 GMT
"j.f.palmer" wrote in message news:...
> I'm a student studying electronic engineering in Southampton England,
> For my final project of my degree I have been given the task of designing a
> security camera control system for use by the general public. The system has
> to be able to accept inputs from various sensors such as PIR and IR beams.
> When a sensor is triggered the camera moves to point at the position of the
> triggered sensor. This bit should be easy, I'm using a PIC chip and a
> stepper motor. However......
> The problem I am having is that when the camera is triggered it has to send
> an IR remote control signal to a VCR hooked up to the camera to tell it to
> record. The recording lasts for 2 minutes then a stop signal is then sent.
> On switch on the unit has to learn the remote codes so that any VCR can be
> used. I.e. by pointing the VCR remote at the unit and firing in the codes
> for stop and record.
> Does any one know if there are any dedicated IC for encoding and decoding
> the RC5 signals so that I can simply interface them to the PIC chip? I know
> philips made an IC but it is now discontinued. Could making the PIC store
> the codes be the best way to go?
> Thanks in advance..
> John Palmer
> P.s. Does anyone know how available electronic engineering jobs are in
> America? I'd like to emigrate after I qualify.
You may want to think about using the scart pin 10 data protocol
rather than infra red to control the VCR. This will give you a much
larger range of VCRs you can use (different VCR mfrs have different
names for this Panasonic=QLink, Philips=EasyLink, Sony=SmartLink,
Hitachi=ViewLink etc.). You will also not need to worry about the
extra components, as I imagine you'd be using a scart connector
anyway. Let me know if you need more details about the data protocol.
Failing that why not drive the IR LED directly and use software to
make the RC5 waveform? Shouldn't be too difficult to transmit.
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