From: Keith Wootten
Subject: Re: Remote Control - Any Idea?
User-Agent: Turnpike/6.02-U (<7r9OMDU2ooRJCQmjnYJxyjtHfm>)
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Date: Mon, 4 Nov 2002 10:06:20 +0000
NNTP-Posting-Date: Mon, 04 Nov 2002 10:06:22 GMT
Organization: ntl News Service
In message , Mike
>On 04 Nov 2002, Keith Wootten said:
>> In message , _Jung
>>>I was wondering if there can be any way I can individually control
>>>each VCR with a remote.
>> Glue a cardboard tube - eg a fax roll inner - onto your remote control
>> to restrict the IR beam. Make appropriate noises as you point and
>> shoot; "Rewind or die, VCR scum".
>Or use a lens to collimate the beam.
Not so good, really, you don't want to concentrate the beam so much as
mask it from where it's not wanted. The IR receiver chips will have
AGC, and the unwanted receivers are more likely to find a signal from a
reflected concentrated beam than from a reflected power-reduced masked
beam. The wanted receiver, of course, sees the IR LED line-of-sight
through the tube.
A tube's a lot easier too.
I have actually done this, although with only four IR receivers (and not
on VCRs). They have a wide AGC range, and ambient lighting will affect
their apparent sensitivity. I painted the tube matt black inside on a
whim, but I don't know how necessary that was.