G'day Bill,



30 Nov 96 07:28, Bill Grimsley wrote to Rod Gasson:



 RG>> What *I* use is the IR reciever from the old Akai VCR's (VS2

 RG>> etc). These units can easily be detached from the machine and

 RG>> powered by a 9v battery...  the LED will on these light up

 RG>> with *any* IR.



 BG> Somewhat similar to what I'm using here, except mine is a clear IR

 BG> LED wired to the CRO, so I can physically see the PCM from remote

 BG> transmitters.



Sounds good, but in all my years of servicing I can't recall a single

time where I've needed to see the PCM - In my experience IR RC's

either Xmit the correct data or they don't xmit at all..   generally

speaking that is.



 BG>  However, this is NOT the application my friend has in

 BG> mind, but I really can't be any more specific than that, as I believe

 BG> that what he has in mind is possibly bordering on illegal.



If I supply the solution, will he guarantee me 50% of his takings? 



 BG> Imagine this hypothetical set of circumstances - you are in a dark

 BG> room, no ambient light whatsoever, and there are several IR beams

 BG> which will activate an alarm system when interrupted.  What would YOU

 BG> use to detect these beams?



HHHhmmm...  detecting the *beams* could prove difficult... However, as

mentioned in other messages, a videocamera is the easiest way I can

think of to detect the *source* of IR.



Incidently, if he wants this to avoid or bypass IR security systems

then he's not gunna have much luck, 'cos the passive IR sensors that

are most commonly used are exactly that. Passive!.  They don't *emit*

IR, they sense it.



Cheers,

Rod



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