Dave, you mentioned having mounted the IR LED and the detector in separate
copper tubes. Does that mean you were using a photo diode? I am using a 3
pin detector, the one that responds to 38KHz modulated IR. It would be
cumbersome to put the module in a tube.

Can one get away with non-modulated IR for this task, using a photo diode in
place of  a 3 pin module?

Regards,

Anand

----- Original Message -----
From: "Dave VanHorn" <dvanhorn@CEDAR.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, May 06, 2003 10:15 PM
Subject: Re: [OT]: Reflected IR problem


> >
> >I'm still wondering how the commercial units manage this (as in the
> >automatic faucets and flushes) using just one window.
>
> I told you how I managed it in a commercial unit.
> 30,000+ of these in the field, with no sensor problems, now that we've
> purged the IR-translucent "white" plastic!
>
> --
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>

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