From: jvannes@vms.macc.wisc.edu
Subject: Re: Long distance IR detection
Organization:  University of Wisconsin Academic Computing Center
Distribution:  na
Lines: 13

In article <1993Apr24.064907.22281@ennews.eas.asu.edu>, gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan) writes...

>I designed and built hardware in 1988 that would output a logic level (from
>a 567 tone detector) upon detecting a 500 microwatt LED 28 feet away.
>Used a Motorola MRD360, biased linearly  in a DC-feedback loop to servo out
>variations in sunlight (and 60Hz from lights). Used no lenses.
> 
>Allen Sullivan

I would be interested in knowing more about the sensing hardware.  What did
you use for the detector?  Could you detect the angle of location, or did
the system simply respond to the presence of the transmitter in the sensors
field of view?