Newsgroups: comp.robotics
Path: brunix!sgiblab!spool.mu.edu!howland.reston.ans.net!pipex!uknet!festival!aifh!ulrich
From: ulrich@aifh.ed.ac.uk (Ulrich Nehmzow)
Subject: Re: LDR info wanted
Message-ID: <1993Oct19.091734.13800@aifh.ed.ac.uk>
Keywords: sensitivity, specs
Reply-To: ulrich@aisb.ed.ac.uk (Ulrich Nehmzow)
Organization: Dept. of Psychology (Robotics), Edinburgh University
References: <CF4Bru.617@acsu.buffalo.edu>
Date: Tue, 19 Oct 93 09:17:34 GMT
Lines: 19

In article <CF4Bru.617@acsu.buffalo.edu> lammens@acsu.buffalo.edu (Joe Lammens) writes:

>1) what is the approximate spectral sensitivity of an LDR (light dependent
>resistor, mostly CdS cells I believe)
>
>2) what the listed resistance in a catalog might refer to: minimum (in
>bright light), maximum (in darkness), or something else?
>

I have data here for a cadmium sulphide LDR (price ca. 1 pound), which
has a peak spectral response at 550nm, and a resistance of 20 to 100
kOhm at 10 Lux, 5kOhm at 100 Lux and 20MOhm in darkness.

Ulrich.
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