Why you don=B4t use a phototransistor instead of a LDR?
Could you explain your application?
Pablo
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> Date: Thu, 31 May 2007 19:19:49 +0200> From: ostentativ@arcor.de> To: pic=
list@mit.edu> Subject: [PIC] pro and contra: reset switch> > I created a co=
ntactless reset switch for the 16F628A. It consists of> two(to compensate f=
or different light situations) Light Dependent> Resistors (and two resistor=
s to create a reference) and a comparator> to compare both.> > Another opti=
on is a pushbutton and no LDR.> > I ask you, dear reader, about your pros a=
nd cons regarding one option> compared with the other one.> > My applicatio=
n is to work in a relatively dark environment and a light> one.> > As a sta=
rting point, my pros:> > LDR Pro:> > - classy> > - no contact (compared wit=
h the switch), so no abrasion.> > - using is effortless> > - fast change of=
 states(only depending on your hand's speed)> > > Pushbutton Pro:> > - Havi=
ng used a LDR often, it might not have the same value as the one> being use=
d as a reference. So light and dark changings cause a value> change when be=
ing exposed to the same light intensity.> > - Secure under any circumstance=
s, push means contact, release means> none.> > - Lasts Millions of pushes a=
nd releases.> > - I can always be sure about its state. Either the cylinder=
 is inside> or not.> > Regards> > TK.> > -- > http://www.piclist.com PIC/SX=
 FAQ & list archive> View/change your membership options at> http://mailman=
.mit.edu/mailman/listinfo/piclist
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