Alt-BEAM Archive

Message #03198



To: Matt Procopation proc@home.com
From: "Jesse D." smokin@n-link.com
Date: Tue, 11 May 1999 12:50:22 -0500
Subject: [alt-beam] Re: Photodiode question


One thing i have found on my bicore head is that the diodes are
sensetive on BOTH sides. this confuses the bot because its recieving
light from both front AND rear. Try shielding the back sides of them
with some black tape..


> >
> > I've got this FLED photovore (from the schematic that's been
> > floating around the mailing list lately) popping around on my
> > desk, and it appears that it's not acting photophilic at all.
> > When I breadboarded the circuit, it seemed to work just fine,
> > but since it's been given a body, it just goes whereever it pleases.
> > At first I thought I might just have the motor leads backwards,
> > and that it might be photophobic, but it doesn't look like it.
> > The only thing that I can think of is that the photodiodes don't
> > have the same face pointing forwards.
> > Looking head on at the bot, they're arranged like-
> >
> > [] []
> > / \ / \
> > a c c a
> > (a=anode, etc)
> >
> > Now, these aren't solarbotics-type photodiodes; they don't
> > have one face that is obviously rounded, they're basically
> > symmetrical rectangular prisms.
> > So, do photodiodes usually have one face that is the most
> > sensitive? If so, I probably just need to flip one of them around.
> >
> > _ _
> > Matt

--
__ __ Jesse C. Druehl __ __
/ `-' / ,,, AKA (Smoke) ,,, \ `-' \
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