Alt-BEAM Archive
Message #02730
To: "BEAM Mailing List" beam@corp.sgi.com
From: "Nicholas Smith" nik@resourcekt.co.uk
Date: Wed, 28 Apr 1999 16:13:54 +0100
Subject: [alt-beam] Re: FLED Photopopper Question
>Hey everyone,
>Sorry to annoy you with another debug question
>but here goes. I breadboarded up a FLED photopopper circuit
>using the design supplied by Nik
Okay, first things first. Remove the photodiodes and switches. You should
now have two FLED solarengines connected to on cap/solarcell. If it stil
doesn't work then try disconnecting one of the solar engines (We'll just
debug one for now). How about now?
if so connect the other solar engine and play arround woth the cap/resistor
values until the photodiodes work.
>Because I used new matched components, I didn't
>see the need to use a trimpot between the photodiodes
>and gnd.
You may still need the trimpot. No components are 100% matched and your
robot may need tweaking.
>measured
>the voltage across the FLED go up to 2.45v and the
>voltage across the photodiode go to 0.7v
Ahh, sounds like you have your FLED in the wrong way around. Try turning it
180degs
Hope this helps and don't worry we've all sat around for 15mins in hope that
sooner or later out photopopper is going to pop. :-)
Adios
Nik.
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