Alt-BEAM Archive
Message #02517
To: beam@corp.sgi.com (mailing list)
From: Benjamin Edward Hitchcock beh01@uow.edu.au
Date: Wed, 21 Apr 1999 07:56:26 +1000 (EST)
Subject: [alt-beam] Re: Photopopper redundancy
Alf does this -
http://wollongong.apana.org.au/~ben/alf
The beauty of the photopopper is that despite having two SE's, the parts
count and physical size still remains small.
If you use the discriminator circuit from alf, then you need a 74HC04 chip
to do the deciding - which makes the whole 'bot a lot larger. Two 1381's
are still smaller than one 74HC14.
I didn't care about the physical size with alf - the circuit just had to
fit inside the car.
PS. My new 'bot is almost ready! It's like nothing you've seen before!
Ben
----- Forwarded message from Nigel Joyce -----
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> With regards to the standard solarbotics photopopper circuit, Isn't there
a
> bit of redundancy there? I mean, all it is 2 SE's that are biased so the
1
> receiving less light fires first right?
>
> Wouldn't it be simpler to have just 1 SE and then have some sort of simple
> circuit to decide which side gets the current. Is there any sort of chip
> that flips a switch depending on which input has a larger/smaller
> resistance?
>
> I am new to this so I still don't understand what is possible and what is
> not possible. I guess it's the programmer in me trying to remove the
> redundancy.
> Blue Skies
> ---Buzz---
>
> I didn't just kiss death, I slipped it the tongue!
>
> nigel.joyce@usa.net
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----- End of forwarded message from Nigel Joyce -----
--
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