Alt-BEAM Archive
Message #04305
To: beam@sgiblab.sgi.com
From: Wouter Brok w.j.m.brok@stud.tue.nl
Date: Sun, 06 Jun 1999 14:20:59 +0200
Subject: [alt-beam] Re: Bicore, wasting energy
Hello Evaristo and the list,
This weekend I thought a bit more about the problem and I came up with a
circuit, which is quite component-efficient. Unfortunately I don't have
acces to the advanced computer facilities of this university on Sunday, so
you'll have to wait till tomorrow for a scanned drawing of the schematic.
It is a three-state circuit (left - stop - right) and the motor can be
driven with a PWN-signal to change the velocity. It hasn't been tested yet
and it won't be before tomorrow since I don't have my equipment today.
It contains: 2 inverter in the bicore,
2 (or maybe 3) extra inverters for the 'interface'-circuit
1 comparator
some resistors, capacitors and stuff.
the inverters are all contained in one 74HC240, and maybe (I'm not sure)
the comparator can be created using an inverter in a Wilf-schematic I
remember from some time ago ... think it was called something like
'high-pass variable threshold detector'.
More tomorrow.
Wouter Brok.
>Hmmm, a lot of components. It would be easy if you don't use a bicore. You
>could simply put the two photo diodes in series with the power supply. The
>voltage coming from the photo diodes will vary between Vcc and ground. Feed
>this to a "window" comparator (2 op-amps) and you're ready. The outputs
>from the op-amps will indicate: left, equal or right. Just thinking. What
>if the voltage is sampled between the photo diodes in the bicore. Hmmm I
>should measure it to know how it looks. It will probably be a charge
>curve..... Have to look at it some more.
>
>See'ya
>
>
>Evaristo
>
>Gizmo homepage: http://www.crosswinds.net/~evaristo
>
>
>
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