Alt-BEAM Archive
Message #00212
To: beam@corp.sgi.com
From: Evan Dudzik evandude@yahoo.com
Date: Fri, 5 Feb 1999 17:23:32 -0800 (PST)
Subject: [alt-beam] New "walker" bot idea...
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OK...
Picture a shoebox, with arms like turbot at the very front, protruding from the sides. only not at angles, parallel to the box. when the arms swing around, it will lift up the front end of the box and drag the whole thing forward, setting it down, and the arms come around again.
Can anyone understand my explanation???
How about with 4 legs, 2 on the front, 2 on the back, so it lifts the whole thing instead of dragging the back? and to turn, move either one side at a time for slow turning, or both sides in opposite directions for a faster turn. Kool??? Well???
also check out Mark Tilden's WALKMAN!
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Attachment: walkman2cool.jpg
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213 Fri, 05 Feb 1999 20:15:18 -0800 [alt-beam] Re: Button Cell batteries. Jean auBois Bob Shannon Jean auBois wrote:
>
> At 10:58 PM -0700 2/4/99, Bob Shannon wrote:
>
> :Button cells can be had with 500 maH capacities, but their designed
> :discharge rate is very low, much lower than the demands of a walker
> :or even photovore.
>
> This brings up an interesting question. Do these cells (a) have a
> decent voltage curve when the discharge rate is within specs and (b)
> have enough voltage to run a solar engine? If so, you could make a
> "photo"popper with them that runs on a battery. Unfortunately, since the
> cell would be in parallel to the capacitor there would be a low-impedance
> path when the engine fired but perhaps that wouldn't be a problem.
You need to place a series resistor between the cap and battery or the
photovore will latch-up.
Within specs, their voltage curve is nearly flat for months, then slops
off rather sharply towards dead.
This discharge rate does not accomodate driving a SE directly, unless
there is a series resistor like I mentioned above. Given a high enough
resistor value to limit the peak battery discharge current to less than
5 ma will do a fairly decent job of getting most of the juice out of the
battery.
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