Alt-BEAM Archive
Message #10557
To: beam@sgiblab.sgi.com
From: "Sathe Dilip" sathe_dilip@bah.com
Date: Sun, 20 Feb 2000 22:40:00 -0500
Subject: [alt-beam] Re: walker - a bit better
What type of lithium batteries are these? I mean could you describe the
size? To me it looks like the batteries are not good enough in some
way. If these are the coin cells, the mAH would not be sufficient for a
walker. Simple Lithiums (Lithium-Iodide chemistry?) are not good for
high rates of discharges. They can give long shelf life and long slow
discharges. Lithium ion batteries are different - the ones used in
laptops etc.
Try replacing with alkalines & see.
Dilip
----------------------------------------------------------------
Mike Kulesza wrote:
>
> Thanks for the help, especially Wilf.
>
> So I removed the 7805, and put a 100 and .1 uF filter across power rails.
> Also i put a .1 across each motor, and 1 for both h-bridges. Anyway, the bot
> walks about a meter, before the LEDs start glowing less bright, and the
> motors also slow down. Eventually the LEDs start flickering and go out
> altogether. The motors also stop. If I power off, and then on again, the bot
> takes a step and dies. But after about a 10 minute wait, its fine, but dies
> again after about a metre. Im suspecting battery trouble. They're 2 no name
> generic lithium batteries, each 3V, put in parallel for 6V total. What do
> you think?
> ______________________________________________________
>
10558 Sun, 20 Feb 2000 21:39:24 -0600 [alt-beam] Re: BEAM: Tendency toward miniaturization beam@sgiblab.sgi.com SG Maybe Bruce should post his URL for his Beam Links List. It is pretty up
to date.
(and it has MY bot on it!! heh heh)
-Sparky
At 07:19 PM 2/20/00 -0800, you wrote:
>Hi All,
>
>Just signed onto the list. Yes, it's trure, I'm another example one who saw
>the Smithonian
>article and got hooked. Actually I am still on another (equally weird) list
>of tube audio (DIY)
>types. I'm butting in to say that although you may already know it,there are
>some excellent D to A chips available. Unfortunately they seem to be very
>sensitive to static charges, so they are not in
>the touchie-feely group at all (wear a wrist/ground strap, and use a
>grounded point soldering iron).
>That was my attempt to stick to the topic above. ;-)
>
>As I newbie here, I experienced the same as another who posted the other
>day...Most quoted URL's were dead. Some were pretty old (not a problem),
>many under construction, many blocked "you're not authorized to view this
>site!!??, and some common error #404 sites. Still I managed to collect an
>inch of hard copy for future reference (that's what I do with gems from the
>other list). I have also prepared an order for the Electronic Goldmine.
>Still looking for more detail on walkers, especially mechanical
>and electrical interface details.
>
>Going to shut up now and try to learn something as a "lurker".
>
>Thanks,
>
>Joe
>doodle@teleport.com
>
>----- Original Message -----
>From: Jim Taylor
>To:
>Sent: Saturday, February 19, 2000 4:17 PM
>Subject: Re: BEAM: Tendency toward miniaturization
>
>
>> I don't think it's the spine, as much as a the part that the spine
>connects
>> to the brain with, The lightly colored ribbed part on the back lobe. The
>> Cerebellum or the Brain stem, or both.
>> I think the spine would be considered a digital to analog converter in the
>> robotics world.
> -big snip for brevity-
>
>
Home