Alt-BEAM Archive
Message #13824
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter wilf.rigter@powertech.bc.ca
Date: Fri, 21 Apr 2000 22:27:14 -0700
Subject: uSERVO3
<>
Here is another design in a series of beam "unmodified" hobby servo
controllers.
The uSERVO3 uses just one 74HC14 chip to impliment microcore with diodePNC
and two PWM controllers driving the front and rear servos.
The active Nv sets the CW and CCW pulsewidth of the PWM generator to move
the motor back and forth. Between active Nvs, the PWM generator is turned
off which holds the last position. Because of a disturbance in first and
last pulse width in each CW and CCW pulse train, a slight jerkiness results.
I will fix this in the next version.
This is getting closer to an optimal solution and there is still turning
and reversing to be done. I hope this can be added while tossing out a few
more surplus parts.
13825 Fri, 21 Apr 2000 23:05:04 -0400 (EDT) Re: [alt-beam] [OT]Re: 1381's in Australia Jeffrey D Spears >Not only do you folks pet kangaroos all day long, you haven't figured
>out how to make the water swirl in the right direction whilst flushing
>the toilet!
>
>Oh those Ozzies!
>
>BTW--saw two New Years celebrations in Sydney. Ozzies *do* know how to
>celebrate!
>
>ok..jef
>
>On Fri, 21 Apr 2000, David Perry wrote:
>
>> its our right to call you yanks, you make us look like we're all from the
>> 'outback' and that we have pet kangaroos and say g'day constantly :-)
>> Besides, America includes Brazil, Canada, Mexico,......
>> sigh...another useless thread
>>
>> David Perry - US Citizen, NZ Citizen and Australian Citizen
>>
>>
>> ----- Original Message -----
>> From: "SG"
>> To:
>> Sent: Friday, 21 April 2000 10:45
>> Subject: Re: 1381's in Australia
>>
>>
>> > At 08:31 PM 4/20/00 EDT, you wrote:
>> > >
>> > > Yanks....! Hey watch it Ben. Our Civil War wasn't that long ago. Many
>> take
>> > > that as an insult (me maybe). Americans. Not Yanks.
>> >
>> > *sigh* i guess you get offended when we are referred to as "the colonies"
>> >
>> >
>>
>>
>> __________________________________________________
>> Do You Yahoo!?
>> Talk to your friends online with Yahoo! Messenger.
>> http://im.yahoo.com
>>
>
>
>Jeffrey D. Spears
>University of Michigan
>College of Engineering
>
>``Double-E, can't spell gEEk without it!''
> -Captain Gerald M. Bloomfield II, USMC
> (my brother)
>
>
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13826 Sat, 22 Apr 2000 09:55:17 -0400 Re: [alt-beam] Re: efficient launcher? alt-beam@egroups.com "R. Martin Keen" I was looking through www.scitoys.com. They have plans for a hydrogen
powered water squirter that fits the below description. I went through
some of the other pages at the site, and found plans for a device that
launches a film canister about 20 feet. It can of the canister is
mounted on a board. There's a spark gap mounted through the cap. It
goes to a scripto electric lighter element. To make it go bang, you fill
the canister with perfume, then press the piezo lighter. BANG! Only one
problem. Its kind of a one time use thing for robots. Reloading the
perfume would be easy for a solenoid, but getting the film canister back
onto the cap take too much accuracy for an automatic robot. Might be
good for that wall climbing competition....
Martin
My 2 cents (3 cents Canadian)
On Wed, 19 Apr 2000 23:23:02 -0500 (CDT) "Jonathan B. Cage"
writes:
> Interesting. Btw, I love potato guns. Although I'm a total BEAM
> newbie
> (saw it a couple weeks ago and am just ordering stuff for my first
> photovore), I was thinking about some sort of combustion mechanism
> like
> this. What I was thinking involves a couple
> small carbon rods (from old batteries) and water. If you connect a
> carbon
> rod to both the positive and negative terminal (so one rod per
> terminal)
> of a battery and submerge them in water, the currect will actually
> separate the hydrogen and oxygen in the water. Then you could
> ignite it with a spark from some piezo element. However this
> process is
> extremely slow. I know a 9V battery can separate enough hydrogen to
> create quite a little explosion in a 1 inch square container in
> about 20
> minutes. This probably isn't very practical for solar powered
> applications, but it maybe could be used as an emergency escape
> mechanism
> or weapon by a bot. Sort of along the same lines as insects employ
> chemical defense weapons.
>
> My 2cents
> -Jonathan
>
> On Wed, 19 Apr 2000 Meabadboy@aol.com wrote:
>
> > In a message dated 4/19/2000 12:57:52 PM Eastern Daylight Time,
> > phillip@ryals.com writes:
> >
> > << But what about a launcher? I
> > really don't think there's an efficient way to do it with a
> solenoid or
> > motor... >>
> >
> >
> > Have you thought of something along the lines of the old "Potato
> gun" idea ??
> >
> > you could use a combustion chamber that is fueled by a main tank
> and ignited
> > by a charge ~ something like a starter on a gas grill.
> >
> > (see attached sketch)
> >
> > You could fill a small chamber with a modest amount of fluid ~
> like lighter
> > fluid ~ from a main tank ~ the grapple could be pulled into place
> by the
> > winch and mechanically slid into the chamber ~ then launched ~ and
> then
> > retrieved by the winch ~ to be launched again and again until the
> fuel supply
> > is gone ~ but that too could be refueled by the bot by when it
> indicates a
> > low level it could return to a fueling station.
> >
> > Just a thought
> >
> > Steve
> >
>
>
>
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13827 Sat, 22 Apr 2000 10:46:26 -0700 (PDT) Re: silence 'bot beam@sgiblab.sgi.com Daniel Grace I don't know how difficult it will be, as others have
suggested, but in the matter of fairness I will give
you an answer. Look up common-emmiter amplifiers. It's
an amplifier where the output is on the collector. You
need two biasing resistors, a load resistor, a
stabilizing resistor, and a degeneration capacitor, as
well as (probably) two isolating capacitors, and of
cource, the transistor. I have no idea how much of an
amplification you'll need, and I suspect it will also
depend on the microphone. I don't even know if this
will work. Some people seem to suggest that it won't.
However, it does at least provide a 180 degree shift,
and that's a start.
~Daniel
--- William Cox wrote:
> Hey all,
> I been thinking about noise cancellation. This
> might be an interesting
> application for a robot. Silence where ever he goes.
> The whole principle is
> that a sound wave is read inverted and piped back
> out to give silence. What
> circuitry would I use to do this? I don't think a
> regular inverter would
> work right, 'cause it only trigger at a certain
> point. How do I get full
> inversion?
> -William
>
> ____________________________
> http://www.botic.com/users/robotcentral
> Soon to be a www.GoRobotics.net!
> Robotics books, projects, resources,
> links, news, and more!
>
>
=====
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13828 Sat, 22 Apr 2000 13:00:00 PDT Saturday Chat!!! alt-beam@egroups.com "Jonathan Smolders"
I always miss the sunday chats...or any chats for that matter. So I decided
to host a chat...at the yahoo club of course. Oh, lets say...7:00 P.M.
Pacific Daylight Time. (that means 7:00 P.M. on the west coast of Canada).
See you there :-)
Jonathan
http://members.xoom.com/beamrobots/
(just created this...it should be up by tonight)
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