Alt-BEAM Archive
Message #11439
To: beam@sgiblab.sgi.com
From: Steven Dang az-anuxm1@usa.net
Date: 7 Mar 00 11:40:27 CST
Subject: [alt-beam] Re: nv's and nu's
Thank you very much, for respnce was very helpful for me.
Steven
Bruce Robinson wrote:
> Steven Dang wrote:
> > =
> > I'm trying to figure out the difference in the schematics for a
> > neuron in a nervous net and a neuron in a neural net...
> =
> Hi, Steve. Just happen to have (see attached) ...
> =
> > ... I know the differences in their purposes. A neural net is the bra=
in
> > that carries out thoughts, and the nervous net is the spinal cord
> > that controls sensory and motor functions...
> =
> It's not that clear cut, I'm afraid. They are both useful in both
> functions.
> =
> The basic Nv neuron responds to a rising input by switching it's
> normally high output to a low one for a varying amount of time. Given a=
n
> input that goes from high to low to high again, on the low-to-high
> transition, the output will go from high to low. After a delay
> (determined by the resistor and capacitor values), the output will
> switch back to high. This allows you to chain Nv neurons together and
> have a signal travel slowly along the chain.
> =
> The basic Nu neuron responds to a prolonged change in input. If a high
> signal is applied to the input, after a delay, the output will switch
> from high to low and will remain low as long as the input stays high.
> =
> One essential difference is that the Nv responds immediately to an
> input, and sends the output for a time duration: The delay occurs AFTER=
> the output is sent. The Nu responds to an input after a delay and sends=
> the output continuously. The delay occurs BEFORE the output is sent.
> =
> > ... But i don't know what the schematic of each of these are. Could
> > someone clarify this for me.
> =
> See attached. The only difference between the two is that the capacitor=
> and resistor are swapped. Each one also has a variation where the
> resistor (Nv) or capacitor (Nu) is connected to Vcc instead of ground.
> =
> I'll be interested to hear what the rest of the BEAM community has to
> say about this (I'm taking notes ... watch for a future web page). Also=
,
> any critique of the diagrams will be appreciated.
> =
> Bruce
> --------------------------------------------- =
> Attachment:=A0anr_x_20-1_nv.gif =
> MIME Type:=A0image/gif =
> --------------------------------------------- =
> --------------------------------------------- =
> Attachment:=A0anr_x_24-1_nu.gif =
> MIME Type:=A0image/gif =
> --------------------------------------------- =
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11440 Tue, 07 Mar 2000 09:50:41 -0800 [alt-beam] Re: Was lobster, now bees beam@sgiblab.sgi.com Bruce Robinson John Bachman wrote:
>
> ... If one of the bot functions is to find food and it succeeds, is
> it not inconcievable for it to communicate the location to other
> bots? Once a frame of reference is established (no trivial task)
> then instructions appropriate to the bots movement mechanisms could
> be communicated from one to another.
This is certainly in reach of the BEAM community. Richard Caudle's HPV
idea can be adapted to this purpose. Sound is the communications medium
... the robot that finds food sends out a periodic "chirp" and the
robots that hear the chirp turn towards the sound.
The circuits to detect and create the sounds exist (thanks to Wilf). All
that's needed is to define "find food" (in robot terms) and adapt the
sound circuits.
Bruce
11441 Tue, 7 Mar 2000 11:45:35 -0600 RE: MicroCore vs. BiCore 'beam@sgiblab.sgi.com' Wilf Rigter [mailto:Wilf.Rigter@powertech.bc.ca]
If damn PNCs are you only concern, you can add 2 diodes to any microcore to
make it PNCless.
The (recycled) PNCFREE microcore starts instantly and is always on alert to
automatically neutralize saturation.
Also note the simplified LED circuit: Since only one LED is on at one time,
the 4 LEDs can share one resistor.
wilf
<>
> -----Original Message-----
> From: David Perry [SMTP:davidperry@geocities.com]
> Sent: Monday, March 06, 2000 9:01 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: MicroCore vs. BiCore
>
> my favourite reason for the bicore is you don't need no damn PNC! Sure its
> fun to play with a microcore, but it always mess up the circuit when i
> bump
> the resistors.
>
> David
>
11442 Tue, 7 Mar 2000 09:52:59 -0800 Quick-Change components beam@sgiblab.sgi.com Phillip A. Ryals [mailto:Phillip@ryals.com]
Looking at some of the close-ups of people's PCB's, I've seen quite a few
small sockets that they're using to plug the resistors into. I figure it
must be to ease changing the timings in the circuit, and I think this is a
superb idea.
So what kind of sockets do they use? I've been scouring for a source, but
haven't found anything good yet. I've broken apart IC sockets, serial
connectors, etc.. but no success. Anyone know what I'm talking about?
thanks,
-phillip
11443 Tue, 07 Mar 2000 10:06:49 -0800 [alt-beam] Re: Quick-Change components beam@sgiblab.sgi.com Bruce Robinson "Phillip A. Ryals" wrote:
>
> ... I've seen quite a few small sockets that they're using to plug
> the resistors into.
I have some salvaged sockets in a long strip of plastic, which may be
what you've been seeing. They're called "Machine Tooled" sockets and
they don't rely on the plastic housing in order to function. This means
you can remove them (very easy to do) and use them independently. I
can't find them in strips commercially, but Jameco has "Machine Tooled
IC" sockets which are essentially the same thing in a different
configuration; I'm sure most other suppliers will have them as well.
I've experimented with these a bit and I discovered that they work best
with devices that have square or rectangular pins (e.g., IC chips). When
you're dealing with round wire leads, the diameter of the wire will
determine how well the socket grips.
I find many of my resistors get vibrated loose from machine tool
sockets, so I've stolen one of Chiu's ideas ... use a conventional IC
socket and bend the resistor leads around to suit the socket spacing.
Some (but not all) IC sockets will give a secure grip to many different
wire diameters.
Bruce
11444 Tue, 07 Mar 2000 20:26:01 +0200 [alt-beam] Re: Was lobster, now bees beam@sgiblab.sgi.com Adi Shavit Hi,
I've been lurking in the mailing list for a while, and I was wondering,
has anyone tried combining swarm intelligence algorithms with BEAM robotics?
The last issue of Scientific American had a nice introductory article about
it.
Adi
Bruce Robinson wrote:
> John Bachman wrote:
> >
> > ... If one of the bot functions is to find food and it succeeds, is
> > it not inconcievable for it to communicate the location to other
> > bots? Once a frame of reference is established (no trivial task)
> > then instructions appropriate to the bots movement mechanisms could
> > be communicated from one to another.
>
> This is certainly in reach of the BEAM community. Richard Caudle's HPV
> idea can be adapted to this purpose. Sound is the communications medium
> ... the robot that finds food sends out a periodic "chirp" and the
> robots that hear the chirp turn towards the sound.
>
> The circuits to detect and create the sounds exist (thanks to Wilf). All
> that's needed is to define "find food" (in robot terms) and adapt the
> sound circuits.
>
> Bruce
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