Alt-BEAM Archive
Message #12736
To: beam@sgiblab.sgi.com
From: BUDSCOTT@aol.com
Date: Wed, 29 Mar 2000 18:01:27 EST
Subject: [alt-beam] Re: my page
you, uh, forgot the adress, hyperlinks don't work through the list.
-Spencer
<http://www.botic.com/users/beamstop>
not a robot scientist
not a college major
not a grad student
not a professor
not a very organized person
just Spencer (isn't that impressive enough?)
12737 Wed, 29 Mar 2000 18:12:35 EST [alt-beam] Re: my page beam@sgiblab.sgi.com SkavenArmy@cs.com oh , sorry.....
www.geocities.com/jaydzink ifthat doesnt work , ad /index.html to
the end
jayz
ohhizi
12738 Wed, 29 Mar 2000 18:19:42 EST [alt-beam] remote control beam@sgiblab.sgi.com SkavenArmy@cs.com I am looking for a 2channel remote control reciever and xmitter.I soon will
have a bit of money to spend , so please keep an eye open.
jayz
12739 Thu, 30 Mar 2000 11:38:56 +1200 [alt-beam] Re: "Electric nerve" designs beam@corp.sgi.com Justin >The ground trigger differently is used differently but schematically the
>same as the "e" field sensor discussed previously. It has the same probl=
em
>as all unterminated HC inputs, of oscillation and high power consumption.
>Because the input voltage depends on leakage resistance it is unpredicta=
ble
>in it's output state. A better solution is uses a high Mohm value resist=
or
>from the HC input to the +V supply. Depending on the application that ca=
n be
>from 1M to 22M.=20
I tried tying it high with a whopping great resister, but no matter how
high the resistance, it effectively destroyed the ability to detect
things. I didn=92t go as high a 22M though=85
Instead, I=92ve been toying with pulsing a high signal to the input, on
the grounds that the residual charge should keep it more firmly high
between pulses (thus hopefully avoiding the oscillation and power
consumption), but with no resister tied high, that charge will more
easily disappear when the sensor touches something. (It sounds like a
very small capacitor might be of use here).=20
I have to try these things out to find if they=92re worth pursuing - as
someone with better predictive understanding than me, any comments
before I have another go at it would be appreciated :-)
BTW, is there a schematic for a similar "e" field sensor somewhere?
>The 2 transistor
>darlington touch sensor can be replaced with a single 2N7000 mosfet with
>using similar input components as the HC input for protection .
That=92s potentially useful=85
12740 Thu, 30 Mar 2000 09:44:51 +1000 [alt-beam] Re: To those going to the Robot Games... beam@sgiblab.sgi.com Elmo Hi Justin.
I am on it already. I have a digital video camera capable of broadcast
quaility footage on standby for August. I also have a high quaility digital
still camera and lots of practice taking close up photos of electronics. I
do most of the photography here at ILID and it's usually of small features
like the lens photo i sent you all the other day. Plus i will most likely
have another engineering buddy come along. He is the professional
photographer for 4 of Australias most recent Antartic expeditions ( i think
he has spent over 4 years down there now) and has a lot of his photos
published in books and magazines around the world.....plus he's a keen robot
builder himself (just not BEAM stuff). I will also take a dicitophone along
to record interviews and questions about the robots we see. Does that cover
it enough for you?
On another note......
David has the RoboCup CDrom. I might make a few.....*ahem*.....backups of
it. If you would like a copy sent to you then send me your postal address
and i will snail mail a copy to you.
Elmo
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