Alt-BEAM Archive
Message #12411
To: beam@sgiblab.sgi.com
From: Dave Hrynkiw dave@solarbotics.com
Date: Thu, 23 Mar 2000 19:08:36 -0700
Subject: [alt-beam] We own Wilf!
.... Well, not really (but would like to!).
But Solarbotics _is_ sponsoring his attendance and lecture to the BEAM/WCRG
Millennium Robot Games (http://www.robotgames.com).
Just another reason to come out to the event this summer!
Regards,
Dave
---------------------------------------------------------------
"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
2 vowels. Pronounciation? _SMITH_".
http://www.solarbotics.com
12412 Thu, 23 Mar 2000 20:28:18 EST [alt-beam] Re: Cricket beam@sgiblab.sgi.com BUDSCOTT@aol.com thats really interesting, maybe we should incorperate that in our bots to
prevent them from getting heat damage!
-Spencer
12413 Thu, 23 Mar 2000 20:15:33 -0500 [alt-beam] Re: Logic puzzle - I need to built a new gate... :-) beam@sgiblab.sgi.com Richard Weait Hey, Justin, you've been busy!
At 10:03 AM 3/24/00 +1200, Justin wrote:
>Hiya,
>For the turning system of a walker I'm designing, I ran into an engaging
>logic problem that I thought I'd share will you (mainly in the hope that
>someone could solve it in a more elegant manner than I have :-).
[snip]
Looking at your circuit the two inputs are switches. You show one
tied High and the other tied low; I've elected to treat them as
open (0) or closed (1) in my truth table:
A B | O1 O2
----|------
0 0 | 1 X
1 0 | 1 0
1 1 | 0 0
0 1 | 1 X
Look at O2 (output 2) first. It can be tied to ground permanently.
Output one is a NAND (that is, AND followed by NOT) But really
you just want the xx240 enabled when both switches are active, right?
It's just this easy.
Pull-up resistor from the enable to Vcc (+5V, whatever)
Enable - resistor junction through two switches in simple series to
ground. One component.
xx240
Vcc -------
| |
`--/\/\--o---| /E
| |
| |
o
SW1 /
/ o
|
|
o
SW2 /
/ o
|
|
o
Gnd
Cheers,
Richard.
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