Alt-BEAM Archive
Message #12947
To: beam@sgiblab.sgi.com
From: SkavenArmy@cs.com
Date: Mon, 3 Apr 2000 01:41:58 EDT
Subject: Re: Conductive Epoxy?
you mighttry silicone putty , it really gets into the cracks ood , and it
bounces!
12948 Mon, 03 Apr 2000 15:57:09 +1000 Re: Ideas..... ~ 4 position sensor Meabadboy@aol.com, beam@corp.sgi.com Jacob Booth At 03:39 PM 4/2/00 +1000, you wrote:
>
>
>In a message dated 4/1/2000 3:44:38 PM Eastern Standard Time,
>sebastiaan_van_v@hotmail.com writes:
>
><< Go to a cheap shop and buy yourself a nice kitchen timer >>
>
>hey thanks for the idea ~ ill give that a try also..........
>
>But Im building this for a position sensor (see the attached photo)
>
>have you seen the movie "THE ROCK" with Sean Connery? ~ the scene in the
>shower room where there is a litttle tumbler motion sensor? ~ the movie
>shows
>2 or 3 good close ups of it.
>
>anyway ~ I had an idea of taking a small scrap of printed circuit bord and
>drilling a 5/8" hole in the center ~ I layed out a set of pads and a
>contacts
>for each pad and etched it before drilling ~ (see the pic attached) ~ the
>pic
>has only 4 positions ~ and right now that will do for my application ~ but
>i
>can for see as many different positions you want to make ~ I drilled the
>hole
>in the bord and then took a piece of bare copper wire and wrapped it around
>a
>5/8" rod to make it round to fit just into the hole ~ i cut the wire and
>then
>forced it into the hole and sodered it into place ~ i then took the dremil
>and cut the sodered wire at each seperation ~ this gave me 4 seperated
>contacts ~ i made a smaller bord and in the center took a small eye and
>screwed it into the center and sodered a wire on the opposite side ~ i
>fassioned a small rod with a eye on one end out of a papreclip and affixed
>it
>to the eye in the bord ~ at the other end of the rod i glued a small
>fishing
>weight to the paper clip ~ i took standoffs and mounted the small board
>above
>the other board and as you can see in the picture attached I now have a
>position sensor ~ 4 axis
>
>Steve
Try this one:
http://www.oatleyelectronics.com/switches.html
and look for:
TILT SWITCHES: loose ball type, see articles in EA May 93 and SC Jan 95 for
info on how to use: (TS1) $1.50
You need not worry about seeing the articles on how to use it... the metal
can and the centre pin are the 'main' pole of the switch, and the ring of
(8 or 10 - I can't remember how many) are the tilt position connectors.
Inside the can is a small dimpled metal ball that makes the connections. I
have 2 of these at home I have been playing with. Quite nifty, and very
small (just a bit larger than say.. an M&M plain variety :)
Cheap, ready made, reliable, sealed, plenty of 'tilt' positions, and cheap
:). That $1.50 is Aus dollars... about $1 US...
------------------------------------------------------------------
Jacob Booth BIS, MCP Web http://www.its.mary.acu.edu.au/
IT Services Email j.booth@mary.acu.edu.au
Phone (02) 97392235 Fax (02) 97392924
Australian Catholic University - MSM Campus Strathfield NSW
"Your lack of planning does not make it an emergency on my part"
12949 Mon, 3 Apr 2000 09:27:40 +0200 RE: PM-1 "Thomas Pilgaard" I've tested the PM-1 on an ant cirquit with two pagers with these caps:
a) one 4700uF cap
b) two 4700uF caps in parallel
c) a 1F goldcap.
As for a) and b) I could hardly get the ant to run. And for the 1F cap I
can't tell as I still need a 1381C to go with the 1F cap. However, When the
1F cap had fully charged I put it directly on the leads of a pager motor and
it would run for a good 60 seconds!
Don't know if it'll help you much but it seems we are doing the same with
the ant and the PM-1 (glad to share it with someone :)
- Thomas
> I've looked at what the recommended cap ratings for the PM-1 are,
> 3000uF to
> 10F (oh man, thats a friggin battery!). but, what kind of time
> would you get
> off of two 4700uFs, 10000uF, 1F, also, what is the charge time
> like under a
> 5.5v 23 mA cell (the big suncerams)? Thanks, i'll let ya know how
> it turns
> out!
>
> -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?)
>
Home