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PICList Thread
'Button Cell ID tags'
1995\03\30@044846 by Monty H. Brekke

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In message <spam_OUTm0ruGcw-000DCnCTakeThisOuTspamdopey.me.iastate.edu>, you write:
>This may be PIC related...
>
>I went to the MegaZone in Morecambe last night, it is a laser gun game
>arena, like QZar and Laser Quest.  Normally you are known as 'Player 1'
>etc., but if you purchase club membership you get your own name stored on
>the computer to identify you.  To activate this feature you are given a tag
>which looks exactly like a button cell (or lithium battery).  You press the
>cell against two contacts (centre and edge, like + and - contacts for a
>power cell) and somehow the cell returns a unique code.  One of the cells
>was manufactured by Dallas.  How do they work?
>

The Dallas part is probably one of their "Silicon Serial Numbers" (basically a
serial ROM), which uses Dallas' one-wire bus. This is a novel bus which uses a
single wire for power, clock and data. Interesting devices, these. While we're
on the subject, does anyone have PIC code for talking to this bus? The
protocol looks to be a bit on the complicated side. :-)

                                                       --Monty

===============================================================================
.....mhbrekkeKILLspamspam@spam@iastate.edu            | "You don't have to thank me. I'm just trying
brekkespamKILLspamdopey.me.iastate.edu     | to avoid getting a real job."
                               |                               --Dave Barry


'Button Cell ID tags'
1995\04\01@224728 by Andrew Warren
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Monty W. Brekke (.....brekkeKILLspamspam.....dopey.me.iastate.edu) wrote:

>The Dallas part is probably one of their "Silicon Serial Numbers"
> ....
>does anyone have PIC code for talking to this bus? The protocol looks
>to be a bit on the complicated side. :-)

Monty:

It's not complicated at all, although you probably want your PIC to be
running at some real clock speed (like 4 MHz -- I've done it at 32 KHz,
but it wasn't fun).  You should get a copy of the Touch Memory Databook
from Dallas if you're interested in these parts.

-Andy


--
Andrew Warren - EraseMEfastfwdspam_OUTspamTakeThisOuTix.netcom.com
Fast Forward Engineering, Vista, California

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