I button

Archiver

I also would like to see a method of reading the 1 wire buttons. I have
heard as well the stamp is to slow. Cant a simple ckt be built to send the 2
quick pulses the 1 wire needs,and then read in the data from the 1 wire
using a stamp? I wanted to red the 1 wire weather station with a stamp.
Sincerely
Kerry
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Archiver

Have any of you successfully interface an I button with a stamp? I know the
BS2P40 has a one wire connection.



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Dallas/Maxim iButton interfacing is very simple with the BS2p family. The
BS2p demo boards even have iButton sockets on them. That said, Dallas specs
are sometimes difficult to deal with. We've taken care of the protocol
stuff, the rest is up to you.

Are you having a specific problem?

-- Jon Williams
-- Parallax


In a message dated 2/9/2003 9:15:46 AM Central Standard Time,
Trkeenan@a... writes:

> Have any of you successfully interface an I button with a stamp? I know the
>
> BS2P40 has a one wire connection.



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

No Problem yet. I didn't know if it was something I thought I could figure
out easily.

Tim


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Hi:

As you mentioned, the BS2P40 has 1-Wire capability built in. Adding that
capability to a BS2 requires adding hardware. Two options:

1) Use the Dallas 8 pin surface mount DS2480b intended to help PCs cope with
the precision demanded by 1-Wire processing. See:

http://pdfserv.maxim-ic.com/arpdf/DS2480B.pdf

the flow chart is on page 4.

2) Use an 8 pin DIP co-processor complete with almost 30 example programs
already written for the BS2 and covering these 1-Wire / iButton devices:

iButton DS1971 EEPROM Memory
iButton DS1992-4, 4k Memory, Real-Time clock, Counters
iButton DS1996 64k Memory
DS182x Family of Temperature sensors
DS2401 Presence detector
DS2405/6 PIO devices
DS2422/3 RAM, Counters
DS2430 EEPROM Memory
S2890 Digital Potentiometers

When told to search it also stores up to 8 of the 64 bit IDs in its own
EEPROM. Then reference as #0-7 rather than feed 64 bits for each operation.
Full info here:
http://www.rhombus-tek.com/OneWire.htm also as .../OW.pdf

Whether BS2P40 or either of the above
www.maxim-ic.com will help with 1-Wire device samples.

David H. Lawrence

For Rhombus

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Original Message

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From: <Trkeenan@a...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, February 09, 2003 7:13 AM
Subject: [noparse][[/noparse]basicstamps] I button


> Have any of you successfully interface an I button with a stamp? I know
the
> BS2P40 has a one wire connection.
>
>
>
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