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From: Donald.Heller@jpl.nasa.gov (Don Heller)
Subject: Re: Need help thermometer to RS232?
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References: <Cx2z9w.Hnu@news.cis.umn.edu> <003302Z02101994@anon.penet.fi> <CxA02t.E96@freenet.buffalo.edu> <3881el$ff5@mpcc3.rpms.ac.uk> <Cy2qMy.MFy@metapro.DIALix.oz.au>
Date: Mon, 24 Oct 1994 16:47:27 GMT

In article <Cy2qMy.MFy@metapro.DIALix.oz.au> bernie@metapro.DIALix.oz.au (Bernd Felsche) writes:

>In <3881el$ff5@mpcc3.rpms.ac.uk> Keith Dowsett <kdowsett@rpms.ac.uk> writes:

>>In article <003302Z02101994@anon.penet.fi>,  <an136163@anon.penet.fi> wrote:
>> >Hi,
>> >   I am interested in constructing an electronic thermometer which will
>>>interface to a PC.  I would like to use the PC to record temperatures over a
>>>period of time.  The interface must use an RS232.  Anyone done this before?
>>>Are there any magazines that have featured a project such as this?  Any help
>>>would be GREATLY appreciated!

>Options:
> 1.     Digital multimeter with RS232 interface & temperature probe
>        (~US150??)

> 2.     Roll your own. Start with el-cheapo temp-probe (<$20), hook
>        up an A/D converter and have that scanned using a "uart" (note
>        "" marks!). You can set up a simple clock circuit which runs
>        through the data bits repeatedly, with necessary RS232 frame
>        stuff glued into the cycle.

>        Just send the data in binary. (It would be easier if you
>        could hook up a parallel port.)

> 3.     Start with 68HC11 variant with A/D and RS232 and temp probe.
>        Start programming!

>Options 2 and 3 are eaually as complex to implement (IMHO) just do
>whichever you like the most, and fits your budget!

>-- 
>Bernd Felsche, MetaPro Systems Pty Ltd
>328 Albany Highway, Victoria Park, Western Australia
>Phone: +61 9 362 9355  Fax: +61 9 472 3337

For $39, you can get a BASIC Stamp from Parallax.  Their ads in Circuit Cellar,
INK and other mags show your application as a typical app.  Nuts & Volts also
features this, as well as details to make your own counterfeit Stamp.

Don

Don Heller (Donald.W.Heller@jpl.nasa.gov)
           (heller@vraptor.jpl.nasa.gov)
           (73632.454@compuserve.com)

LASCIATE OGNE SPERANZA, VOI CH'INTRATE

