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From: bernie@metapro.DIALix.oz.au (Bernd Felsche)
Subject: Re: Need help thermometer to RS232?
Message-ID: <Cy2qMy.MFy@metapro.DIALix.oz.au>
Organization: MetaPro Systems, Perth, Western Australia
References: <Cx2z9w.Hnu@news.cis.umn.edu> <003302Z02101994@anon.penet.fi> <CxA02t.E96@freenet.buffalo.edu> <3881el$ff5@mpcc3.rpms.ac.uk>
Date: Sat, 22 Oct 1994 12:28:10 GMT
Lines: 34

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
