Re: Thermistor into XP computer excel

From: petrus bitbyter (p.kralt_at_reducespamforchello.nl)
Date: 11/29/04 

Date: Mon, 29 Nov 2004 15:59:27 GMT

"rob" <rcam001@hotmail.com> schreef in bericht
news:930e94cb.0411271317.45ffaa83@posting.google.com...
>I am recording 7 locations for temperatrure with thermistors and a
> digital Multimeter and manually entering into an Excel spread***. I
> would like to automate. I only need to take sample temps once every
> 15 minutes (or so) 12 hours a day.
>
> i saw a site where 2 temps can easily be logged into excel via game
> port, using Visual Basic in XP.....soooo....I figure it shoouldn't be
> a big stretch to do what I want.
>
> Can anyone point me in right direction to build hardware to do
> this?..or if more than moderatly difficult an off the shelf card...I
> am aware of Data logging hardware out there but again I would like to
> try to rig myself.
>
> Thanks in advance...
> Rob

Rob,

You can expand to four channels as a game port contains two sets joystick
connections. But without extra electronics that's the limit. You can look
for analog multiplexers to serve more thermistors but to control them you
need some output from the computer. The game port has no outputs so you'll
need the serial - or parallel port for it. When you come so far you can as
well go all the way and use the serial port to do whole the job. A PIC or
AVR micro with build in AD convertors and a UART will perform much better
then a game port both in reliability and accuracy. You sure will have to
invest in some hardware and have a learning curve but IMHO the alternative
will take the same cost with worse results.

petrus bitbyter 

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