RE: LZ: Thermometer
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RE: LZ: Thermometer
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Subject: RE: LZ: Thermometer
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From: Edward Plese <eplese@lnd.com>
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Date: Wed, 21 Aug 1996 16:55:38 -0500
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In-Reply-To: <>
>Hmm... if you did a DPDT switch thing with it, you might be able to switch
>it on and off... but with the chip in it would most likely mess up links.
I wasn't sure if it would, because the chip only responds to I2C commands
and after it has been addressed through certain commands.
>Try building it on a breadboard with a link mockup first. Wouldn't want
you
>to bust your calculator.
I already built it on a breadboard and it works great!!! The only thing is
that it is a surface mount chip and I had to etch a carrier board for it.
>I was thinking of doing the same thing a while ago with a thermistor
instead
>of a chip... if somehow the changes in current could be measured, that
could
>be used. Then the only affect in the link would be a small loss of
current
>if it accidentally went through the thermistor. But I'd put a switch in
>anyway. Maybe I'll try doing this again, I think I once did a thermistor
>setup on a breadboard that switched on a LED once it had passed a certain
>temperature, if that certain temperature could be monitored and changed
via
>the port it would work.
Why bother, this chip does all that. The chip has a sensor that will
measure the temperature and then the analog output goes through an analog
to digital converter and is stored in a two byte register that is
accessible through I2C routines. Also in the chip is a R/W control
register and two other registers that are also R/W. The chip has an output
that goes active (configurable to either high or low in the control
register). When the temperature drops below the other register, the output
goes inactive. It also has a shutdown mode so it draws even less current.
It's amazing what they can fit into a tiny 8 pin chip.
Oh, and the output of the chip is in degrees Celcius, but today I wrote a
conversion for it in the software.
Ed Plese, Jr.
(eplese@lnd.com)
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