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Offsetting a voltage output from a temperature sensor.

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Richard Hole

New Member
Hello

I have a weather station to freely provide data to communities via my
Worldwide Online Weather Organization with High Quality Detailed Graphs & Reliable Meteorology Data. website. I have been using an interface to sample
voltages from my sensors which are then converted by
Microsoft Excel to the recordings.

Unfortunately, a few days back the input for the wet bulb temperature
sensor on the interface no longer seems to be working. However, I do
have other inputs but they do not offset the voltage of the temperature
sensor. Therefore, I need a circuit built to offset the voltage output
of the LM335Z temperature sensor. The inputs that work on the interface
sample voltages from 0 to 0.7 volts. To get a good resolution I would
like to work over a range of 51 degrees Celsius which would mean the
smallest increment on the software would be 0.2 degrees. So it would be
good to have a lowest reading of -7 degrees Celsius where the output is
0 volts and the highest reading of 43 degrees where the output is 0.7
volts. However, if a range of 0 to 0.7 volts is too hard to do, I could
use the other interface that ranges from 0 to 5 volts

There is some information about the LM335Z temperature sensors at
**broken link removed** and
https://www.electro-tech-online.com/custompdfs/2010/09/LM135.pdf

Do you know of a simple circuit that can offset the voltage like I
require? I saw some by searching Google for ‘offset
voltage circuit’ . Could any of these be suitable?

Do you know anyone that could help me build a circuit to do this if you
are not able to make it up?

Also, do you know anyone to help me make up some other circuits that
could benefit many people? Please see more information at
Electronics Projects that Could Benefit Many People

Your help is appreciated
Regards Richard.
 
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