Hey,
We have an old water temperature thermometer in the house, and I'm trying to log that temperature, while the normal box continues to use this thermometer.
It works very nicely with a multimeter, I can read the voltage and convert that to temperature.
However if I replace the multimeter with an analog input of a Intel Galileo the original reading drops and the galileo also doesn't get the correct temp.
I'm guessing the internal resistance of the galileo is not high enough? I tried a resistor in front of the input but if it is large enough to make a difference I can't get an good reading anymore.
From what I read on the internet a "non-inverted, linear op-amp" might be the answer, but is it?
And if so, which one should I get?
Most seem to need quite a high supply voltage?
If I would get a MCP6041 and connect the output to the inverted input, would that do the job?
Thank you very much for any help in advance.
Marvin