>>2880661
>Noise
Wep, I will think about that. but nothing a capacitor and a coil couldn't filter indeed.
And you are correct too, with the speed of reading of those multimeters, it won't be a proble either I think.
>Serial port
I had one with an IrDa port outputing serial data. I used it once or twice thith the good software to graph temperature (it had direct temperature reading from probe).
Some other have a direct connector (so no isolation):
https://www.forward.com.au/pfod/pfodDataLogging/highAccuracyDataLogging.html

>>2880678
It's okay, the LiIon battery will be charging by USB. And I can tune the buck convertor to 3.3V or whatever I want to simulate new AA batteries.

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