The resolution of the meter is only 10 bits, but that's not enough to explain such a variation.
Why are you setting Vmax to 15 since your Vmax is 12.50V in reality? Try to set Vmax = 12.50.
Are you running it on a Arduino board or on your own circuit?
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I'm just back from a three days trip to Halifax.
The resolution of the meter
The resolution of the meter is only 10 bits, but that's not enough to explain such a variation.
Why are you setting Vmax to 15 since your Vmax is 12.50V in reality? Try to set Vmax = 12.50.
Are you running it on a Arduino board or on your own circuit?