Voltage/current/power/energy meter using the Raspberry Pi Pico, aiming to be ± 0.1% @ 0-24V and 0-1A
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Even when oversampling by averaging over 10,000 samples, we noticed that there were significant errors (up to ± 10%) with the voltage measurements:
This seems to be due to the poor DNL and INL (differential and integral non-linearity respectively) of the Raspberry Pi Pico ADC, as our measured "jumps" correspond almost exactly to the Pico's DNL spikes as measured by Mark Omo's excellent characterization of the Pico's ADC.
Methodology and raw calibration data for our Pico is available here.
TODO: Final accuracy and repeatability specs are pending a better automation calibration script being completed.
This project is licensed under NONE, TBD. For more information, please see TBD.
