Update main.cpp to add ADC filters to reduce noise on voltage and current sensor #106
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Added an IIR filter with a weight of 90% to the battery voltage, charge voltage, and charging current to reduce the noise in the ADC measurements.
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With the sample rate being only 10Hz I think a weight of 80% is probably better. |
GPIO23 is connected to the PS pin of the onboard RT6150B-33GQW, if it's LOW (default) it's in PFM mode for best efficiency, if it's HIGH it's in PWM mode for improved ripple but worse efficiency at light loads. PWM mode should improve the ADC noise.
GPIO23 is connected to the PS pin of the onboard RT6150B-33GQW, if it's LOW (default) it's in PFM mode for best efficiency, if it's HIGH it's in PWM mode for improved ripple but worse efficiency at light loads. PWM mode should improve the ADC noise.
Jahnkeanater
commented
Aug 28, 2024
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Putting the power supply into PWM mode by pulling GPIO23 High should also help improve the ADCs.
#75 Removing this since it might actually make the noise worse.
Jahnkeanater
changed the title
Looks like other people have already proved that PWM mode doesn't improve the noise.
Jahnkeanater
changed the title
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Added an IIR filter with a weight of 90% to the battery voltage, charge voltage, and charging current to reduce the noise in the ADC measurements.