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a7670 voltage calibration fix

This commit is contained in:
richonguzman 2024-07-17 10:47:42 -04:00
parent 008b6250ea
commit 16ce6bc6d2
1 changed files with 11 additions and 7 deletions
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18
src/battery_utils.cpp
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@ -135,14 +135,18 @@ namespace BATTERY_Utils {
double inputDivider = (1.0 / (390.0 + 100.0)) * 100.0; // The voltage divider is a 390k + 100k resistor in series, 100k on the low side. double inputDivider = (1.0 / (390.0 + 100.0)) * 100.0; // The voltage divider is a 390k + 100k resistor in series, 100k on the low side.
return (((sampleSum/100) * adcReadingTransformation) / inputDivider) + 0.285; // Yes, this offset is excessive, but the ADC on the ESP32s3 is quite inaccurate and noisy. Adjust to own measurements. return (((sampleSum/100) * adcReadingTransformation) / inputDivider) + 0.285; // Yes, this offset is excessive, but the ADC on the ESP32s3 is quite inaccurate and noisy. Adjust to own measurements.
#else #else
if (calibrationEnable){ #ifdef HAS_ADC_CALIBRATION
float voltage = esp_adc_cal_raw_to_voltage(sampleSum / 100, &adc_chars); if (calibrationEnable){
voltage *= 2; // for 100K/100K voltage divider float voltage = esp_adc_cal_raw_to_voltage(sampleSum / 100, &adc_chars);
voltage /= 1000; voltage *= 2; // for 100K/100K voltage divider
return voltage; voltage /= 1000;
} else { return voltage;
} else {
return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection; // raw voltage without mapping
}
#else
return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection; // raw voltage without mapping return (2 * (sampleSum/100) * adcReadingTransformation) + voltageDividerCorrection; // raw voltage without mapping
} #endif
#endif #endif
// return mapVoltage(voltage, 3.34, 4.71, 3.0, 4.2); // mapped voltage // return mapVoltage(voltage, 3.34, 4.71, 3.0, 4.2); // mapped voltage
#endif #endif