Datasheet

// Let the ADC settle

delay(1);

// Get the raw 12-bit, 0..3000mV ADC value

raw = analogRead(vbat_pin);

// Set the ADC back to the default settings

analogReference(AR_DEFAULT);

analogReadResolution(10);

// Convert the raw value to compensated mv, taking the resistor-

// divider into account (providing the actual LIPO voltage)

// ADC range is 0..3000mV and resolution is 12-bit (0..4095)

return raw * REAL_VBAT_MV_PER_LSB;

}

uint8_t mvToPercent(float mvolts) {

if(mvolts<3300)

return 0;

if(mvolts <3600) {

mvolts -= 3300;

return mvolts/30;

}

mvolts -= 3600;

return 10 + (mvolts * 0.15F ); // thats mvolts /6.66666666

}

void setup() {

Serial.begin(115200);

while ( !Serial ) delay(10); // for nrf52840 with native usb

// Get a single ADC sample and throw it away

readVBAT();

}

void loop() {

// Get a raw ADC reading

float vbat_mv = readVBAT();

// Convert from raw mv to percentage (based on LIPO chemistry)

uint8_t vbat_per = mvToPercent(vbat_mv);

// Display the results

Serial.print("LIPO = ");

Serial.print(vbat_mv);

Serial.print(" mV (");

Serial.print(vbat_per);

Serial.println("%)");

delay(1000);

}