arduino/libraries/Bluefruit52Lib/examples/Hardware/adc/adc.ino


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int adcin    = A5;
int adcvalue = 0;
float mv_per_lsb = 3600.0F/1024.0F; // 10-bit ADC with 3.6V input range

void setup() {
  Serial.begin(115200);
  while ( !Serial ) delay(10);   // for nrf52840 with native usb
}

void loop() {
  // Get a fresh ADC value
  adcvalue = analogRead(adcin);

  // Display the results
  Serial.print(adcvalue);
  Serial.print(" [");
  Serial.print((float)adcvalue * mv_per_lsb);
  Serial.println(" mV]");

  delay(100);
}