[Arduino source code for KC868-M16v2]-04 calibrate AC voltage

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Code:

/**
* This program shows how we can get (estimate) the right sensitivity value for
* the sensor.
*
* This program will swipe from the lowest sensitivity estimate value to the
* highest. The program will stop if the voltage reading result from the sensor
* is within the specified tolerance limit or the sensitivity value has exceeded
* the highest predetermined value (which in this case is considered failed to
* be determined).
*/

#include <ZMPT101B.h>

#define ACTUAL_VOLTAGE 220.0f // Change this based on actual voltage

#define START_VALUE 0.0f
#define STOP_VALUE 1000.0f
#define STEP_VALUE 0.25f
#define TOLLERANCE 1.0f

#define MAX_TOLLERANCE_VOLTAGE (ACTUAL_VOLTAGE + TOLLERANCE)
#define MIN_TOLLERANCE_VOLTAGE (ACTUAL_VOLTAGE - TOLLERANCE)

// ZMPT101B sensor output connected to analog pin A0
// and the voltage source frequency is 50 Hz.
ZMPT101B voltageSensor(34, 50.0);

void setup() {
  Serial.begin(115200);
  Serial.print("The Actual Voltage: ");
  Serial.println(ACTUAL_VOLTAGE);

  float senstivityValue = START_VALUE;
  voltageSensor.setSensitivity(senstivityValue);
  float voltageNow = voltageSensor.getRmsVoltage();

  Serial.println("Start calculate");

  while (voltageNow > MAX_TOLLERANCE_VOLTAGE || voltageNow < MIN_TOLLERANCE_VOLTAGE) {
    if (senstivityValue < STOP_VALUE) {
      senstivityValue += STEP_VALUE;
      voltageSensor.setSensitivity(senstivityValue);
      voltageNow = voltageSensor.getRmsVoltage();
      Serial.print(senstivityValue);
      Serial.print(" => ");
      Serial.println(voltageNow);
    } else {
      Serial.println("Unfortunately the sensitivity value cannot be determined");
      return;
    }
  }

  Serial.print("Closest voltage within tolerance: ");
  Serial.println(voltageNow);
  Serial.print("Sensitivity Value: ");
  Serial.println(senstivityValue, 10);
}

void loop() {}

before use code, install zmpt101b arduino library firstly.