Soil Moisture sensor calibration Arduino ESP 32

calibrationSensor.ino

/*
// Calibration Capacitive Soil Moisture Sensor with ESP32 
// use Serial Plotter of Arduino per determinare wet/dry values
// Reduse sensor tension to 1,63 volts : I used 2 resistors of 100 Ohms see diagram in post
// https://forum.micropython.org/viewtopic.php?t=4487 
// 2020
*/


#include <Arduino.h> //for vscode
#include <SPI.h>
#include <Wire.h>

const int AirValue = 770;   //you need to replace this value with Value_1
const int WaterValue = 840;  //you need to replace this value with Value_2

const int SensorPin = 32;
int soilMoistureValue = 0;
int soilmoisturepercent=0;
int numMeasure = 10;                                // Number of measurements to average.
 
// This function reads the soil moisture sensor numAve times and returns the average.
long readSoil(int numAve)
{
  long ADCValue = 0;
  for ( int i = 0; i < numAve; i++ ) {
    delay(250);    // Wait  milliseconds for sensor to settle.
    ADCValue += analogRead( SensorPin );     // Read the value from sensor.
      }
  
  ADCValue = ADCValue / numAve;
  soilmoisturepercent = map(ADCValue, AirValue, WaterValue, 0, 100);
//return ADCValue; 
if(soilmoisturepercent > 100) { soilmoisturepercent =100;}
if(soilmoisturepercent < 0) { soilmoisturepercent =0;}

  return soilmoisturepercent;                    // Return the moisture value.
} 

void setup() {
  Serial.begin(115200); // open serial port, set the baud rate to 9600 bps
}
 
void loop() 
{
soilMoistureValue = readSoil( numMeasure );  //put Sensor insert into soil
Serial.println(soilMoistureValue);
  delay(250);
}