#define POWER_PIN  15 // ESP32 pin GPIO15 connected to sensor's VCC pin
#define SIGNAL_PIN 2 // ESP32 pin GPIO2 (ADC0) connected to sensor's signal pin
float value = 0; // variable to store the sensor value

void setup() {
  Serial.begin(9600);
  pinMode(POWER_PIN, OUTPUT);   // configure pin as an OUTPUT
  digitalWrite(POWER_PIN, LOW); // turn the sensor OFF
}

void loop() {
  digitalWrite(POWER_PIN, HIGH);  // turn the sensor ON
  delay(10);                      // wait 10 milliseconds
  value = analogRead(SIGNAL_PIN); // read the analog value from sensor
  digitalWrite(POWER_PIN, LOW);   // turn the sensor OFF

  Serial.print("The water level: ");
  Serial.print(value/4095*10,1);
  Serial.println("/10");

  if (value < 100)
    Serial.println("tank is almost empty");
  else if (value <2050)
    Serial.println("tank is almost half");
  else if (value > 4090)
    Serial.println("tank is almost full");
  
  delay(1000);
}