// Program: WaterLevelWarning-E_v3.ino
// Wokwi:   https://wokwi.com/projects/376766975385873409
// Use GPIO36 (VP)

const int sensorPin = 36;     // define input pin for the
                              // tank level sensor
const int sensorMin = 0;      // sensor minimum
const int sensorMax = 4095;   // sensor maximum

void setup() {
  // initialize serial communication
  Serial.begin(115200);
}

void loop() {
  int sensorReading, waterLevel;

  // read the sensor value
  // (4095 - 0) * 3/4 + 1 = 3071 + 1 = 3072
  // 0-1023 -> 0, 1024-2047 -> 1, 2048-3071 -> 2, 3072-4095 -> 3
  sensorReading = analogRead(sensorPin);
  Serial.print(sensorReading);
  Serial.print(", ");

  // scale the sensor range to a range of four water levels (0 ~ 3)
  waterLevel = map(sensorReading, sensorMin, (3 * sensorMax + sensorMin) / 4 + 1, 0, 3);
  Serial.print(waterLevel);
  Serial.print(", ");

  // print something different depending on the scaled water level
  switch (waterLevel) {
    case 0: Serial.println("Water Level Nearly OUT");
      break;
    case 1: Serial.println("Water Level Low");
      break;
    case 2: Serial.println("Water Level Medium");
      break;
    case 3: Serial.println("Water Level Nearly FULL");
      break;
  }
}