#define SOIL_ANALOG_PIN 34  // Connected to sensor A0
#define SOIL_DIGITAL_PIN 25 // Connected to sensor D0
#define ALERT_LED_PIN 2     // Alert LED

void setup() {
  Serial.begin(115200);
  pinMode(SOIL_DIGITAL_PIN, INPUT);
  pinMode(ALERT_LED_PIN, OUTPUT);
  
  Serial.println("--- Capacitive Soil Moisture Sensor System Ready ---");
}

void loop() {
  int rawADC = analogRead(SOIL_ANALOG_PIN);
  float voltage = (rawADC / 4095.0) * 3.3;

  // Real sensor voltage mapping (3.0V = 0% Dry, 1.0V = 100% Wet)
  int moisturePercent = map(rawADC, 3722, 1241, 0, 100);
  moisturePercent = constrain(moisturePercent, 0, 100);

  int isDry = digitalRead(SOIL_DIGITAL_PIN);

  Serial.print("Moisture: ");
  Serial.print(moisturePercent);
  Serial.print("% | ADC: ");
  Serial.print(rawADC);
  Serial.print(" | Voltage: ");
  Serial.print(voltage, 2);
  Serial.print("V | Status: ");

  if (isDry == HIGH) {
    Serial.println("⚠️ DRY SOIL - IRRIGATION NEEDED!");
    digitalWrite(ALERT_LED_PIN, HIGH);
  } else {
    Serial.println("✅ MOISTURE NORMAL");
    digitalWrite(ALERT_LED_PIN, LOW);
  }

  delay(1000);
}