#include <DHT.h>

// ----- Pin Definitions -----
#define DHTPIN D4           // DHT22 Data Pin connected to D4 (GPIO2)
#define DHTTYPE DHT22       // DHT22 Sensor
#define SOIL_PIN A0         // Soil Moisture Sensor analog pin
#define RELAY_PIN D2        // Relay module connected to D2 (GPIO4)
#define LED_PIN D5          // LED (pump indicator) on D5 (GPIO14)

DHT dht(DHTPIN, DHTTYPE);   // Initialize DHT

void setup() {
  Serial.begin(115200);     // Serial Monitor for debugging
  dht.begin();              // Start DHT sensor

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);  // Pump OFF initially
  digitalWrite(LED_PIN, LOW);    // LED OFF
}

void loop() {
  // ----- Read Sensors -----
  float temperature = dht.readTemperature(); // Celsius
  float humidity = dht.readHumidity();       // Percentage
  int soilMoisture = analogRead(SOIL_PIN);   // 0 (wet) to 1023 (dry)

  // ----- Print to Serial -----
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C | Humidity: ");
  Serial.print(humidity);
  Serial.print(" % | Soil Moisture: ");
  Serial.println(soilMoisture);

  // ----- Logic to Control Pump -----
  if (soilMoisture > 700) { // Soil is dry
    digitalWrite(RELAY_PIN, HIGH); // Turn ON pump
    digitalWrite(LED_PIN, HIGH);   // Turn ON LED
    Serial.println("Soil is dry. Pump ON.");
  } else {
    digitalWrite(RELAY_PIN, LOW);  // Turn OFF pump
    digitalWrite(LED_PIN, LOW);    // Turn OFF LED
    Serial.println("Soil is wet. Pump OFF.");
  }

  delay(3000); // Delay between readings
}