#include <DHT.h>
#include <ESP32Servo.h> // Use ESP32Servo instead of Servo library
#include <SPI.h>
#include <SD.h>

// Blynk credentials
#define BLYNK_TEMPLATE_ID "TMPL2f5YLyu1U"
#define BLYNK_TEMPLATE_NAME "Smart watering system"
#define BLYNK_AUTH_TOKEN "pMXXgwg8K89AB9n3mWizEn7Slh2yKbjV"

#define DHTPIN 4        // DHT22 data pin
#define DHTTYPE DHT22    // DHT 22 (AM2302)
#define LED_PIN 12      // LED connected to GPIO 23
#define SERVO_PIN 13     // Servo control pin
#define SD_CS 5       // SD card chip select cs pin
// Global Variables

// Global Variables
Servo servo;             // ESP32Servo object
DHT dht(DHTPIN, DHTTYPE); // DHT object for temperature and humidity
File dataFile;           // File object for SD card operations

void setup() {
    // Initialize Serial Monitor
    Serial.begin(115200);
    while (!Serial) {
        ; // Wait for Serial Monitor to connect
    }

    // Initialize DHT Sensor
    dht.begin();
    Serial.println("DHT22 Sensor Initialized");

    // Initialize Servo
    servo.attach(SERVO_PIN); // Attach servo to GPIO 14
    servo.write(0); // Set initial position to 0 degrees
    Serial.println("Servo Initialized");

    // Initialize LED
    pinMode(LED_PIN, OUTPUT);
    digitalWrite(LED_PIN, LOW);
    Serial.println("LED Initialized");

    // Initialize SD Card
    if (!SD.begin(SD_CS)) {
        Serial.println("SD card initialization failed!");
        return;
    }
    Serial.println("SD card initialized successfully.");


     Blynk.begin(auth, "Your_SSID", "Your_PASSWORD");  // Replace with your WiFi credentials
}

void loop() {
    // Read Temperature and Humidity
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();

    // Check if readings are valid
    if (isnan(temperature) || isnan(humidity)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }

    // Print readings to Serial Monitor
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");

    // Log data to SD card
    File dataFile = SD.open("data.txt", FILE_WRITE);
    if (dataFile) {
        dataFile.print("Temperature: ");
        dataFile.print(temperature);
        dataFile.print(" °C, Humidity: ");
        dataFile.print(humidity);
        dataFile.println(" %");
        dataFile.close();
        Serial.println("Data logged to SD card.");
    } else {
        Serial.println("Failed to open file on SD card.");
    }

    // Control Servo and LED based on temperature
    if (humidity < 60 ) {
        servo.write(90); // Move servo to 90 degrees
        digitalWrite(LED_PIN, HIGH); // Turn on LED
    } else {
        servo.write(0); // Move servo back to 0 degrees
        digitalWrite(LED_PIN, LOW); // Turn off LED
    }

    // Send data to Blynk
    Blynk.virtualWrite(V1, temperature); // Send temperature data to Blynk app
    Blynk.virtualWrite(V2, humidity);    // Send humidity data to Blynk app


    // Wait before taking the next reading
    delay(2000);
}