#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <WiFi.h>
#include <PubSubClient.h>

#define DHTPIN 2            // Digital pin for DHT11 temperature sensor
#define DHTTYPE DHT11       // DHT type
#define SOIL_PIN 33         // Analog pin for soil moisture sensor
#define LIGHT_THRESHOLD 50  // Light threshold for day/night detection
#define IRRIGATION_THRESHOLD 300 // Soil moisture threshold for irrigation

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define MQTT_SERVER "mqtt-dashboard.com"
#define MQTT_PORT 8884
#define MQTT_USERNAME "Hello"
#define MQTT_PASSWORD "World"
#define MQTT_CLIENT_ID "clientId-H77nYZrwgf"

DHT dht(DHTPIN, DHTTYPE);
PubSubClient mqttClient(espClient);
LiquidCrystal_I2C lcd(0x27,16,2);

void setup_wifi() {
  delay(10);
  Serial.println("Connecting to WiFi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
}

void callback(char* topic, byte* payload, unsigned int length) {
  // Handle incoming messages
}

void reconnect() {
  while (!mqttClient.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (mqttClient.connect(MQTT_CLIENT_ID, MQTT_USERNAME, MQTT_PASSWORD)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  dht.begin();
  setup_wifi();
  mqttClient.setServer(MQTT_SERVER, MQTT_PORT);
  mqttClient.setCallback(callback);
  Wire.begin(23, 22);
  lcd.init();
  lcd.backlight();
}

void loop() {
  if (!mqttClient.connected()) {
    reconnect();
  }
  mqttClient.loop();
  
  // Read soil moisture
  int soilMoisture = analogRead(SOIL_PIN);
  
  // Read temperature and humidity
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

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

  // Publish sensor data to MQTT topics
  mqttClient.publish("smart_agriculture/soil_moisture", String(soilMoisture).c_str());
  mqttClient.publish("smart_agriculture/temperature", String(temperature).c_str());
  mqttClient.publish("smart_agriculture/humidity", String(humidity).c_str());

  // Smart irrigation control
  if (soilMoisture < IRRIGATION_THRESHOLD) {
    // Activate irrigation system
    Serial.println("Activating irrigation...");
    // Add code to control irrigation system (e.g., turn on water pump)
  }

  // Display soil moisture on LCD
  String msg = soilMoisture < 2165 ? "DRY" : soilMoisture > 3135 ? "DRY" : "OK";
  lcd.clear();
  lcd.print("Soil: ");
  lcd.print(msg);

  delay(5000); // Delay for 5 seconds before taking readings again
}






























// #include <Wire.h> 
// #include <LiquidCrystal_I2C.h>
// LiquidCrystal_I2C lcd(0x27,16,2);

// void setup()
// {
//   Wire.begin(23, 22);
//   Serial.begin(9600);
//   lcd.init();
//   lcd.backlight();
// }

// void loop()
// {
//   int16_t i = analogRead(34);
//   String msg = i < 2165 ? "DRY" : i > 3135 ? "DRY" : "OK";
//   lcd.clear();
//   lcd.print("Soil: ");
//   lcd.print(msg);
//   delay(500); 
// }