#include <Wire.h>
#include <LiquidCrystal.h>
#include <DHT.h>
#include <ThingSpeak.h>
#include <WiFi.h>

#define DHTPIN 15         // Pin where the DHT sensor is connected
#define DHTTYPE DHT22     // Type of DHT sensor
#define SOIL_MOISTURE_PIN 34 // Pin where the soil moisture sensor is connected

const char *ssid = "Wokwi-GUEST";
const char *password = "";

// ThingSpeak parameters
char* apiKey = "YOUR_THINGSPEAK_API_KEY";
unsigned long channelID = YOUR_THINGSPEAK_CHANNEL_ID;

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

// Initialize LCD
LiquidCrystal lcd(23, 22, 21, 19, 18, 5); 

// Initialize WiFi client
WiFiClient client;

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.begin(16, 2);   // Initialize the LCD with 16 columns and 2 rows

 // Connect to Wi-Fi
  WiFi.begin(ssid, password);

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");

  // Initialize ThingSpeak with WiFi client
  ThingSpeak.begin(client);

  // Check if connected to WiFi
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connected to WiFi");
  } else {
    Serial.println("WiFi connection failed");
  }
}

void loop() {
  // Read temperature and humidity from DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Read soil moisture
  
  int soilMoisture = analogRead(SOIL_MOISTURE_PIN) - 620 / 1940;
   
  // Display temperature and humidity on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C  Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  // Display soil moisture on LCD
  lcd.setCursor(0, 1);
  lcd.print("Soil Moisture: ");
  lcd.print(soilMoisture);

  // Update ThingSpeak channel with sensor data
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, soilMoisture);
  ThingSpeak.writeFields(channelID, apiKey);

  delay(15000); // Adjust delay as needed (15 seconds in this case)
}