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

// WiFi settings
const char *ssid = "Wokwi-GUEST";
const char *password = "";

// ThingSpeak settings
const char *thingSpeakApiKey = "48AV4UOLZV28TNBI";
const unsigned long thingSpeakUpdateInterval = 15000; // Update interval in milliseconds (15 seconds)
#define CHANNEL_ID 2431869

// Define DHT sensor
#define DHTPIN 4
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

// Define pin numbers for LCD
#define I2C_ADDR 0x27
#define LCD_COLS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLS, LCD_ROWS);

// Variables for ThingSpeak update
unsigned long previousThingSpeakUpdate = 0;

void setup() {
  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD
  lcd.begin(LCD_COLS, LCD_ROWS);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize ThingSpeak
  //ThingSpeak.begin();

  // Turn on LED for 0.5 seconds, then off for 0.5 seconds
  // This part is removed as per your request
}

void loop() {
  // Read humidity and temperature from DHT sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Print the values to the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  // Print the values to the serial monitor
  Serial.print("Humidity: ");
  Serial.println(humidity);
  Serial.print("Temperature: ");
  Serial.println(temperature);

  // Update ThingSpeak every specified interval
  unsigned long currentMillis = millis();
  if (currentMillis - previousThingSpeakUpdate >= thingSpeakUpdateInterval) {
    // Save the last update time
    previousThingSpeakUpdate = currentMillis;

    // Update ThingSpeak channel with temperature and humidity values
    ThingSpeak.setField(1, temperature);
    ThingSpeak.setField(2, humidity);
    int updateStatus = ThingSpeak.writeFields(CHANNEL_ID, thingSpeakApiKey);

    if (updateStatus == 200) {
      Serial.println("ThingSpeak update successful");
    } else {
      Serial.println("Error updating ThingSpeak. HTTP error code: " + String(updateStatus));
    }
  }

  // Add a delay to avoid continuous rapid readings
  delay(1000);
}