#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server = "api.thingspeak.com";
String apiKey = "RIKAROA6N3I1MLC1";
#define DHT_PIN 4
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
unsigned long lastTime = 0;
unsigned long timerDelay = 15000; 
bool wifiConnected = false;
bool thingSpeakConnected = false;
float temperature = 0;
float humidity = 0;
void setup() 
{
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Starting System");
  lcd.setCursor(0, 1);
  lcd.print("Please Wait...");
  dht.begin();
  delay(2000);
  connectToWiFi();
  readSensors();
  Serial.println("System initialized");
}
void loop() 
{
  if (WiFi.status() == WL_CONNECTED) 
  {
    wifiConnected = true;
    readSensors();
    if ((millis() - lastTime) > timerDelay) 
    {
      sendToThingSpeak();
      lastTime = millis();
    }
  } 
  else 
  {
    wifiConnected = false;
    thingSpeakConnected = false;
    Serial.println("WiFi Disconnected");
    connectToWiFi();
  }
  updateLCD();
  delay(2000); 
}
void connectToWiFi() 
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Connecting WiFi");
  lcd.setCursor(0, 1);
  lcd.print("Please wait...");
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) 
  {
    delay(500);
    Serial.print(".");
    attempts++;
  }
  if (WiFi.status() == WL_CONNECTED) 
  {
    wifiConnected = true;
    Serial.println();
    Serial.println("WiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WiFi Connected!");
    lcd.setCursor(0, 1);
    lcd.print(WiFi.localIP());
    delay(3000);
  } 
  else 
  {
    wifiConnected = false;
    Serial.println();
    Serial.println("Failed to connect to WiFi");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WiFi Failed!");
    lcd.setCursor(0, 1);
    lcd.print("Check Settings");
    delay(3000);
  }
}
void readSensors() 
{
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  if (isnan(temperature) || isnan(humidity)) 
  {
    Serial.println("Failed to read from DHT sensor!");
    temperature = 0;
    humidity = 0;
  } 
  else 
  {
    Serial.printf("Temperature: %.1f°C, Humidity: %.1f%%\n", temperature, humidity);
  }
}
void sendToThingSpeak() 
{
  if (WiFi.status() == WL_CONNECTED) 
  {
    HTTPClient http;
    String url = "http://api.thingspeak.com/update?api_key=" + apiKey;
    url += "&field1=" + String(temperature);
    url += "&field2=" + String(humidity);
    Serial.println("Sending to ThingSpeak: " + url);
    http.begin(url);
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) 
    {
      String response = http.getString();
      Serial.println("ThingSpeak Response: " + response);
      if (response.toInt() > 0) 
      {
        thingSpeakConnected = true;
        Serial.println("Data sent successfully to ThingSpeak!");
      } 
      else 
      {
        thingSpeakConnected = false;
        Serial.println("Failed to send data to ThingSpeak");
      }
    } 
    else 
    {
      thingSpeakConnected = false;
      Serial.printf("Error sending to ThingSpeak: %d\n", httpResponseCode);
    }
    http.end();
  }
}
void updateLCD() 
{
  lcd.clear();
  lcd.setCursor(0, 0);
  if (wifiConnected) 
  {
    if (thingSpeakConnected) 
    {
      lcd.print("Net:OK TS:OK");
    } 
    else 
    {
      lcd.print("Net:OK TS:FAIL");
    }
  } 
  else 
  {
    lcd.print("Net:DISCONNECTED");
  }
  lcd.setCursor(0, 1);
  if (!isnan(temperature) && !isnan(humidity)) 
  {
    lcd.printf("%.1fC %.1f%%", temperature, humidity);
  } 
  else 
  {
    lcd.print("Sensor Error");
  }
  static unsigned long statusTime = 0;
  if (millis() - statusTime > 10000) 
  {
    showDetailedStatus();
    statusTime = millis();
  }
}
void showDetailedStatus() 
{
  if (wifiConnected) 
  {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("IP Address:");
    lcd.setCursor(0, 1);
    lcd.print(WiFi.localIP());
    delay(2000);
  }
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("ThingSpeak:");
  lcd.setCursor(0, 1);
  if (thingSpeakConnected) 
  {
    lcd.print("Data Sent OK");
  } 
  else 
  {
    lcd.print("Connection Failed");
  }
  delay(2000);
}