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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const unsigned long myChannelNumber = 2632414;
const char* myWriteAPIKey = "72647Q1HXSURG4GD";

const int pirPin = 12;  
const int buzzerPin = 14;
const int trigPin = 27;
const int echoPin = 26;
const int DHTPIN = 25;
const int ldrPin = 19;
const int ledPin = 4;
const int DHTTYPE = DHT22; 

LiquidCrystal_I2C lcd(0x27, 16, 2);

DHT dht(DHTPIN, DHTTYPE);

WiFiClient client;

void setup() {
  Serial.begin(115200);

  pinMode(ldrPin, INPUT);
  pinMode(ledPin, OUTPUT);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  dht.begin();

  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  lcd.init();
  lcd.backlight();
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("Super Duper Techno");
  delay(10000);
  lcd.clear();

  lcd.setCursor(0, 0);
  lcd.print("Booting U_U");
  delay(10000);
  lcd.clear();

WiFi.begin(ssid, password);
  Serial.print("You Are Connecting to Wi-Fi™⁜");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("You Have Connected to Wi-Fi");

  ThingSpeak.begin(client);
}

void loop() {

  int ldrVal = analogRead(ldrPin);
  Serial.println(ldrVal); 

 if (ldrVal > 1560) 
    digitalWrite(ledPin, HIGH); 
  else
    digitalWrite(ledPin, LOW); 

  delay(1000); 

long duration, distance;
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  
  distance = (duration * 0.0343) / 2;
  
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");


  int pirState = digitalRead(pirPin);

  if (pirState == HIGH) {
    
    digitalWrite(ledPin, HIGH);
    digitalWrite(buzzerPin, HIGH);

    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Life Detected!");

    
    Serial.println("Life Detected!");
  } else {
    
    digitalWrite(ledPin, LOW);
    digitalWrite(buzzerPin, LOW);

    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Life Not Found!");
    Serial.println("Life Not Found!");
  }

    delay(3000);

    ThingSpeak.setField(1, pirPin);
    ThingSpeak.setField(2, temperature);
    ThingSpeak.setField(3, humidity);
    ThingSpeak.setField(4, distance);
    ThingSpeak.setField(5, ldrVal);
    int httpCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(httpCode == 200) {
    Serial.println("Data sent successfully.");
  } else {
    Serial.print("Error sending data: ");
    Serial.println(httpCode);
  }
  
  delay(8000);
}