#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>



// DS18B20 Temperature Sensor on Pin 8
OneWire oneWire(8);
DallasTemperature sensor(&oneWire);

// PIR Sensor on Pin 9
int inputPin = 9;                
int pirState = LOW;              
int val = 0;   

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(void) {
  Serial.begin(115200);
  delay(200); // Increased delay for sensor initialization
  sensor.begin();

  pinMode(inputPin, INPUT);
  Serial.println("System Initialized...");

  lcd.init();
  lcd.backlight();
  lcd.print("Hello World!");
}

void loop(void) {
  // Read and display temperature
  sensor.requestTemperatures();
  float tempC = sensor.getTempCByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");
  delay(1000);

  // PIR Sensor - Motion Detection
  val = digitalRead(inputPin); 
  if (val == HIGH && pirState == LOW) {    
    Serial.println("Motion detected!");
    pirState = HIGH;
  } 
  else if (val == LOW && pirState == HIGH) {
    Serial.println("Motion ended!");
    pirState = LOW;
  }

  delay(200); // Small delay to avoid excessive serial prints
}