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

#define ONE_WIRE_BUS 2 // Pin for DS18B20
#define BUZZER_LED_PIN 3 // Pin for Buzzer and LED
#define BUTTON_PIN 4    // Pin for Manual Check Button

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27, 16 columns and 2 rows

float alarmThreshold = 25.0; // Temperature threshold for the alarm in Celsius
boolean alarmTriggered = false;
boolean manualCheckInProgress = false;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  pinMode(BUZZER_LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Using internal pull-up resistor
}

void loop() {
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);

  lcd.clear();  // Clear the LCD display
  
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature, 1);
  lcd.print(" C");

  lcd.setCursor(0, 1);

  if (temperature > alarmThreshold) {
    lcd.print("Above 25 C");
    if (!alarmTriggered && !manualCheckInProgress) {
      triggerAlarm();
    }
  } else {
    if (alarmTriggered) {
      resetAlarm();
    }
  }

  // Manual check for the alarm using a button
  if (digitalRead(BUTTON_PIN) == LOW) {
    manualCheck();
  }

  delay(1000); // Adjust the delay as needed
}

void triggerAlarm() {
  float temperature;
  do {
    sensors.requestTemperatures();
    temperature = sensors.getTempCByIndex(0);

    digitalWrite(BUZZER_LED_PIN, HIGH); // Turn on the LED and Buzzer
    delay(500); // Delay for half a second
    digitalWrite(BUZZER_LED_PIN, LOW); // Turn off the LED and Buzzer
    delay(500); // Delay for half a second
  } while (temperature > alarmThreshold);

  alarmTriggered = true;
}

void resetAlarm() {
  digitalWrite(BUZZER_LED_PIN, LOW); // Turn off the LED and Buzzer
  alarmTriggered = false;
}

void manualCheck() {
  digitalWrite(BUZZER_LED_PIN, HIGH); // Turn on the LED and Buzzer
  delay(1000); // Keep the LED and Buzzer on for 1 second
  digitalWrite(BUZZER_LED_PIN, LOW); // Turn off the LED and Buzzer
  manualCheckInProgress = true;
  delay(1000); // Delay for additional 1 second to prevent conflicts
  manualCheckInProgress = false;
}