#include <OneWire.h>
#include <DallasTemperature.h>
#include <Servo.h>
#include <LiquidCrystal.h>

// Pin Definitions
#define ONE_WIRE_BUS 2 // DS18B20 on Arduino pin 2
#define SERVO_PIN 9    // Servo on Arduino pin 9
#define LED_RED 5      // Red LED on Arduino pin 5
#define LED_GREEN 4    // Green LED on Arduino pin 4
#define BUTTON_PIN 3   // Pushbutton on Arduino pin 3
#define POT_PIN A0     // Potentiometer on analog pin A0

// LCD Pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12); 

// Setup a oneWire instance to communicate with any OneWire device
OneWire oneWire(ONE_WIRE_BUS);

// Pass oneWire reference to DallasTemperature library
DallasTemperature sensors(&oneWire);

Servo myservo;
bool systemActive = false;
int potValue = 0;
int tempThreshold = 0;

void setup() {
  // Start the DS18B20 sensor
  sensors.begin();
  
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);

  // Initialize static text on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.setCursor(0, 1);
  lcd.print("Threshold: ");

  // Initialize the servo
  myservo.attach(SERVO_PIN);
  
  // Initialize the LED pins as outputs
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);

  // Initialize the pushbutton pin as an input
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  // Check if the button is pressed
  if (digitalRead(BUTTON_PIN) == LOW) {
    delay(500); // Debouncing delay
    systemActive = !systemActive;
  }

  if (systemActive) {
    // Read temperature
    sensors.requestTemperatures();
    float temperatureC = sensors.getTempCByIndex(0);

    // Read potentiometer
    potValue = analogRead(POT_PIN);
    tempThreshold = map(potValue, 0, 1023, 0, 100); // Map potentiometer to temperature range

    // Adjust servo based on temperature
    if (temperatureC > tempThreshold) {
      myservo.write(180);
      digitalWrite(LED_RED, HIGH);
      digitalWrite(LED_GREEN, LOW);
    } else {
      myservo.write(90);
      digitalWrite(LED_RED, LOW);
      digitalWrite(LED_GREEN, HIGH);
    }

    // Update temperature value on LCD
    lcd.setCursor(6, 0); // Set cursor to where the temperature value should start
    lcd.print(temperatureC);
    lcd.print(" C  "); // Extra spaces to clear previous longer values

    // Update threshold value on LCD
    lcd.setCursor(12, 1); // Set cursor to where the threshold value should start
    lcd.print(tempThreshold);
    lcd.print(" C  "); // Extra spaces to clear previous longer values
  } else {
    // Turn off LEDs and reset servo when system is inactive
    digitalWrite(LED_RED, LOW);
    digitalWrite(LED_GREEN, LOW);
    myservo.write(90); // Reset position
    lcd.clear();

    // Reinitialize static text on the LCD after clearing
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.setCursor(0, 1);
    lcd.print("Threshold: ");
  }
}