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

// Data wire is plugged into pin 5 on the Arduino
#define ONE_WIRE_BUS 5

// Pin Definitions for LEDs
const int redLEDPin = 2;
const int greenLEDPin = 3;
const int blueLEDPin = 4;

// Setup a oneWire instance to communicate with any OneWire devices (DS18B20)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);

// Variables for storing temperatures
float predetectTemp = 0;
float detectTemp = 0;
float currentTemp = 0;

void setup() {
  // Start up the library for the DS18B20 sensor
  sensors.begin();

  // Set LED pins as outputs
  pinMode(redLEDPin, OUTPUT);
  pinMode(greenLEDPin, OUTPUT);
  pinMode(blueLEDPin, OUTPUT);
  
  // Start Serial communication for debugging
  Serial.begin(9600);

  // Get the initial temperature reading
  predetectTemp = getTemperature();
  Serial.print("Initial Temperature: ");
  Serial.println(predetectTemp);
}

void loop() {
  // Get the current temperature
  detectTemp = getTemperature();
  
  // Calculate the difference between the current and initial temperature
  currentTemp = (detectTemp);
  
  Serial.print("Current Temperature: ");
  Serial.println(currentTemp);
  
  // Light up the appropriate LED based on the temperature difference
  if (currentTemp > 25) {
    lightLED(redLEDPin);  
    Serial.print("Aaah, panas!!   ");
  } else if (currentTemp <= 25 && currentTemp >= 0) {
    lightLED(greenLEDPin);  
    Serial.print("Normal, yeay!   ");
  } else if (currentTemp < 0) {
    lightLED(blueLEDPin);  
    Serial.print("Brrr, dingin...   ");
  }

  // Small delay between readings
  delay(500);
}

// Function to get temperature from DS18B20 sensor
float getTemperature() {
  // Request temperature reading from the sensor
  sensors.requestTemperatures();
  
  // Get the temperature in Celsius
  return sensors.getTempCByIndex(0);
}

// Function to light one LED and turn off others
void lightLED(int ledPin) {
  // Turn off all LEDs
  digitalWrite(redLEDPin, LOW);
  digitalWrite(greenLEDPin, LOW);
  digitalWrite(blueLEDPin, LOW);
  
  // Turn on the selected LED
  digitalWrite(ledPin, HIGH);
}