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

// Data wire is connected to pin 2 on the Arduino
#define ONE_WIRE_BUS 2

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

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

// Define the RGB LED pins
const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;

void setup() {
  // Start serial communication for debugging (optional)
  Serial.begin(9600);

  // Set the RGB LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  // Start the DS18B20 sensor
  sensors.begin();
}

void loop() {
  // Call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  sensors.requestTemperatures();

  // Get the temperature in Celsius
  float temperature = sensors.getTempCByIndex(0);

  // Print temperature to serial monitor (optional)
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Map temperature value to RGB color
  int redValue;
  int blueValue;

  if (temperature <= 0) {
    // If temperature is 0 or below, set RGB to blue
    redValue = 0;
    blueValue = 255;
  } else {
    // If temperature is above 0, gradually transition from blue to red
    redValue = map(temperature, 0, 100, 0, 255);
    blueValue = map(temperature, 0, 100, 255, 0);
  }

  // Constrain color values to stay within the defined range
  redValue = constrain(redValue, 0, 255);
  blueValue = constrain(blueValue, 0, 255);

  // Set RGB LED color
  analogWrite(redPin, redValue);
  analogWrite(greenPin, 0);   // Green component is kept off
  analogWrite(bluePin, blueValue);

  // Delay between readings (adjust as needed)
  delay(1000); // Read temperature every second
}