#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// OLED display dimensions
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Declare OLED reset pin (use -1 if not using a reset pin)
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DS18B20 pin
#define ONE_WIRE_BUS 4  // Pin connected to the DS18B20

// Setup oneWire and DallasTemperature objects
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  // Initialize Serial for debugging
  Serial.begin(9600);
  while (!Serial);

  // Initialize the OLED display
  if (!display.begin(SSD1306_I2C_ADDRESS, 0x3C)) { // Address 0x3C for most SSD1306 displays
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Loop forever if initialization fails
  }

  // Clear the buffer
  display.clearDisplay();
  display.display();

  // Initialize the DS18B20 sensor
  sensors.begin();

  // Display welcome message
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(F("Temperature Monitor"));
  display.display();
  delay(2000); // Wait 2 seconds
}

void loop() {
  sensors.requestTemperatures(); // Request temperature readings from the sensor
  float temperature = sensors.getTempCByIndex(0); // Get the temperature in Celsius

  // Print temperature to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");

  // Display temperature on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(F("Temperature Monitor"));
  display.setTextSize(2);
  display.setCursor(0, 20);
  display.print(temperature);
  display.println(" C");
  display.display();

  delay(1000); // Update every second
}