// Include required libraries
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Pin definitions
#define ONE_WIRE_BUS 2    // DS18B20 data pin connected to GP2
#define SCREEN_WIDTH 128  // OLED display width
#define SCREEN_HEIGHT 64  // OLED display height
#define OLED_RESET    -1  // Reset pin # (or -1 if sharing Arduino reset pin)

// Initialize objects
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  // Start serial communication for debugging
  Serial.begin(115200);
  
  // Initialize the DS18B20 sensor
  sensors.begin();
  
  // Initialize OLED display with I2C address 0x3C
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  // Clear the display buffer
  display.clearDisplay();
  display.setTextSize(2);      // Normal 2:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0,0);      // Start at top-left corner
  display.display();
}

void loop() {
  // Request temperature readings
  sensors.requestTemperatures();
  
  // Get temperature in Celsius
  float tempC = sensors.getTempCByIndex(0);
  
  // Check if reading is valid
  if(tempC == DEVICE_DISCONNECTED_C) {
    Serial.println("Error: Could not read temperature data");
    return;
  }

  // Convert temperature to string with 1 decimal place
  char tempStr[8];
  dtostrf(tempC, 6, 1, tempStr);

  // Clear display
  display.clearDisplay();
  
  // Display temperature
  display.setCursor(0,0);
  display.println("Temp:");
  display.setCursor(0,20);
  display.print(tempStr);
  display.print(" C");
  
  // Update display
  display.display();

  // Print to serial monitor for debugging
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" C");

  // Wait 1 second before next reading
  delay(1000);
}