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

// Define the pin for the DS18B20 sensor
#define ONE_WIRE_BUS 2

// OLED display dimensions
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1

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

// Variables for temperature tracking
float currentTemp = 0.0;
float minTemp = 100.0;  // Initialize to a high value
float maxTemp = -100.0; // Initialize to a low value
float sumTemp = 0.0;
int numReadings = 0;

void setup() {
  // Start the serial communication
  Serial.begin(9600);

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

  // Initialize the OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Halt if display initialization fails
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.display();
}

void loop() {
  // Request temperature from the DS18B20 sensor
  sensors.requestTemperatures();
  currentTemp = sensors.getTempCByIndex(0);

  // Update min and max temperatures
  if (currentTemp < minTemp) {
    minTemp = currentTemp;
  }
  if (currentTemp > maxTemp) {
    maxTemp = currentTemp;
  }

  // Update average temperature
  sumTemp += currentTemp;
  numReadings++;
  float avgTemp = sumTemp / numReadings;

  // Print values to Serial Monitor for debugging
  Serial.print("Current Temperature: ");
  Serial.print(currentTemp);
  Serial.print(" °C, Min: ");
  Serial.print(minTemp);
  Serial.print(" °C, Max: ");
  Serial.print(maxTemp);
  Serial.print(" °C, Avg: ");
  Serial.print(avgTemp);
  Serial.println(" °C");

  // Display values on the OLED
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("Current: " + String(currentTemp, 1) + " C");
  display.println("Min: " + String(minTemp, 1) + " C");
  display.println("Max: " + String(maxTemp, 1) + " C");
  display.println("Avg: " + String(avgTemp, 1) + " C");
  display.display();

  // Wait for a second before the next reading
  delay(1000);
}