#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <MPU6050.h>

// --- OLED Settings ---
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// --- DS18B20 Settings ---
#define ONE_WIRE_BUS 18 // GPIO4 for DS18B20 data pin
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// --- MPU6050 ---
MPU6050 mpu;

void setup() {
  Serial.begin(115200);
  Wire.begin();

  // Initialize OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED not found!");
    while (1);
  }
  display.clearDisplay();

  // Initialize DS18B20
  sensors.begin();

  // Initialize MPU6050
  mpu.initialize();
  if (!mpu.testConnection()) {
    Serial.println("MPU6050 connection failed!");
  }

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  // --- Read Temperature ---
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);

  // --- Read Accelerometer ---
  int16_t ax, ay, az;
  mpu.getAcceleration(&ax, &ay, &az);

  // --- Display on OLED ---
  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("ESP32 Sensor Monitor");
  display.println("--------------------");
  display.print("Temp: ");
  display.print(tempC);
  display.println(" C");

  display.print("AX: "); display.println(ax);
  display.print("AY: "); display.println(ay);
  display.print("AZ: "); display.println(az);
  display.display();

  delay(1000);
}