#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

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

// DHT22 config
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Pulse Sensor config
#define PULSE_PIN 34

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

  // OLED setup
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("OLED init failed"));
    while (true);
  }

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

void loop() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int pulse = analogRead(PULSE_PIN);

  display.clearDisplay();
  display.setCursor(0, 0);
  display.println("ESP32 Health Monitor");
  display.print("Temp: ");
  display.print(temp);
  display.println(" C");

  display.print("Humidity: ");
  display.print(hum);
  display.println(" %");

  display.print("Pulse: ");
  display.println(pulse);

  display.display();
  delay(1000);
}