#include <GxEPD2_BW.h>    // GxEPD2 library for black/white displays
#include <DHT.h>          // DHT sensor library
#include <Adafruit_GFX.h> // Graphics library required by GxEPD2

// Pin definitions for 2.9-inch e-Paper (adjust as needed)
#define EPD_CS    10    // Chip Select
#define EPD_DC    9     // Data/Command
#define EPD_RST   8     // Reset
#define EPD_BUSY  7     // Busy

// DHT22 configuration
#define DHTPIN    2     // DHT22 data pin
#define DHTTYPE   DHT22 // Sensor type

// Initialize e-Paper display (GxEPD2_290 is for 2.9" 296x128 BW display)
GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(EPD_CS, EPD_DC, EPD_RST, EPD_BUSY));

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Start serial communication
  Serial.begin(9600);
  
  // Initialize DHT sensor
  dht.begin();
  
  // Initialize e-Paper display
  display.init(115200); // Serial baud rate for debug, can be omitted
  display.setRotation(1); // Adjust rotation: 0-3 (1 = landscape)
  display.setTextColor(GxEPD_BLACK);
  display.setTextSize(2);
  display.setFullWindow(); // Set full refresh mode
}

void loop() {
  // Read temperature and humidity
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  
  // Check if readings are valid
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  // Clear display buffer
  display.fillScreen(GxEPD_WHITE);
  
  // Display temperature
  display.setCursor(10, 20);
  display.print("Temp: ");
  display.print(temperature);
  display.print(" C");
  
  // Display humidity
  display.setCursor(10, 50);
  display.print("Hum: ");
  display.print(humidity);
  display.print(" %");
  
  // Update display
  display.display(); // Full refresh
  
  // Print to serial monitor for debugging
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  
  // Wait 10 seconds before next reading
  delay(10000);
}