#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "DHT.h"

// Define pins for the sensors
#define DHTPIN 4        // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22 (AM2302)
#define ONE_WIRE_BUS 5  // Pin where the DS18B20 is connected

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

// Initialize BMP280 sensor
Adafruit_BMP280 bmp; // I2C

// Initialize OneWire instance for DS18B20
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(115200);
  
  // Start DHT sensor
  dht.begin();

  // Start DS18B20 sensor
  sensors.begin();
  
  // Start BMP280 sensor
  if (!bmp.begin(0x76)) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or try a different address!"));
    while (1);
  }

  // Print sensor initialization message
  Serial.println(F("DHT22, DS18B20, and BMP280 sensors initialized."));
}

void loop() {
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Read temperature from DS18B20
  sensors.requestTemperatures();
  float tempC_DS18B20 = sensors.getTempCByIndex(0);

  // Read temperature, pressure, and altitude from BMP280
  float tempC_BMP280 = bmp.readTemperature();
  float pressure = bmp.readPressure();
  float altitude = bmp.readAltitude(1013.25); // Adjust the sea level pressure as necessary

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.print(F("°F"));

  Serial.print(F("  DS18B20 Temperature: "));
  Serial.print(tempC_DS18B20);
  Serial.print(F("°C"));

  Serial.print(F("  BMP280 Temperature: "));
  Serial.print(tempC_BMP280);
  Serial.print(F("°C  Pressure: "));
  Serial.print(pressure);
  Serial.print(F("Pa  Altitude: "));
  Serial.print(altitude);
  Serial.println(F("m"));

  // Wait a few seconds between measurements.
  delay(2000);
}