/***
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
***/

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>



#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define BMP_SCK  (18)
#define BMP_MISO (19)
#define BMP_MOSI (23)
#define BMP_CS   (5)

Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


void setup() {
  Serial.begin(9600);
  while ( !Serial ) delay(100);   // wait for native usb

  Serial.println(F("BMP280 test"));
    unsigned status;
  status = bmp.begin();
if (!status) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
                      "try a different address!"));
    Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
    Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
    Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
    Serial.print("        ID of 0x60 represents a BME 280.\n");
    Serial.print("        ID of 0x61 represents a BME 680.\n");
    while (1) delay(10);
  }

  /* Default settings from datasheet. */
  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
}

void loop() {

  if (isnan(h) || isnan(t)) {     // isnan Funktion --> variable IS Not A Number
    Serial.println("DHT Sensor konnte nicht kerrekt gelesen werden!");

  }
  delay(1000);
  display.clearDisplay();
  
    Serial.print(F("Temperature = "));
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");

    Serial.print(F("Pressure = "));
    Serial.print(bmp.readPressure());
    Serial.println(" Pa");

    Serial.print(F("Approx altitude= "));
    Serial.print(bmp.readAltitude(1011.9));
    Serial.println(" m");



  // Anzeige der Temperatur auf dem Display
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("Temperature: ");
  display.setTextSize(2);
  display.setCursor(0,10);
  display.print(bmp.readTemperature());
  display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(2);
  display.print("C");
  
  // Anzeige des Luftdrucks auf dem Display
  display.setTextSize(1);
  display.setCursor(0, 35);
  display.print("Luftdruck: ");
  display.setTextSize(2);
  display.setCursor(0, 45);
  display.print(bmp.readPressure());
  display.print(" Pa"); 
  
/*
    Serial.print(F("Approx altitude = "));
    Serial.print(bmp.readAltitude(1013.25)); 
    Serial.println(" m");*/


  display.display(); 
}