BMP280 (1)

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

#define BMP_SCK 5
#define BMP_MISO 12
#define BMP_MOSI 11
#define BMP_CS 4

float alti; //
float n; //added up first ten height measurements
float forecast; //change according to local weather
float approx;
float highest;


Adafruit_BMP280 bme; // I2C

void setup() {
  n = 0;
  forecast = 1012;
  highest = 0;
  Serial.begin(9600);
  Serial.println(F("REBOOT"));
  Serial.println(F("\nBMP280 test\n"));

  if (!bme.begin()) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring!"));
    while (1);
  }
  for(int s=1; s<=10; s++){
        n+=bme.readAltitude(forecast);
        Serial.print(F("Temperature = "));
        Serial.print(bme.readTemperature());
        Serial.println(" *C");

        Serial.print(F("Pressure = "));
        Serial.print(bme.readPressure());
        Serial.print(" Pa");
        Serial.print(" == ");
        Serial.print(bme.readPressure()/100000);
        Serial.println(" bar" );

        Serial.print(F("Approx altitude = "));
        Serial.print(bme.readAltitude(forecast)); // this should be adjusted to your local forcase
        Serial.println(" m");
        Serial.println("calibrating sensor...\n\n");
        delay(500);
  }
  Serial.println("\n\nCALIBRATION COMPLETE\n");
  Serial.print("ALTITUDE AT START:  ");
  Serial.print(n/10);
  Serial.println(" m \n\n\n\n");
  delay(1000);
}

void loop() {
      approx=0;   //reset change
      for(int i=1; i<=5; i++){
        alti=bme.readAltitude(forecast)-(n/10);  //measure height difference 5 times
        approx+= alti;
        delay(200);
      }
      Serial.print(F("Approx altitude:            "));
      Serial.print(bme.readAltitude(forecast));
      Serial.println(" m");

      Serial.print("Approx height difference:   ");
      Serial.print(approx/5);                         //serial out average height difference
      Serial.println(" m");

      if(approx/5>highest){                           //compare heights and store highest value
        highest = approx/5;
        Serial.print("rekord altitude:            ");
        Serial.print(highest+n/10);
        Serial.println(" m");
        Serial.print("\nNEW REKORD ALTITUDE:        ");
        Serial.print(highest);
        Serial.println(" m    NEW REKORD!");
      }else{
        Serial.print("rekord difference:          ");
        Serial.print(highest);
        Serial.println(" m");

      }
    Serial.println();
}