bme280test.ino

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define SEALEVELPRESSURE_HPA (1013.25)

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display
Adafruit_BME280 bme; // I2C


void setup()
{
  lcd.init();                      // initialize the lcd 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Hello, world!");
  
  Serial.begin(9600);
  Serial.println(F("BME280 test"));

  if (!bme.begin()) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }
}

void loop()
{
  /*
  lcd.setCursor(0,1);
  lcd.print("Count:" + String(cnt++));
  */

    lcd.setCursor(0,0);
    lcd.print(String(bme.readTemperature()) + "\xef" + "C  ");
    lcd.print(String(bme.readHumidity()) + "%   ");
    lcd.setCursor(0,1);
    lcd.print(String(bme.readPressure()*0.00750062F) + " mmH   ");

    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" *C");

    Serial.print("Pressure = ");

    Serial.print(bme.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println(" m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
    delay(1000);
}