ESP32 BMP280

This is an example of the BMP280 reading and displaying on screen.

There is no necessary prequisits, the wire library will be pulled in automatically.

#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_LiquidCrystal.h>
#include <Adafruit_BMP280.h>

/* BMP280 */
Adafruit_BMP280 bmp; // I2C

#define SDA_PIN 17
#define SCL_PIN 16

#define LCD_RS 48
#define LCD_ENABLE 47
#define LCD_D4 34
#define LCD_D5 33
#define LCD_D6 26
#define LCD_D7 21

static Adafruit_LiquidCrystal lcd(LCD_RS, LCD_ENABLE, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

void setup() {
  Serial.begin(152000);

  // Initialize I2C on custom pins
  Wire.begin(SDA_PIN, SCL_PIN);

  // Initialize LCD
  if (!lcd.begin(16, 2)) {
    Serial.println("Could not init LCD");
    while (1);
  }
  Serial.println("LCD ready.");
  lcd.print("IOT-OPEN");

  // Initialize BMP280 with custom I2C (Wire) instance
  if (!bmp.begin(0x76)) {
    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or address!"));
    while (1) delay(10);
  }

  bmp.setSampling(Adafruit_BMP280::MODE_FORCED,
                  Adafruit_BMP280::SAMPLING_X2,
                  Adafruit_BMP280::SAMPLING_X16,
                  Adafruit_BMP280::FILTER_X16,
                  Adafruit_BMP280::STANDBY_MS_500);
}

void loop() {
  float h = bmp.readPressure();
  float t = bmp.readTemperature();

  if (bmp.takeForcedMeasurement()) {
    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(1013.25)); // Adjust to local forecast
    Serial.println(" m");
  }

  lcd.setCursor(0, 0);
  lcd.print("P: ");
  lcd.print(h / 100.0); // Convert Pa to hPa
  lcd.print("hPa");

  lcd.setCursor(0, 1);
  lcd.print("T: ");
  lcd.print(t);
  lcd.print("C");

  delay(1000);
}

}