ESP32 BMP280 Barometric Pressure and Temperature Sensor

Code Examples

Below you can find code examples of BMP280 Barometric Pressure and Temperature Sensor with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

ESP32 BMP280 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the BMP280 Barometric Pressure and Temperature Sensor:

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

Adafruit_BMP280 bmp;

void setup() {
  Serial.begin(115200);
  if (!bmp.begin(0x76)) {
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
}

void loop() {
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" *C");

  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure() / 100.0F);
  Serial.println(" hPa");

  delay(2000);
}

This Arduino code initializes the BMP280 sensor using the Adafruit BMP280 library. It reads temperature and pressure values and prints them to the Serial Monitor every two seconds. Ensure the I²C address (0x76 or 0x77) matches your sensor's configuration.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 BMP280 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the BMP280 Barometric Pressure and Temperature Sensor, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

#include <stdio.h>
#include "driver/i2c.h"
#include "esp_log.h"

#define I2C_MASTER_NUM I2C_NUM_0
#define I2C_MASTER_SDA_IO 21
#define I2C_MASTER_SCL_IO 22
#define I2C_MASTER_FREQ_HZ 100000
#define BMP280_ADDR 0x76

static const char *TAG = "BMP280";

void i2c_master_init() {
    i2c_config_t conf = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .sda_pullup_en = GPIO_PULLUP_ENABLE,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .scl_pullup_en = GPIO_PULLUP_ENABLE,
        .master.clk_speed = I2C_MASTER_FREQ_HZ,
    };
    i2c_param_config(I2C_MASTER_NUM, &conf);
    i2c_driver_install(I2C_MASTER_NUM, conf.mode, 0, 0, 0);
}

void bmp280_read_data() {
    uint8_t reg = 0xF7; // BMP280 data register
    uint8_t data[6];
    i2c_master_write_read_device(I2C_MASTER_NUM, BMP280_ADDR, &reg, 1, data, 6, 1000 / portTICK_RATE_MS);

    // Process raw data
    int32_t adc_pressure = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
    int32_t adc_temperature = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);

    // Use calibration data and formulas from BMP280 datasheet to calculate actual values
    // (calibration data reading not included in this snippet)

    float temperature = ...; // Calculated temperature
    float pressure = ...; // Calculated pressure

    ESP_LOGI(TAG, "Temperature: %.2f °C", temperature);
    ESP_LOGI(TAG, "Pressure: %.2f hPa", pressure);
}

void app_main() {
    ESP_LOGI(TAG, "Initializing I2C...");
    i2c_master_init();

    ESP_LOGI(TAG, "Reading BMP280 data...");
    while (1) {
        bmp280_read_data();
        vTaskDelay(2000 / portTICK_PERIOD_MS);
    }
}

This ESP-IDF code initializes the BMP280 sensor on an ESP32 via I2C. The i2c_master_init() function configures the I2C interface. The bmp280_read_data() function reads raw data from the BMP280 registers and processes it into temperature and pressure values using calibration data and formulas. The main application loop continuously reads and logs the sensor data to the console every two seconds.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 BMP280 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the BMP280 Barometric Pressure and Temperature Sensor

sensor:
  - platform: bmp280
    temperature:
      name: "BMP280 Temperature"
    pressure:
      name: "BMP280 Pressure"
    address: 0x76

This ESPHome configuration integrates the BMP280 sensor. It creates sensor entities for temperature and pressure, which are monitored via the I2C address 0x76. The configuration is ideal for home automation and IoT systems, enabling real-time environmental monitoring.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 BMP280 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = 
    adafruit/Adafruit BMP280 Library
    wire
monitor_speed = 115200

ESP32 BMP280 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the BMP280 Barometric Pressure and Temperature Sensor:

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

Adafruit_BMP280 bmp;

void setup() {
  Serial.begin(115200);
  if (!bmp.begin(0x76)) {
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }
}

void loop() {
  Serial.print("Temperature = ");
  Serial.print(bmp.readTemperature());
  Serial.println(" *C");

  Serial.print("Pressure = ");
  Serial.print(bmp.readPressure() / 100.0F);
  Serial.println(" hPa");

  delay(2000);
}

This PlatformIO code uses the Adafruit BMP280 library to interface with the BMP280 sensor. It reads and prints temperature and pressure values to the Serial Monitor every two seconds. Ensure the I²C address (0x76 or 0x77) is correctly set for your module.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 BMP280 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the BMP280 Barometric Pressure and Temperature Sensor with your ESP32.

from machine import I2C, Pin
from bmp280 import BMP280

# Initialize I2C
i2c = I2C(0, scl=Pin(22), sda=Pin(21))

# Initialize BMP280
bmp = BMP280(i2c)

while True:
    print(f"Temperature: {bmp.temperature:.2f} °C")
    print(f"Pressure: {bmp.pressure:.2f} hPa")
    sleep(2)

This MicroPython code interfaces with the BMP280 sensor via I2C. It reads and prints temperature and pressure data every two seconds. The BMP280 MicroPython library simplifies the integration, allowing straightforward access to sensor readings.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.