ESP32 BMP085 Barometric Pressure Sensor

Code Examples

Below you can find code examples of BMP085 Barometric Pressure Sensor with ESP32 in several frameworks:

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

ESP32 BMP085 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the BMP085 Barometric Pressure Sensor:

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>

Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);

void setup() {
  Serial.begin(115200);
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
    while (1);
  }
}

void loop() {
  sensors_event_t event;
  bmp.getEvent(&event);
  if (event.pressure) {
    Serial.print("Pressure: ");
    Serial.print(event.pressure);
    Serial.println(" hPa");
  }
  float temperature;
  bmp.getTemperature(&temperature);
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");
  delay(2000);
}

This Arduino code initializes the BMP085 sensor using the Adafruit_BMP085_Unified library. In the loop() function, the code reads and prints atmospheric pressure and temperature values every two seconds. The sensor's event-based API ensures efficient data handling.

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 BMP085 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the BMP085 Barometric Pressure 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 "bmp085.h"
#include "esp_log.h"

#define I2C_MASTER_SCL_IO 22
#define I2C_MASTER_SDA_IO 21
#define I2C_MASTER_FREQ_HZ 100000
#define BMP085_ADDR 0x77

static const char *TAG = "BMP085";

void app_main() {
    ESP_LOGI(TAG, "Initializing BMP085...");

    bmp085_dev dev;
    bmp085_init(&dev, I2C_MASTER_SCL_IO, I2C_MASTER_SDA_IO, I2C_MASTER_FREQ_HZ, BMP085_ADDR);

    while (1) {
        bmp085_data data;
        bmp085_read(&dev, &data);
        ESP_LOGI(TAG, "Temperature: %.2f°C", data.temperature);
        ESP_LOGI(TAG, "Pressure: %.2f hPa", data.pressure);
        vTaskDelay(2000 / portTICK_PERIOD_MS);
    }
}

This ESP-IDF code configures the ESP32 to interface with the BMP085 sensor over I2C. The bmp085_init function initializes the sensor, while the bmp085_read function fetches pressure and temperature readings, which are logged 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 BMP085 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the BMP085 Barometric Pressure Sensor

sensor:
  - platform: bmp085
    temperature:
      name: "BMP085 Temperature"
    pressure:
      name: "BMP085 Pressure"
    address: 0x77

This ESPHome configuration integrates the BMP085 sensor. It creates sensor entities for temperature and pressure, which are monitored via the I2C address 0x77. The setup is ideal for weather monitoring and IoT systems.

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

ESP32 BMP085 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 BMP085 Unified Library
    wire
monitor_speed = 115200

ESP32 BMP085 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the BMP085 Barometric Pressure Sensor:

#include <Wire.h>
#include "Adafruit_BMP085.h"

Adafruit_BMP085 bmp;

void setup() {
  Serial.begin(115200);
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP085 sensor, check wiring!");
    while (1);
  }
}

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

  Serial.print("Pressure: ");
  Serial.print(bmp.readPressure() / 100.0);
  Serial.println(" hPa");
  delay(2000);
}

This PlatformIO code integrates the Adafruit BMP085 library to read temperature and pressure values. The data is fetched and printed to the Serial Monitor every two seconds using simple function calls.

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

ESP32 BMP085 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the BMP085 Barometric Pressure Sensor with your ESP32.

from machine import I2C, Pin
from bmp085 import BMP085

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

# Initialize BMP085
bmp = BMP085(i2c)

while True:
    print(f"Temperature: {bmp.temperature:.2f} °C")
    print(f"Pressure: {bmp.pressure / 100:.2f} hPa")
    sleep(2)

This MicroPython code initializes the BMP085 sensor using I2C. The sensor reads and prints temperature and pressure values to the console every two seconds. It uses the BMP085 MicroPython library for easy integration.

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