ESP-Nodes/ESP32-IDF_Temperture-Node-v2/managed_components/espressif__bme280

Component: BME280

The BME280 is as combined digital humidity, pressure and temperature sensor based on proven sensing principles. The sensor module is housed in an extremely compact metal-lid LGA package with a footprint of only 2.5 × 2.5 mm² with a height of 0.93 mm. Its small dimensions and its low power consumption allow the implementation in battery driven devices such as handsets, GPS modules or watches.

Add component to your project

Please use the component manager command add-dependency to add the bme280 to your project's dependency, during the CMake step the component will be downloaded automatically

idf.py add-dependency "espressif/bme280=*"

Example of BME280 usage

Pin assignment:

• master:
  • GPIO2 is assigned as the clock signal of i2c master port
  • GPIO1 is assigned as the data signal of i2c master port
• Connection:
  • connect sda of sensor with GPIO1
  • connect scl of sensor with GPIO2

static i2c_bus_handle_t i2c_bus = NULL;
static bme280_handle_t bme280 = NULL;

//Step1: Init I2C bus
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_bus = i2c_bus_create(I2C_MASTER_NUM, &conf);

//Step2: Init bme280
bme280 = bme280_create(i2c_bus, BME280_I2C_ADDRESS_DEFAULT);
bme280_default_init(bme280);

//Step3: Read temperature, humidity and pressure
float temperature = 0.0, humidity = 0.0, pressure = 0.0;
bme280_read_temperature(bme280, &temperature);
bme280_read_humidity(bme280, &humidity);
bme280_read_pressure(bme280, &pressure);