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51 lines
1.7 KiB
Markdown
51 lines
1.7 KiB
Markdown
# Component: BME280
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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.
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## Add component to your project
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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
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```
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idf.py add-dependency "espressif/bme280=*"
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```
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## Example of BME280 usage
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Pin assignment:
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* master:
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* GPIO2 is assigned as the clock signal of i2c master port
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* GPIO1 is assigned as the data signal of i2c master port
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* Connection:
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* connect sda of sensor with GPIO1
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* connect scl of sensor with GPIO2
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```c
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static i2c_bus_handle_t i2c_bus = NULL;
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static bme280_handle_t bme280 = NULL;
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//Step1: Init I2C bus
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i2c_config_t conf = {
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.mode = I2C_MODE_MASTER,
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.sda_io_num = I2C_MASTER_SDA_IO,
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.sda_pullup_en = GPIO_PULLUP_ENABLE,
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.scl_io_num = I2C_MASTER_SCL_IO,
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.scl_pullup_en = GPIO_PULLUP_ENABLE,
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.master.clk_speed = I2C_MASTER_FREQ_HZ,
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};
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i2c_bus = i2c_bus_create(I2C_MASTER_NUM, &conf);
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//Step2: Init bme280
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bme280 = bme280_create(i2c_bus, BME280_I2C_ADDRESS_DEFAULT);
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bme280_default_init(bme280);
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//Step3: Read temperature, humidity and pressure
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float temperature = 0.0, humidity = 0.0, pressure = 0.0;
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bme280_read_temperature(bme280, &temperature);
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bme280_read_humidity(bme280, &humidity);
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bme280_read_pressure(bme280, &pressure);
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``` |