4927b2e04f
Bosch Sensortronic's BME680 is a brand new integrated environmental sensor. It integrates temperature, pressure, humidity and gas sensors with high accuracy within a single unit. These are the examples on how to use the new driver for BME680.
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/**
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* Simple example with one sensor connected to I2C bus 0
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* using BME680 driver and a timer to poll the results.
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*
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* Harware configuration:
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*
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* ESP8266 BME680
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* GPIO 5 (SCL) -> SCL
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* GPIO 4 (SDA) -- SDA
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*/
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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#include "i2c/i2c.h"
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#include "timers.h"
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// include BME680 driver
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#include "bme680/bme680_drv.h"
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// define I2C interfaces at which BME680 sensors can be connected
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#define I2C_BUS 0
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#define I2C_SCL_PIN GPIO_ID_PIN((5))
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#define I2C_SDA_PIN GPIO_ID_PIN((4))
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#define BME680_ADDR1 0x76
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#define BME680_ADDR2 0x77 // default
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static TimerHandle_t timerHandle;
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static uint32_t sensor;
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/**
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* Timer callback function that executes function bme680_get_values to get last
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* actual and average sensor values for given sensor.
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*/
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static void my_sensor_timer_cb(TimerHandle_t xTimer)
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{
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bme680_value_set_t actual;
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bme680_value_set_t average;
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bme680_get_values(sensor, &actual, &average);
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printf("%.3f Sensor %d: %.2f (%.2f) C, %.2f (%.2f) Percent, %.2f (%.2f) hPa, %.2f (%.2f) Ohm\n",
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(double)sdk_system_get_time()*1e-3, sensor,
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actual.temperature, average.temperature,
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actual.humidity, average.humidity,
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actual.pressure, average.pressure,
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actual.gas, average.gas);
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}
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void user_init(void)
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{
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// Set UART Parameter
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uart_set_baud(0, 115200);
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// Give the UART some time to settle
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sdk_os_delay_us(500);
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/** Please note:
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* Function *bme680_create_sensor* returns a value greater or equal 0
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* on succes, all other *bme680_* functions return true on success. Using
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* these return values, you could realize an error handling. Error
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* handling is not realized in this example due to readability reasons.
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*/
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/** -- MANDATORY PART -- */
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// Init all I2C bus interfaces at which BME680 sensors are connected
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i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
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// Init BME680 driver itself.
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bme680_init_driver();
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// Create the sensor with slave address 0x77 (BME680_ADDR2) connected to
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// I2C bus 0 (I2C_BUS_1). Parameter *cs* is ignored in case of I2C.
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sensor = bme680_create_sensor (I2C_BUS, BME680_ADDR2, 0);
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// Create and start a timer that calls my_sensor_timer_cb every 1000 ms
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// Timer value has to be equal or greater than the period of measurment
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// task above
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if ((timerHandle = xTimerCreate("BME680 Trigger", 1000/portTICK_PERIOD_MS,
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pdTRUE, NULL, my_sensor_timer_cb)))
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xTimerStart(timerHandle, 0);
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// That's it.
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/** -- OPTIONAL PART -- */
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// Change the period of measurements (default 1000 ms) to 500 ms.
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bme680_set_measurement_period (sensor, 500);
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// Changes the oversampling rates (default os_1x) to 4x oversampling for
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// temperature and 2x oversampling for pressure. Humidity measurement is
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// skipped.
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bme680_set_oversampling_rates(sensor, os_4x, os_2x, none);
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// Change the IIR filter size (default iir_size_3) for temperature and
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// and pressure to 7.
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bme680_set_filter_size(sensor, iir_size_7);
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// Change the heaeter profile (default 320 degree Celcius for 150 ms) to
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// 200 degree Celcius for 100 ms.
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bme680_set_heater_profile (sensor, 200, 100);
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}
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