BoschBME280 class

The Sensor sub-class for the Bosch BME280.

Base classes

class Sensor: The "Sensor" class is used for all sensor-level operations - waking, sleeping, and taking measurements.

Constructors, destructors, conversion operators

BoschBME280(TwoWire* theI2C, int8_t powerPin, uint8_t i2cAddressHex = 0x76, uint8_t measurementsToAverage = 1): Construct a new Bosch BME280 object using a secondary hardware I2C instance.
BoschBME280(int8_t powerPin, uint8_t i2cAddressHex = 0x76, uint8_t measurementsToAverage = 1) explicit: Construct a new Bosch BME280 object using the primary hardware I2C instance.
~BoschBME280(): Destroy the Bosch BME280 object.

Public functions

bool wake(void) -> bool override: Wake the sensor up, if necessary. Do whatever it takes to get a sensor in the proper state to begin a measurement.
bool setup(void) -> bool override: Do any one-time preparations needed before the sensor will be able to take readings.
String getSensorLocation(void) -> String override: Get the pin or connection location between the mcu and the sensor.
bool addSingleMeasurementResult(void) -> bool override: Get the results from a single measurement.

Function documentation

BoschBME280::BoschBME280(TwoWire* theI2C, int8_t powerPin, uint8_t i2cAddressHex = 0x76, uint8_t measurementsToAverage = 1)

Construct a new Bosch BME280 object using a secondary hardware I2C instance.

Parameters
theI2C	A TwoWire instance for I2C communication. Due to the limitations of the Arduino core, only a hardware I2C instance can be used. For an AVR board, there is only one I2C instance possible and this form of the constructor should not be used. For a SAMD board, this can be used if a secondary I2C port is created on one of the extra SERCOMs.
powerPin	The pin on the mcu controlling power to the BME280 Use -1 if it is continuously powered. The BME280 requires a 1.7 - 3.6V power source
i2cAddressHex	The I2C address of the BME280; must be either 0x76 or 0x77. The default value is 0x76.
measurementsToAverage	The number of measurements to take and average before giving a "final" result from the sensor; optional with a default value of 1.

BoschBME280::BoschBME280(int8_t powerPin, uint8_t i2cAddressHex = 0x76, uint8_t measurementsToAverage = 1) explicit

Construct a new Bosch BME280 object using the primary hardware I2C instance.

Parameters
powerPin	The pin on the mcu controlling power to the BME280 Use -1 if it is continuously powered. The BME280 requires a 1.7 - 3.6V power source
i2cAddressHex	The I2C address of the BME280; must be either 0x76 or 0x77. The default value is 0x76.
measurementsToAverage	The number of measurements to take and average before giving a "final" result from the sensor; optional with a default value of 1.

Parameters

powerPin

The pin on the mcu controlling power to the BME280 Use -1 if it is continuously powered.

The BME280 requires a 1.7 - 3.6V power source

i2cAddressHex

The I2C address of the BME280; must be either 0x76 or 0x77. The default value is 0x76.

measurementsToAverage

The number of measurements to take and average before giving a "final" result from the sensor; optional with a default value of 1.

bool BoschBME280::wake(void) override

Wake the sensor up, if necessary. Do whatever it takes to get a sensor in the proper state to begin a measurement.

Returns	bool True if the wake function completed successfully.

Verifies that the power is on and updates the _sensorStatus. This also sets the _millisSensorActivated timestamp.

bool BoschBME280::setup(void) override

Do any one-time preparations needed before the sensor will be able to take readings.

Returns	bool True if the setup was successful.

This begins the Wire library (sets pin modes for I2C), reads calibration coefficients from the BME280, and updates the _sensorStatus. The BME280 must be powered for setup.

String BoschBME280::getSensorLocation(void) override

Get the pin or connection location between the mcu and the sensor.

Returns	String Text describing how the sensor is attached to the mcu.

bool BoschBME280::addSingleMeasurementResult(void) override

Get the results from a single measurement.

Returns	bool True if the function completed successfully.

This asks the sensor for a new result, verifies that it passes sanity range checks, and then adds the value to the result array.

This also un-sets the _millisMeasurementRequested timestamp (sets _millisMeasurementRequested to 0) and updates the _sensorStatus.