BMPX8X Class Reference

API for the GY65/BMP085 and BMP180 Atmospheric Pressure Sensors. More...

Detailed Description

• ID: bmpx8x
• Name: BMP Atmospheric Pressure Sensor
• Other Names: GY65 BMP085 BMP180 BMP183
• Category: pressure
• Manufacturer: seeed adafruit sparkfun
• Connection: i2c
• Link: https://www.sparkfun.com/datasheets/Components/General/BST-BMP085-DS000-05.pdf
• Link: https://www.bosch-sensortec.com/bst/products/all_products/bmp180
• Link: https://cdn-shop.adafruit.com/datasheets/1900_BMP183.pdf

Bosch GY65/BMP085 and BMP180 are high-precision, ultra-low power consumption pressure sensors. They operate in the range of 30,000-110,000 Pa.

This module has been tested on the GY65/BMP085 and BMP180 sensors.

    uint32_t presure = 0;
    float temperature = 0;
    float altitude = 0;
    uint32_t sealevel = 0;

    // Instantiate a BMPX8X sensor on I2C
    sensor = new upm::BMPX8X(0, ADDR);

    // Print the pressure, altitude, sea level, and
    // temperature values every 0.1 seconds
    while (!doWork) {
        presure = sensor->getPressure ();
        temperature = sensor->getTemperature ();
        altitude = sensor->getAltitude ();
        sealevel = sensor->getSealevelPressure ();

        std::cout << "pressure value = " <<
                    presure <<
                    ", altitude value = " <<
                    altitude <<
                    ", sealevel value = " <<
                    sealevel <<
                    ", temperature = " <<
                    temperature << std::endl;
        usleep (100000);
    }

Public Member Functions
	BMPX8X (int bus, int devAddr=0x77, uint8_t mode=BMP085_ULTRAHIGHRES)
int32_t	getPressure ()
int32_t	getPressureRaw ()
int16_t	getTemperatureRaw ()
float	getTemperature ()
int32_t	getSealevelPressure (float altitudeMeters=0)
float	getAltitude (float sealevelPressure=101325)
int	getTemperatureCelsius ()
int	getPressurePa ()
const char *	getModuleName ()
int32_t	computeB5 (int32_t UT)
uint16_t	i2cReadReg_16 (int reg)
mraa::Result	i2cWriteReg (uint8_t reg, uint8_t value)
uint8_t	i2cReadReg_8 (int reg)

Constructor & Destructor Documentation

BMPX8X	(	int	bus,
		int	devAddr = 0x77,
		uint8_t	mode = BMP085_ULTRAHIGHRES
	)

Instantiates a BMPX8X object

Parameters

bus	Number of the used bus
devAddr	Address of the used I2C device
mode	BMP085 mode

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Member Function Documentation

int32_t getPressure

(

)

BMPX8X object destructor; basically, it closes the I2C connection. ~BMPX8X (); LE: there is no need for the destructor, as the I2C connection will be closed when the m_i2ControlCtx variable will go out of scope (when all the BMPX8X objects will be destroyed) Returns the calculated pressure

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int32_t getPressureRaw

(

)

Gets raw pressure data

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int16_t getTemperatureRaw

(

)

Gets raw temperature data from the sensor

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float getTemperature

(

void

)

Returns the calculated temperature

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int32_t getSealevelPressure

(

float

altitudeMeters = 0

)

With a given absolute altitude, sea level can be calculated

Parameters

altitudeMeters

Altitude

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float getAltitude

(

float

sealevelPressure = 101325

)

With a given sea level, altitude in meters can be calculated

Parameters

sealevelPressure

Sea level

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int getTemperatureCelsius ( )

virtual

Return latest calculated temperature value in Celsius See ITemperatureSensor

Implements ITemperatureSensor.

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int getPressurePa ( )

inlinevirtual

Return latest calculated pressure value in Pascals See IPressureSensor

Implements IPressureSensor.

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const char * getModuleName ( )

virtual

Returns name of module. This is the string in library name after libupm_

Returns

name of module

Implements IModuleStatus.

int32_t computeB5

(

int32_t

UT

)

Calculates B5 (check the spec for more information)

Parameters

UT

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uint16_t i2cReadReg_16

(

int

reg

)

Reads a two-byte register

Parameters

reg	Address of the register

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mraa::Result i2cWriteReg	(	uint8_t	reg,
		uint8_t	value
	)

Writes to a one-byte register

Parameters

reg	Address of the register
value	Byte to be written

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uint8_t i2cReadReg_8

(

int

reg

)

Reads a one-byte register

Parameters

reg	Address of the register

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Inheritance diagram for BMPX8X:

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The documentation for this class was generated from the following files:

• /iotdk/jenkins/workspace/upm-doc-stable/src/bmpx8x/bmpx8x.hpp
• /iotdk/jenkins/workspace/upm-doc-stable/src/bmpx8x/bmpx8x.cxx