A library to read BME280 sensor with error detection

Fork of BME280 by Toyomasa Watarai



File content as of revision 6:2f87adc3e6b7:

 *  BME280 Combined humidity and pressure sensor library
 *  @author  Toyomasa Watarai
 *  @version 1.0
 *  @date    06-April-2015
 *  Library for "BME280 temperature, humidity and pressure sensor module" from Switch Science
 *    https://www.switch-science.com/catalog/2236/
 *  For more information about the BME280:
 *    http://ae-bst.resource.bosch.com/media/products/dokumente/bme280/BST-BME280_DS001-10.pdf
#ifndef MBED_BME280_H
#define MBED_BME280_H

#include "mbed.h"

//#define _DEBUG
#define DEFAULT_SLAVE_ADDRESS (0x76 << 1)

#ifdef _DEBUG
extern Serial pc;
#define DEBUG_PRINT(...) pc.printf(__VA_ARGS__)
#define DEBUG_PRINT(...)

/** BME280 class
 *  BME280: A library to correct environmental data using Boshe BME280 device
 *  BME280 is an environmental sensor
 *  @endcode
class BME280

    /** Create a BME280 instance
     *  which is connected to specified I2C pins with specified address
     * @param sda I2C-bus SDA pin
     * @param scl I2C-bus SCL pin
     * @param slave_adr (option) I2C-bus address (default: 0x76)
    BME280(PinName sda, PinName sck, char slave_adr = DEFAULT_SLAVE_ADDRESS);

    /** Create a BME280 instance
     *  which is connected to specified I2C pins with specified address
     * @param i2c_obj I2C object (instance)
     * @param slave_adr (option) I2C-bus address (default: 0x76)
    BME280(I2C &i2c_obj, char slave_adr = DEFAULT_SLAVE_ADDRESS);

    /** Destructor of BME280
    virtual ~BME280();

    /** Initializa BME280 sensor
     *  Configure sensor setting and read parameters for calibration
    void initialize(void);

    /** Read the current temperature value (degree Celsius) from BME280 sensor
    float getTemperature(void);

    /** Read the current pressure value (hectopascal)from BME280 sensor
    float getPressure(void);

    /** Read the current humidity value (humidity %) from BME280 sensor
    float getHumidity(void);


    I2C         *i2c_p;
    I2C         &i2c;
    char        address;
    uint16_t    dig_T1;
    int16_t     dig_T2, dig_T3;
    uint16_t    dig_P1;
    int16_t     dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
    uint16_t    dig_H1, dig_H3;
    int16_t     dig_H2, dig_H4, dig_H5, dig_H6;
    int32_t     t_fine;


#endif // MBED_BME280_H