BMP280.h

00001 /**
00002  *  BME280 Combined humidity and pressure sensor library
00003  *
00004  *  @author  Toyomasa Watarai
00005  *  @version 1.0
00006  *  @date    06-April-2015
00007  *
00008  *  Library for "BME280 temperature, humidity and pressure sensor module" from Switch Science
00009  *    https://www.switch-science.com/catalog/2236/
00010  *
00011  *  For more information about the BME280:
00012  *    http://ae-bst.resource.bosch.com/media/products/dokumente/bme280/BST-BME280_DS001-10.pdf
00013  */
00014  
00015 #ifndef MBED_BMP280_H
00016 #define MBED_BMP280_H
00017 
00018 #include "mbed.h"
00019 
00020 //#define _DEBUG
00021 // default address with SDO High 0x77
00022 // address with SDO LOW 0x76
00023 #define DEFAULT_SLAVE_ADDRESS (0x77)
00024 
00025 #ifdef _DEBUG
00026 extern Serial pc;
00027 #define DEBUG_PRINT(...) pc.printf(__VA_ARGS__)
00028 #else
00029 #define DEBUG_PRINT(...)
00030 #endif
00031 
00032  
00033 /** BME280 class
00034  *
00035  *  BME280: A library to read environmental data using Bosch BME280 device
00036  * Readds temperature and pressure
00037  *
00038  *  BME280 is an environmental sensor
00039  *  @endcode
00040  */
00041  
00042 class BMP280
00043 {
00044 public:
00045 
00046     /** Create a BME280 instance
00047      *  which is connected to specified I2C pins with specified address
00048      *
00049      * @param sda I2C-bus SDA pin
00050      * @param scl I2C-bus SCL pin
00051      * @param slave_adr (option) I2C-bus address (default: 0x77)
00052      */
00053     BMP280(PinName sda, PinName sck, char slave_adr = DEFAULT_SLAVE_ADDRESS);
00054 
00055     /** Create a BME280 instance
00056      *  which is connected to specified I2C pins with specified address
00057      *
00058      * @param i2c_obj I2C object (instance)
00059      * @param slave_adr (option) I2C-bus address (default: 0x77)
00060      */
00061     BMP280(I2C &i2c_obj, char slave_adr = DEFAULT_SLAVE_ADDRESS);
00062 
00063     /** Destructor of BME280
00064      */
00065     virtual ~BMP280();
00066 
00067     /** Initializa BME280 sensor
00068      *
00069      *  Configure sensor setting and read parameters for calibration
00070      *
00071      */
00072     void initialize(void);
00073 
00074     /** Read the current temperature value (degree Celsius) from BME280 sensor
00075      *
00076      */
00077     float getTemperature(void);
00078 
00079     /** Read the current pressure value (hectopascal)from BME280 sensor
00080      *
00081      */
00082     float getPressure(void);
00083 
00084     /** Read the current humidity value (humidity %) from BME280 sensor
00085      *
00086      */
00087   //  float getHumidity(void);
00088 
00089 private:
00090 
00091     I2C         *i2c_p;
00092     I2C         &i2c;
00093     char        address;
00094     uint16_t    dig_T1;
00095     int16_t     dig_T2, dig_T3;
00096     uint16_t    dig_P1;
00097     int16_t     dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
00098     uint16_t    dig_H1, dig_H3;
00099     int16_t     dig_H2, dig_H4, dig_H5, dig_H6;
00100     int32_t     t_fine;
00101 
00102 };
00103 
00104 #endif // MBED_BME280_H