Andrew's git - arduino-weather.git/blob - libraries/Adafruit_BMP085_Unified-master/Adafruit_BMP085

   1/***************************************************************************
   2  This is a library for the BMP085 pressure sensor
   3
   4  Designed specifically to work with the Adafruit BMP085 or BMP180 Breakout 
   5  ----> http://www.adafruit.com/products/391
   6  ----> http://www.adafruit.com/products/1603
   7
   8  These displays use I2C to communicate, 2 pins are required to interface.
   9
  10  Adafruit invests time and resources providing this open source code,
  11  please support Adafruit andopen-source hardware by purchasing products
  12  from Adafruit!
  13
  14  Written by Kevin Townsend for Adafruit Industries.  
  15  BSD license, all text above must be included in any redistribution
  16 ***************************************************************************/
  17#ifndef __BMP085_H__
  18#define __BMP085_H__
  19
  20#if (ARDUINO >= 100)
  21 #include "Arduino.h"
  22#else
  23 #include "WProgram.h"
  24#endif
  25
  26#include <Adafruit_Sensor.h>
  27
  28#ifdef __AVR_ATtiny85__
  29 #include "TinyWireM.h"
  30 #define Wire TinyWireM
  31#else
  32 #include <Wire.h>
  33#endif
  34
  35/*=========================================================================
  36    I2C ADDRESS/BITS
  37    -----------------------------------------------------------------------*/
  38    #define BMP085_ADDRESS                (0x77)
  39/*=========================================================================*/
  40
  41/*=========================================================================
  42    REGISTERS
  43    -----------------------------------------------------------------------*/
  44    enum
  45    {
  46      BMP085_REGISTER_CAL_AC1            = 0xAA,  // R   Calibration data (16 bits)
  47      BMP085_REGISTER_CAL_AC2            = 0xAC,  // R   Calibration data (16 bits)
  48      BMP085_REGISTER_CAL_AC3            = 0xAE,  // R   Calibration data (16 bits)
  49      BMP085_REGISTER_CAL_AC4            = 0xB0,  // R   Calibration data (16 bits)
  50      BMP085_REGISTER_CAL_AC5            = 0xB2,  // R   Calibration data (16 bits)
  51      BMP085_REGISTER_CAL_AC6            = 0xB4,  // R   Calibration data (16 bits)
  52      BMP085_REGISTER_CAL_B1             = 0xB6,  // R   Calibration data (16 bits)
  53      BMP085_REGISTER_CAL_B2             = 0xB8,  // R   Calibration data (16 bits)
  54      BMP085_REGISTER_CAL_MB             = 0xBA,  // R   Calibration data (16 bits)
  55      BMP085_REGISTER_CAL_MC             = 0xBC,  // R   Calibration data (16 bits)
  56      BMP085_REGISTER_CAL_MD             = 0xBE,  // R   Calibration data (16 bits)
  57      BMP085_REGISTER_CHIPID             = 0xD0,
  58      BMP085_REGISTER_VERSION            = 0xD1,
  59      BMP085_REGISTER_SOFTRESET          = 0xE0,
  60      BMP085_REGISTER_CONTROL            = 0xF4,
  61      BMP085_REGISTER_TEMPDATA           = 0xF6,
  62      BMP085_REGISTER_PRESSUREDATA       = 0xF6,
  63      BMP085_REGISTER_READTEMPCMD        = 0x2E,
  64      BMP085_REGISTER_READPRESSURECMD    = 0x34
  65    };
  66/*=========================================================================*/
  67
  68/*=========================================================================
  69    MODE SETTINGS
  70    -----------------------------------------------------------------------*/
  71    typedef enum
  72    {
  73      BMP085_MODE_ULTRALOWPOWER          = 0,
  74      BMP085_MODE_STANDARD               = 1,
  75      BMP085_MODE_HIGHRES                = 2,
  76      BMP085_MODE_ULTRAHIGHRES           = 3
  77    } bmp085_mode_t;
  78/*=========================================================================*/
  79
  80/*=========================================================================
  81    CALIBRATION DATA
  82    -----------------------------------------------------------------------*/
  83    typedef struct
  84    {
  85      int16_t  ac1;
  86      int16_t  ac2;
  87      int16_t  ac3;
  88      uint16_t ac4;
  89      uint16_t ac5;
  90      uint16_t ac6;
  91      int16_t  b1;
  92      int16_t  b2;
  93      int16_t  mb;
  94      int16_t  mc;
  95      int16_t  md;
  96    } bmp085_calib_data;
  97/*=========================================================================*/
  98
  99class Adafruit_BMP085_Unified : public Adafruit_Sensor
 100{
 101  public:
 102    Adafruit_BMP085_Unified(int32_t sensorID = -1);
 103  
 104    bool  begin(bmp085_mode_t mode = BMP085_MODE_ULTRAHIGHRES);
 105    void  getTemperature(float *temp);
 106    void  getPressure(float *pressure);
 107    float pressureToAltitude(float seaLvel, float atmospheric);
 108    float seaLevelForAltitude(float altitude, float atmospheric);
 109    // Note that the next two functions are just for compatibility with old
 110    // code that passed the temperature as a third parameter.  A newer
 111    // calculation is used which does not need temperature.
 112    float pressureToAltitude(float seaLevel, float atmospheric, float temp);
 113    float seaLevelForAltitude(float altitude, float atmospheric, float temp);
 114    bool  getEvent(sensors_event_t*);
 115    void  getSensor(sensor_t*);
 116
 117  private:
 118    int32_t computeB5(int32_t ut);
 119    int32_t _sensorID;
 120};
 121
 122#endif