DARKHalf

ZUNO_BMP280.h

Oct 19th, 2016
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  1. /*
  2.     BMP280.h
  3.     Bosch BMP280 pressure sensor library for the Arduino microcontroller.
  4.     This library uses I2C connection.
  5.  
  6.     Uses floating-point equations from BMP280 datasheet.
  7.  
  8.     modified by mhafuzul islam
  9.  
  10.     version 1.01         16/9/2014 initial version
  11.    
  12.     Our example code uses the "pizza-eating" license. You can do anything
  13.     you like with this code. No really, anything. If you find it useful,
  14.     buy me italian pizza someday.
  15. */
  16.  
  17. #ifndef BMP280_h
  18. #define BMP280_h
  19.  
  20. #include "Arduino.h"
  21.  
  22. // #define _debugSerial
  23. // #define _debugTestData
  24.  
  25. class BMP280
  26. {
  27.     public:
  28.         BMP280(); // base type
  29.  
  30.         char begin();
  31.         char begin(int sdaPin, int sclPin);
  32.             // call pressure.begin() to initialize BMP280 before use
  33.             // returns 1 if success, 0 if failure (i2C connection problem.)
  34.                
  35.         short getOversampling(void);
  36.         char  setOversampling(short oss);
  37.        
  38.         char startMeasurment(void);
  39.             // command BMP280 to start a pressure measurement
  40.             // oversampling: 0 - 3 for oversampling value
  41.             // returns (number of ms to wait) for success, 0 for fail
  42.        
  43.         //char calcTemperature(double &T, double &uT);
  44.             // calculation the true temperature from the given uncalibrated Temperature
  45.            
  46.         //char calcPressure(double &P, double uP);
  47.             //calculation for measuring pressure.
  48.            
  49.         double sealevel(double P, double A);
  50.             // convert absolute pressure to sea-level pressure
  51.             // P: absolute pressure (mbar)
  52.             // A: current altitude (meters)
  53.             // returns sealevel pressure in mbar
  54.  
  55.         double altitude(double P, double P0);
  56.             // convert absolute pressure to altitude (given baseline pressure; sea-level, runway, etc.)
  57.             // P: absolute pressure (mbar)
  58.             // P0: fixed baseline pressure (mbar)
  59.             // returns signed altitude in meters
  60.  
  61.         char getError(void);
  62.             // If any library command fails, you can retrieve an extended
  63.             // error code using this command. Errors are from the wire library:
  64.             // 0 = Success
  65.             // 1 = Data too long to fit in transmit buffer
  66.             // 2 = Received NACK on transmit of address
  67.             // 3 = Received NACK on transmit of data
  68.             // 4 = Other error
  69.            
  70.         char getTemperatureAndPressure(double& T,double& P);
  71.  
  72.     private:
  73.    
  74.        
  75.  
  76.         char readInt(char address, double &value);
  77.             // read an signed int (16 bits) from a BMP280 register
  78.             // address: BMP280 register address
  79.             // value: external signed int for returned value (16 bits)
  80.             // returns 1 for success, 0 for fail, with result in value
  81.  
  82.         char readUInt(char address, double &value);
  83.             // read an unsigned int (16 bits) from a BMP280 register
  84.             // address: BMP280 register address
  85.             // value: external unsigned int for returned value (16 bits)
  86.             // returns 1 for success, 0 for fail, with result in value
  87.  
  88.         char readBytes(unsigned char *values, char length);
  89.             // read a number of bytes from a BMP280 register
  90.             // values: array of char with register address in first location [0]
  91.             // length: number of bytes to read back
  92.             // returns 1 for success, 0 for fail, with read bytes in values[] array
  93.            
  94.         char writeBytes(unsigned char *values, char length);
  95.             // write a number of bytes to a BMP280 register (and consecutive subsequent registers)
  96.             // values: array of char with register address in first location [0]
  97.             // length: number of bytes to write
  98.             // returns 1 for success, 0 for fail
  99.        
  100.         //char getUnPT(double &uP, double &uT);
  101.             //get uncalibrated UP and UT value.
  102.            
  103.         char readCalibration();
  104.             // Retrieve calibration data from device:
  105.             // The BMP280 includes factory calibration data stored on the device.
  106.             // Each device has different numbers, these must be retrieved and
  107.             // used in the calculations when taking measurements.
  108.    
  109.                
  110.         //int dig_T2 , dig_T3 , dig_T4 , dig_P2 , dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
  111.         //unsigned int dig_P1 , dig_T1 ;
  112.         double dig_T1, dig_T2 , dig_T3 , dig_T4 , dig_P1, dig_P2 , dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
  113.         short oversampling, oversampling_t;
  114.         double t_fine;
  115.         char error;
  116. };
  117.  
  118. #define BMP280_ADDR 0x76 // 7-bit address
  119.  
  120. #define BMP280_REG_CONTROL 0xF4
  121. #define BMP280_REG_RESULT_PRESSURE 0xF7         // 0xF7(msb) , 0xF8(lsb) , 0xF9(xlsb) : stores the pressure data.
  122. #define BMP280_REG_RESULT_TEMPRERATURE 0xFA     // 0xFA(msb) , 0xFB(lsb) , 0xFC(xlsb) : stores the temperature data.
  123.  
  124. #define BMP280_COMMAND_TEMPERATURE 0x2E
  125. #define BMP280_COMMAND_PRESSURE0 0x25            
  126. #define BMP280_COMMAND_PRESSURE1 0x29          
  127. #define BMP280_COMMAND_PRESSURE2 0x2D    
  128. #define BMP280_COMMAND_PRESSURE3 0x31    
  129. #define BMP280_COMMAND_PRESSURE4 0x5D    
  130.  
  131. #endif
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