1 | /***************************************************************************
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2 | This is a library for the BME280 humidity, temperature & pressure sensor
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3 |
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4 | Designed specifically to work with the Adafruit BME280 Breakout
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5 | ----> http://www.adafruit.com/products/2650
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6 |
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7 | These sensors use I2C or SPI to communicate, 2 or 4 pins are required
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8 | to interface.
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9 |
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10 | Adafruit invests time and resources providing this open source code,
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11 | please support Adafruit andopen-source hardware by purchasing products
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12 | from Adafruit!
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13 |
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14 | Written by Limor Fried & Kevin Townsend for Adafruit Industries.
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15 | BSD license, all text above must be included in any redistribution
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16 |
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17 |
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18 | ***************************************************************************/
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19 | #ifndef __BME280_H__
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20 | #define __BME280_H__
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21 |
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22 | #if (ARDUINO >= 100)
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23 | #include "Arduino.h"
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24 | #else
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25 | #include "WProgram.h"
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26 | #endif
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27 |
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28 | #include <Wire.h>
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29 |
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30 | /*=========================================================================
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31 | I2C ADDRESS/BITS
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32 | -----------------------------------------------------------------------*/
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33 | #define BME280_ADDRESS (0x77)
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34 | /*=========================================================================*/
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35 |
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36 | /*=========================================================================
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37 | REGISTERS
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38 | -----------------------------------------------------------------------*/
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39 | enum
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40 | {
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41 | BME280_REGISTER_DIG_T1 = 0x88,
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42 | BME280_REGISTER_DIG_T2 = 0x8A,
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43 | BME280_REGISTER_DIG_T3 = 0x8C,
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44 |
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45 | BME280_REGISTER_DIG_P1 = 0x8E,
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46 | BME280_REGISTER_DIG_P2 = 0x90,
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47 | BME280_REGISTER_DIG_P3 = 0x92,
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48 | BME280_REGISTER_DIG_P4 = 0x94,
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49 | BME280_REGISTER_DIG_P5 = 0x96,
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50 | BME280_REGISTER_DIG_P6 = 0x98,
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51 | BME280_REGISTER_DIG_P7 = 0x9A,
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52 | BME280_REGISTER_DIG_P8 = 0x9C,
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53 | BME280_REGISTER_DIG_P9 = 0x9E,
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54 |
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55 | BME280_REGISTER_DIG_H1 = 0xA1,
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56 | BME280_REGISTER_DIG_H2 = 0xE1,
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57 | BME280_REGISTER_DIG_H3 = 0xE3,
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58 | BME280_REGISTER_DIG_H4 = 0xE4,
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59 | BME280_REGISTER_DIG_H5 = 0xE5,
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60 | BME280_REGISTER_DIG_H6 = 0xE7,
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61 |
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62 | BME280_REGISTER_CHIPID = 0xD0,
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63 | BME280_REGISTER_VERSION = 0xD1,
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64 | BME280_REGISTER_SOFTRESET = 0xE0,
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65 |
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66 | BME280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0
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67 |
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68 | BME280_REGISTER_CONTROLHUMID = 0xF2,
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69 | BME280_REGISTER_CONTROL = 0xF4,
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70 | BME280_REGISTER_CONFIG = 0xF5,
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71 | BME280_REGISTER_PRESSUREDATA = 0xF7,
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72 | BME280_REGISTER_TEMPDATA = 0xFA,
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73 | BME280_REGISTER_HUMIDDATA = 0xFD,
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74 | };
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75 |
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76 | /*=========================================================================*/
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77 |
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78 | /*=========================================================================
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79 | CALIBRATION DATA
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80 | -----------------------------------------------------------------------*/
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81 | typedef struct
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82 | {
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83 | uint16_t dig_T1;
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84 | int16_t dig_T2;
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85 | int16_t dig_T3;
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86 |
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87 | uint16_t dig_P1;
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88 | int16_t dig_P2;
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89 | int16_t dig_P3;
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90 | int16_t dig_P4;
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91 | int16_t dig_P5;
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92 | int16_t dig_P6;
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93 | int16_t dig_P7;
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94 | int16_t dig_P8;
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95 | int16_t dig_P9;
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96 |
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97 | uint8_t dig_H1;
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98 | int16_t dig_H2;
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99 | uint8_t dig_H3;
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100 | int16_t dig_H4;
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101 | int16_t dig_H5;
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102 | int8_t dig_H6;
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103 | } bme280_calib_data;
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104 | /*=========================================================================*/
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105 |
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106 |
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107 |
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108 | class BME280
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109 | {
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110 | public:
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111 |
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112 | bool begin(uint8_t addr = BME280_ADDRESS);
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113 | float temperature(void);
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114 | float pressure(void);
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115 | float humidity(void);
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116 | float altitude(float seaLevel);
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117 |
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118 | private:
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119 |
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120 | void readCoefficients(void);
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121 |
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122 | void write8(byte reg, byte value);
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123 | uint8_t read8(byte reg);
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124 | uint16_t read16(byte reg);
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125 | uint32_t read24(byte reg);
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126 | int16_t readS16(byte reg);
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127 | uint16_t read16_LE(byte reg); // little endian
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128 | int16_t readS16_LE(byte reg); // little endian
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129 |
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130 | uint8_t _i2caddr;
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131 | int32_t _sensorID;
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132 | int32_t t_fine;
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133 |
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134 | bme280_calib_data _bme280_calib;
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135 |
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136 | };
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137 |
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138 | extern BME280 bme280;
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139 |
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140 | #endif
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