Suga koubou / SHT1x

mbed library to use a SENSIRION SHT1x/SHT7x sensor humidity and temperature

SHT1x.h@0:ad72ec3d85e8, 2012-06-21 (annotated)

Committer:
okini3939
Date:
Thu Jun 21 03:56:43 2012 +0000
Revision:
0:ad72ec3d85e8

        

        
Who changed what in which revision?

        

            
                
UserRevisionLine numberNew contents of line

            
            


okini3939

0:ad72ec3d85e8


     1

/*





okini3939

0:ad72ec3d85e8


     2

 * mbed library to use a SENSIRION SHT1x/SHT7x sensor





okini3939

0:ad72ec3d85e8


     3

 * Copyright (c) 2011 Hiroshi Suga





okini3939

0:ad72ec3d85e8


     4

 * Released under the MIT License: http://mbed.org/license/mit





okini3939

0:ad72ec3d85e8


     5

 */





okini3939

0:ad72ec3d85e8


     6

 





okini3939

0:ad72ec3d85e8


     7

/** @file





okini3939

0:ad72ec3d85e8


     8

 * @brief mbed library to use a SENSIRION SHT1x/SHT7x sensor





okini3939

0:ad72ec3d85e8


     9

 * humidity/temperature sensor SHT11, SHT15, SHT71, SHT75 (SENSIRION)





okini3939

0:ad72ec3d85e8


    10

 * interface: I2C digital





okini3939

0:ad72ec3d85e8


    11

 */





okini3939

0:ad72ec3d85e8


    12

 





okini3939

0:ad72ec3d85e8


    13

#ifndef SHT1x_H





okini3939

0:ad72ec3d85e8


    14

#define SHT1x_H





okini3939

0:ad72ec3d85e8


    15







okini3939

0:ad72ec3d85e8


    16

#include "mbed.h"





okini3939

0:ad72ec3d85e8


    17







okini3939

0:ad72ec3d85e8


    18

/**





okini3939

0:ad72ec3d85e8


    19

 * @brief resolution setting





okini3939

0:ad72ec3d85e8


    20

 */





okini3939

0:ad72ec3d85e8


    21

enum SHT_acc {





okini3939

0:ad72ec3d85e8


    22

    SHT_low = 0, ///< RH 8bit, temp 12bit





okini3939

0:ad72ec3d85e8


    23

    SHT_high = 1, ///< RH 10bit, temp 14bit





okini3939

0:ad72ec3d85e8


    24

};





okini3939

0:ad72ec3d85e8


    25







okini3939

0:ad72ec3d85e8


    26

enum SHT_vdd {





okini3939

0:ad72ec3d85e8


    27

    SHT_3V3 = 0,





okini3939

0:ad72ec3d85e8


    28

    SHT_5V = 1,





okini3939

0:ad72ec3d85e8


    29

};





okini3939

0:ad72ec3d85e8


    30







okini3939

0:ad72ec3d85e8


    31

/**





okini3939

0:ad72ec3d85e8


    32

 * @brief SHT1x class





okini3939

0:ad72ec3d85e8


    33

 */





okini3939

0:ad72ec3d85e8


    34

class SHT1x : public Base {





okini3939

0:ad72ec3d85e8


    35

public:





okini3939

0:ad72ec3d85e8


    36

    /**





okini3939

0:ad72ec3d85e8


    37

     * @brief Initializes interface (private I2C)





okini3939

0:ad72ec3d85e8


    38

     * @param p_sda port of I2C SDA





okini3939

0:ad72ec3d85e8


    39

     * @param p_scl port of I2C SCL





okini3939

0:ad72ec3d85e8


    40

     * @param p_acc resolution setting





okini3939

0:ad72ec3d85e8


    41

     * @param p_vdd power





okini3939

0:ad72ec3d85e8


    42

     */





okini3939

0:ad72ec3d85e8


    43

    SHT1x(PinName p_sda, PinName p_scl, SHT_acc p_acc = SHT_high, SHT_vdd p_vdd = SHT_3V3);





okini3939

0:ad72ec3d85e8


    44







okini3939

0:ad72ec3d85e8


    45

    /**





okini3939

0:ad72ec3d85e8


    46

     * @brief Initializes interface (public I2C)





okini3939

0:ad72ec3d85e8


    47

     * @param p_i2c instance of I2C class





okini3939

0:ad72ec3d85e8


    48

     * @param p_acc resolution setting





okini3939

0:ad72ec3d85e8


    49

     * @param p_vdd power





okini3939

0:ad72ec3d85e8


    50

     */





okini3939

0:ad72ec3d85e8


    51

    SHT1x(I2C& p_i2c, SHT_acc p_acc = SHT_high, SHT_vdd p_vdd = SHT_3V3);





okini3939

0:ad72ec3d85e8


    52







okini3939

0:ad72ec3d85e8


    53

    /**





okini3939

0:ad72ec3d85e8


    54

     * @brief Get temperature





okini3939

0:ad72ec3d85e8


    55

     * @return temperature (`C)





okini3939

0:ad72ec3d85e8


    56

     */





okini3939

0:ad72ec3d85e8


    57

    float get_temperature();





okini3939

0:ad72ec3d85e8


    58







okini3939

0:ad72ec3d85e8


    59

    /**





okini3939

0:ad72ec3d85e8


    60

     * @brief Get humidity





okini3939

0:ad72ec3d85e8


    61

     * @return humidity (%)





okini3939

0:ad72ec3d85e8


    62

     */





okini3939

0:ad72ec3d85e8


    63

    float get_humidity();





okini3939

0:ad72ec3d85e8


    64







okini3939

0:ad72ec3d85e8


    65

    /**





okini3939

0:ad72ec3d85e8


    66

     * @brief Update results





okini3939

0:ad72ec3d85e8


    67

     */





okini3939

0:ad72ec3d85e8


    68

    void update();





okini3939

0:ad72ec3d85e8


    69







okini3939

0:ad72ec3d85e8


    70

protected:





okini3939

0:ad72ec3d85e8


    71

    void init(SHT_acc p_acc, SHT_vdd p_vdd);





okini3939

0:ad72ec3d85e8


    72

    unsigned short twi_readshort (int addr, int wait);





okini3939

0:ad72ec3d85e8


    73

    void twi_writechar (int, int);





okini3939

0:ad72ec3d85e8


    74







okini3939

0:ad72ec3d85e8


    75

    I2C i2c;





okini3939

0:ad72ec3d85e8


    76

    float humidity, temperature;





okini3939

0:ad72ec3d85e8


    77







okini3939

0:ad72ec3d85e8


    78

private:





okini3939

0:ad72ec3d85e8


    79

    float d1, d2, c1, c2, c3, t1, t2;





okini3939

0:ad72ec3d85e8


    80

    enum SHT_acc accuracy;





okini3939

0:ad72ec3d85e8


    81

};





okini3939

0:ad72ec3d85e8


    82







okini3939

0:ad72ec3d85e8


    83

#endif