Grove_Temperature_And_Humidity_Sensor/DHT.h

#ifndef DHT_H
#define DHT_H
#if ARDUINO >= 100
    #include "Arduino.h"
#else
    #include "WProgram.h"
#endif
#include <Wire.h>

// 8 MHz(ish) AVR ---------------------------------------------------------
#if (F_CPU >= 7400000UL) && (F_CPU <= 9500000UL)
    #define COUNT 3
    // 16 MHz(ish) AVR --------------------------------------------------------
#elif (F_CPU >= 15400000UL) && (F_CPU <= 19000000L)
    #define COUNT 6
    // 48MHz SAMD21J18A (Sodaq Explorer)
#elif (F_CPU == 48000000UL)
    #define COUNT 18
    // 168MHz STM32F405 STM32F407
#elif (F_CPU == 168000000L)
    #define COUNT 40
#elif (F_CPU == 80000000L)
    #define COUNT 22
#elif (F_CPU == 160000000L)
    #define COUNT 36
#else
    #define COUNT 25
    //#error "CPU SPEED NOT SUPPORTED"
#endif

/*  DHT library

    MIT license
    written by Adafruit Industries
*/

// how many timing transitions we need to keep track of. 2 * number bits + extra
#define MAXTIMINGS 85
#define SERIALPRINT Serial

#define DEFAULT_IIC_ADDR    0x38
#define RESET_REG_ADDR      0xba
#define  HUMIDITY_INDEX     0
#define  TEMPRATURE_INDEX   1

#define DHT11 11
#define DHT22 22
#define DHT21 21
#define AM2301 21

#define DHT10 10

class DHT {
  private:
    uint8_t data[6];
    uint8_t _pin, _type, _count;
    boolean read(void);
    unsigned long _lastreadtime;
    boolean firstreading;

  public:
    DHT(uint8_t pin, uint8_t type, uint8_t count = COUNT);
    void begin(void);
    float readTemperature(bool S = false);
    float convertCtoF(float);
    float readHumidity(void);

    /** Common  interface to get temp&humi value.support all DHT device.

        @return 0 for calibrated failed,1 for succeed.
     **/
    int readTempAndHumidity(float* data);

    // DHT10 digital interfaces(i2c),onlu for DHT10 .
    int i2cReadByte(uint8_t& byte);
    int i2cReadBytes(uint8_t* bytes, uint32_t len);
    int i2cWriteBytes(uint8_t* bytes, uint32_t len);
    int i2cWriteByte(uint8_t byte);


    /** Reset sensor.
        @return 0 for calibrated failed,1 for succeed.
     **/
    int DHT10Reset(void);

    /** Read status register.check the calibration flag - bit[3]: 1- calibrated ok ,0 - Not calibrated.

        @return 0 for calibrated failed,1 for succeed.

     **/
    int DHT10ReadStatus(void);
    /** Init sensor,send 0x08,0x00 to register 0xe1.
        @ return : 0 if success, non-zero if failed.
     **/
    int setSystemCfg(void);

    /** Read temp & humi result buf from sensor.
        total 6 bytes,the first byte for status register,other 5 bytes for temp & humidity data.
        @ return : 0 if success, non-zero if failed.
     **/
    int readTargetData(uint32_t* data);

    /** DHT10 Init function.
        Reset sensor and wait for calibration complete.
        @ return : 0 if success, non-zero if failed.
     **/
    int DHT10Init(void);


};
#endif