Reference

Library

• SHT Library for Arduino. Installation instructions: Download the library from GitHub, extract the folder to your Arduino Libraries directory, and restart the Arduino IDE. (About how to install the library?)

Communication Protocol Description

The sensor uses the I2C communication interface. The default I2C addresses are 0x44 (SHT40-AD1B) and 0x45 (SHT40-BD1B).

API Description

  /**
   * @brief  对主控板的IIC进行了初始化
   */
  void begin();

  /**
   * @brief  获取温度数据
   * @return 温度值,单位：摄氏度
   */
  float getTemperature();

  /**
   * @brief  获取湿度数据
   * @return 湿度值,单位：%RH
   */
  float getHumidity();

  /**
   * @brief  获取温湿度数据
   * @param   tem  存放温度数据的引用
   * @param   hum  存放湿度数据的引用
   */
  void  getTemHum(float &tem, float &hum);

  /**
   * @brief  设置传感器工作模式
   * @param  mode  传感器的工作模式
   * @n            SHTC3：
   * @n                    PRECISION_HIGH_CLKSTRETCH_ON                              Clock Stretching Enabled 
   * @n                    PRECISION_HIGH_CLKSTRETCH_OFF                             Clock Stretching Disabled 
   * @n                    PRECISION_LOW_CLKSTRETCH_ON                               Clock Stretching Enabled & Low Power
   * @n                    PRECISION_LOW_CLKSTRETCH_OFF                              Clock Stretching Disabled & Low Power
   * @n            SHT40:
   * @n                    PRECISION_HIGH_HEATER_OFF                                 measure T & RH with high precision (high repeatability) 
   * @n                    PRECISION_MID_HEATER_OFF                                  measure T & RH with medium precision (medium repeatability)
   * @n                    PRECISION_LOW_HEATER_OFF                                  measure T & RH with lowest precision (low repeatability) 
   * @n                    PRECISION_HIGH_HEATER_1S                                  activate highest heater power & high precis. meas. (typ. 200mW @ 3.3V) for 1s 
   * @n                    PRECISION_HIGH_HEATER_100MS                               activate highest heater power & high precis. meas. (typ. 200mW @ 3.3V) for 0.1s
   * @n                    PRECISION_MID_HEATER_1S                                   activate medium heater power  & high precis. meas. (typ. 110mW @ 3.3V) for 1s 
   * @n                    PRECISION_MID_HEATER_100MS                                activate medium heater power  & high precis. meas. (typ. 110mW @ 3.3V) for 0.1s 
   * @n                    PRECISION_LOW_HEATER_1S                                   activate lowest heater power  & high precis. meas. (typ. 20mW @ 3.3V) for 1s 
   * @n                    PRECISION_LOW_HEATER_100MS                                activate lowest heater power  & high precis. meas. (typ. 20mW @ 3.3V) for 0.1s 
   */
   void setMode(uint16_t mode) ;

  /**
   * @brief  获取传感器的唯一标识符
   * @return 获取成功返回传感器的唯一标识符,失败返回0
   */
   uint32_t getDeviceID();

  /**
   * @brief  software reset
   */
   void softwareReset() ;

  /**
   * @brief  Obtain raw data of temperature and humidity
   * @param  temp Pointer to the address of the original value of the temperature
   * @param  hun   Pointer to the address of the original value of the humidity
   * @return Is the data obtained correct? return true  The data is correct ; return false  The data  is incorrect
   */
   bool getTandRHRawData(uint16_t *temp, uint16_t *hum);