/**
    * @fn begin
    * @brief Init
    * @return Bool type, indicate whether init succeeded
    * @retval True Succeeded
    * @retval False Failed
    */
   bool begin(void);      
   /**
    * @fn gainParticleConcentration_ugm3
    * @brief Get particle concentration of a specific type
    * @param type: Set PM type to be output
    * @n          PARTICLE_PM1_0_STANDARD
    * @n          PARTICLE_PM2_5_STANDARD
    * @n          PARTICLE_PM10_STANDARD
    * @n          PARTICLE_PM1_0_ATMOSPHERE
    * @n          PARTICLE_PM2_5_ATMOSPHERE
    * @n          PARTICLE_PM10_ATMOSPHERE
    * @return uint16_t type, indicate returning the particle concentration of the specific type
    */
   uint16_t gainParticleConcentration_ugm3(uint8_t type);      
   /**
    * @fn gainParticleNum_Every0_1L
    * @brief Get the number of particles in 0.1L of air
    * @param type: Set particle type to be output
    * @n          PARTICLENUM_0_3_UM_EVERY0_1L_AIR
    * @n          PARTICLENUM_0_5_UM_EVERY0_1L_AIR
    * @n          PARTICLENUM_1_0_UM_EVERY0_1L_AIR
    * @n          PARTICLENUM_2_5_UM_EVERY0_1L_AIR
    * @n          PARTICLENUM_5_0_UM_EVERY0_1L_AIR
    * @n          PARTICLENUM_10_UM_EVERY0_1L_AIR
    * @return uint16_t type, indicate the particle number in every 0.1L of air
    */
   uint16_t gainParticleNum_Every0_1L(uint8_t type);      
   /**
    * @fn gainVersion
    * @brief Get firmware version
    * @return uint8_t type, firmware version
    */
   uint8_t gainVersion(void);      
   /**
    * @fn setLowpower
    * @brief Control the sensor to enter low-power mode
    */
   void setLowpower(void);      
   /**
    * @fn awake
    * @brief Wake up sensor
    */
   void awake(void);