Adafruit_SCD30.h

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#ifndef _ADAFRUIT_SCD30_H
#define _ADAFRUIT_SCD30_H

#include "Arduino.h"
#include <Adafruit_BusIO_Register.h>
#include <Adafruit_I2CDevice.h>
#include <Adafruit_Sensor.h>
#include <Wire.h>
#define SCD30_I2CADDR_DEFAULT 0x61 
#define SCD30_CHIP_ID 0x60         

#define SCD30_WHOAMI 0xD100 

#define SCD30_CMD_READ_MEASUREMENT 0x0300 

#define SCD30_CMD_CONTINUOUS_MEASUREMENT                                       \
  0x0010 
#define SCD30_CMD_STOP_MEASUREMENTS 0x0104 
#define SCD30_CMD_SET_MEASUREMENT_INTERVAL                                     \
  0x4600                                
#define SCD30_CMD_GET_DATA_READY 0x0202 
#define SCD30_CMD_AUTOMATIC_SELF_CALIBRATION                                   \
  0x5306 
#define SCD30_CMD_SET_FORCED_RECALIBRATION_REF                                 \
  0x5204 
#define SCD30_CMD_SET_TEMPERATURE_OFFSET 0x5403 
#define SCD30_CMD_SET_ALTITUDE_COMPENSATION                                    \
  0x5102                               
#define SCD30_CMD_SOFT_RESET 0xD304    
#define SCD30_CMD_READ_REVISION 0xD100 

typedef enum {
  SCD30_RATE_ONE_SHOT,
  SCD30_RATE_1_HZ,
  SCD30_RATE_7_HZ,
  SCD30_RATE_12_5_HZ,
  SCD30_RATE_25_HZ,
} scd30_rate_t;

class Adafruit_SCD30;

class Adafruit_SCD30_Temp : public Adafruit_Sensor {
public:
  Adafruit_SCD30_Temp(Adafruit_SCD30 *parent) { _theSCD30 = parent; }
  bool getEvent(sensors_event_t *);
  void getSensor(sensor_t *);

private:
  int _sensorID = 0xC02;
  Adafruit_SCD30 *_theSCD30 = NULL;
};

class Adafruit_SCD30_Humidity : public Adafruit_Sensor {
public:
  Adafruit_SCD30_Humidity(Adafruit_SCD30 *parent) { _theSCD30 = parent; }
  bool getEvent(sensors_event_t *);
  void getSensor(sensor_t *);

private:
  int _sensorID = 0xC02 + 1;
  Adafruit_SCD30 *_theSCD30 = NULL;
};

class Adafruit_SCD30 {
public:
  Adafruit_SCD30();
  ~Adafruit_SCD30();

  bool begin(uint8_t i2c_addr = SCD30_I2CADDR_DEFAULT, TwoWire *wire = &Wire,
             int32_t sensor_id = 0);

  void reset(void);
  bool dataReady(void);
  bool getEvent(sensors_event_t *humidity, sensors_event_t *temp);

  bool read(void);

  uint16_t getMeasurementInterval(void);
  bool setMeasurementInterval(uint16_t interval);

  bool selfCalibrationEnabled(void);
  bool selfCalibrationEnabled(bool);

  bool startContinuousMeasurement(uint16_t pressure = 0);
  uint16_t getAmbientPressureOffset(void);

  bool setAltitudeOffset(uint16_t altitude);
  uint16_t getAltitudeOffset(void);

  bool setTemperatureOffset(uint16_t temp_offset);
  uint16_t getTemperatureOffset(void);

  bool forceRecalibrationWithReference(uint16_t reference);
  uint16_t getForcedCalibrationReference(void);

  Adafruit_Sensor *getTemperatureSensor(void);
  Adafruit_Sensor *getHumiditySensor(void);
  float CO2,             
      temperature,       
      relative_humidity; 
  ;

protected:
  virtual bool _init(int32_t sensor_id);

  uint16_t _sensorid_humidity, 
      _sensorid_temp;          

  Adafruit_I2CDevice *i2c_dev = NULL; 

  Adafruit_SCD30_Temp *temp_sensor = NULL; 
  Adafruit_SCD30_Humidity *humidity_sensor =
      NULL; 

private:
  friend class Adafruit_SCD30_Temp;     
  friend class Adafruit_SCD30_Humidity; 

  void fillHumidityEvent(sensors_event_t *humidity, uint32_t timestamp);
  void fillTempEvent(sensors_event_t *temp, uint32_t timestamp);
  bool sendCommand(uint16_t command, uint16_t argument);
  bool sendCommand(uint16_t command);
  uint16_t getAmbiendPressure(void);
  uint8_t computeCRC8(uint8_t data[], uint8_t len);
  uint16_t readRegister(uint16_t reg_address);
};

#endif