SCD4X

Sensirion SCD4X CO₂ sensor. More...

Files
file	scd4x.h
	Header file for extended sensor API of SCD4X sensor.

Enumerations
enum	sensor_attribute_scd4x {   SENSOR_ATTR_SCD4X_TEMPERATURE_OFFSET = SENSOR_ATTR_PRIV_START , SENSOR_ATTR_SCD4X_SENSOR_ALTITUDE , SENSOR_ATTR_SCD4X_AMBIENT_PRESSURE , SENSOR_ATTR_SCD4X_AUTOMATIC_CALIB_ENABLE ,   SENSOR_ATTR_SCD4X_SELF_CALIB_INITIAL_PERIOD , SENSOR_ATTR_SCD4X_SELF_CALIB_STANDARD_PERIOD }
	Custom sensor attributes for SCD4X. More...

Functions
int	scd4x_forced_recalibration (const struct device *dev, uint16_t target_concentration, uint16_t *frc_correction)
	Performs a forced recalibration.
int	scd4x_self_test (const struct device *dev)
	Performs a self test.
int	scd4x_persist_settings (const struct device *dev)
	Performs a self test.
int	scd4x_factory_reset (const struct device *dev)
	Performs a factory reset.

Detailed Description

Sensirion SCD4X CO₂ sensor.

Enumeration Type Documentation

sensor_attribute_scd4x

enum sensor_attribute_scd4x

#include <include/zephyr/drivers/sensor/scd4x.h>

Custom sensor attributes for SCD4X.

Enumerator
SENSOR_ATTR_SCD4X_TEMPERATURE_OFFSET	Temperature offset. 0 - 20°C
SENSOR_ATTR_SCD4X_SENSOR_ALTITUDE	Altitude of the sensor. 0 - 3000m
SENSOR_ATTR_SCD4X_AMBIENT_PRESSURE	Ambient pressure in hPa. 700 - 1200hPa
SENSOR_ATTR_SCD4X_AUTOMATIC_CALIB_ENABLE	Automatic calibration enable (enabled: 1 / disabled: 0). Default: enabled.
SENSOR_ATTR_SCD4X_SELF_CALIB_INITIAL_PERIOD	Initial period for automatic self calibration correction (in hours). Allowed values are integer multiples of 4 hours. Default: 44
SENSOR_ATTR_SCD4X_SELF_CALIB_STANDARD_PERIOD	Standard period for automatic self calibration correction (in hours). Allowed values are integer multiples of 4 hours. Default: 156

Function Documentation

scd4x_factory_reset()

int scd4x_factory_reset

(

const struct device *

dev

)

#include <include/zephyr/drivers/sensor/scd4x.h>

Performs a factory reset.

The perform_factory_reset command resets all configuration settings stored in the EEPROM and erases the FRC and ASC algorithm history.

Parameters

dev	Pointer to the sensor device

Returns

0 if successful, negative errno code if failure.

scd4x_forced_recalibration()

int scd4x_forced_recalibration	(	const struct device *	dev,
		uint16_t	target_concentration,
		uint16_t *	frc_correction
	)

#include <include/zephyr/drivers/sensor/scd4x.h>

Performs a forced recalibration.

Operate the SCD4x in the operation mode for at least 3 minutes in an environment with a homogeneous and constant CO2 concentration. Otherwise the recalibratioin will fail. The sensor must be operated at the voltage desired for the application when performing the FRC sequence.

Parameters

dev	Pointer to the sensor device
target_concentration	Reference CO2 concentration.
frc_correction	Previous differences from the target concentration

Returns

0 if successful, negative errno code if failure.

scd4x_persist_settings()

int scd4x_persist_settings

(

const struct device *

dev

)

#include <include/zephyr/drivers/sensor/scd4x.h>

Performs a self test.

The persist_settings command can be used to save the actual configuration. This command should only be sent when persistence is required and if actual changes to the configuration have been made. The EEPROM is guaranteed to withstand at least 2000 write cycles

Parameters

dev	Pointer to the sensor device

Returns

0 if successful, negative errno code if failure.

scd4x_self_test()

int scd4x_self_test

(

const struct device *

dev

)

#include <include/zephyr/drivers/sensor/scd4x.h>

Performs a self test.

The self_test command can be used as an end-of-line test to check the sensor functionality

Parameters

dev	Pointer to the sensor device

Returns

0 if successful, negative errno code if failure.