SHT4x - RHT Sensor#

SHT4x Relative Humidity and Temperature Sensor I2C driver.

SHT4X example code#

Basic example for relative humidity and temperature measurement using an SHT4x sensor:

#include "sl_i2cspm_instances.h"
#include "sl_sht4x.h"

  int main( void )
  {

  ...

  int32_t temp_data;
  uint32_t rh_data;

  sl_sht4x_init(sl_i2cspm_sensor, SHT4X_ADDR);
  sl_sht4x_measure_rh_and_temp(sl_i2cspm_sensor, SHT4X_ADDR, &rh_data, &temp_data);

  ...

  }

Sensor Defines#

#define

SHT4X_ADDR 0x44

I2C device address for SHT4X.

Functions#

sl_status_t

sl_sht4x_init(sl_i2cspm_t *i2cspm, uint8_t addr)

Initialize the SHT4x sensor.

sl_status_t

sl_sht4x_present(sl_i2cspm_t *i2cspm, uint8_t addr, uint64_t *device_id)

Check whether an SHT4x sensor is present on the I2C bus or not.

sl_status_t

sl_sht4x_measure_rh_and_temp(sl_i2cspm_t *i2cspm, uint8_t addr, uint32_t *rhData, int32_t *tData)

Measure relative humidity and temperature from an SHT4x sensor.

sl_status_t

sl_sht4x_read_rh_and_temp(sl_i2cspm_t *i2cspm, uint8_t addr, uint32_t *rhData, int32_t *tData)

Read relative humidity and temperature from an SHT4x sensor.

void

sl_sht4x_enable_low_power_mode(bool enable_low_power_mode, uint8_t *sht4x_cmd_measure)

Enables the low power mode.

Sensor Defines Documentation#

Function Documentation#

sl_sht4x_init#

sl_status_t sl_sht4x_init (sl_i2cspm_t * i2cspm, uint8_t addr)

Initialize the SHT4x sensor.

Parameters

Type	Direction	Argument Name	Description
sl_i2cspm_t *	[in]	i2cspm	The I2C peripheral to use.
uint8_t	[in]	addr	The I2C address to probe.

sl_sht4x_present#

sl_status_t sl_sht4x_present (sl_i2cspm_t * i2cspm, uint8_t addr, uint64_t * device_id)

Check whether an SHT4x sensor is present on the I2C bus or not.

Parameters

Type	Direction	Argument Name	Description
sl_i2cspm_t *	[in]	i2cspm	The I2C peripheral to use.
uint8_t	[in]	addr	The I2C address to probe.
uint64_t *	[out]	device_id	Write device ID if device responds. Pass in NULL to discard. Each SHT4x sensor has unique 48-bit serial number.

sl_sht4x_measure_rh_and_temp#

sl_status_t sl_sht4x_measure_rh_and_temp (sl_i2cspm_t * i2cspm, uint8_t addr, uint32_t * rhData, int32_t * tData)

Measure relative humidity and temperature from an SHT4x sensor.

Parameters

Type	Direction	Argument Name	Description
sl_i2cspm_t *	[in]	i2cspm	The I2C peripheral to use.
uint8_t	[in]	addr	The I2C address of the sensor.
uint32_t *	[out]	rhData	The relative humidity in percent (multiplied by 1000).
int32_t *	[out]	tData	The temperature in degree Celsius (multiplied by 1000).

sl_sht4x_read_rh_and_temp#

sl_status_t sl_sht4x_read_rh_and_temp (sl_i2cspm_t * i2cspm, uint8_t addr, uint32_t * rhData, int32_t * tData)

Read relative humidity and temperature from an SHT4x sensor.

Parameters

Type	Direction	Argument Name	Description
sl_i2cspm_t *	[in]	i2cspm	The I2C peripheral to use.
uint8_t	[in]	addr	The I2C address of the sensor.
uint32_t *	[out]	rhData	The relative humidity in percent.
int32_t *	[out]	tData	The temperature in degree Celsius.

sl_sht4x_enable_low_power_mode#

void sl_sht4x_enable_low_power_mode (bool enable_low_power_mode, uint8_t * sht4x_cmd_measure)

Enables the low power mode.

Parameters

Type	Direction	Argument Name	Description
bool	[in]	enable_low_power_mode	If true, enables the SHT4x sensor in low power mode.
uint8_t *	N/A	sht4x_cmd_measure