HTS221 Humidity Sensor

Measure relative humidity and temperature from HTS221 sensor

Since R2021b

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Libraries:
Simulink Coder Support Package for STMicroelectronics Nucleo Boards/ Sensors
Embedded Coder Support Package for STMicroelectronics Discovery Boards/ STM32L475-Discovery (B-L475E-IOT01A)

Description

The HTS221 Humidity Sensor block measures relative humidity and ambient temperature using the HTS221 humidity sensor interfaced with the Nucleo/STM32L475-Discovery board. This sensor comprises of a sensing element to measure the relative humidity and temperature.

You can also select an output data rate for the measured values in the block.

Examples

Read Data from I2C-Based Sensors on STM32L475VG Discovery Board

Use the Embedded Coder® Support Package for STMicroelectronics® STM32 Processors to configure and read data from these sensors on the STM32L475VG Discovery (B-L475E-IOT01A) board: LPS22HB MEMS nano pressure sensor.

Open Example

Ports

Output

Humidity — Relative humidity as measured by HTS221 sensor

scalar

The block outputs the relative humidity in percentage (%).

Dependencies

This output port appears only if you select the Humidity (%) parameter.

Data Types: double

Temperature — Temperature measured by HTS221 sensor

scalar

Dependencies

This output port appears only if you select the Temperature (℃) parameter.

Data Types: double

Status — Status of pressure and temperature measurements

0 | 1 | -1

Status of pressure and temperature measurements, specified as a 1-by-2 vector. 0 indicates that the data read is new, 1 indicates that the data read is not new, and -1 indicates that the corresponding output is not selected.

Dependencies

This output port appears only if you select the Status parameter.

Data Types: int8

Parameters

Use onboard sensors — Enable to use onboard sensors

on (default) | off

Select this parameter to use onboard sensors.

Note

This parameters is available only for STM32L475VG-Discovery (B-L475E-IOT01A) board.

I2C module — Specify I2C module

2 (default) | positive integer

Specify the I2C module on the board. The I2C bus frequency, serial clock (SCL) pin and serial data (SDA) pin are taken according to the corresponding I2C module entry in the configuration parameters.

Dependencies

To enable this parameter, deselect the Use onboard sensors parameter.

Humidity (%) — Set output port for reading humidity

on (default) | off

Select this parameter to set Humidity as one of the output ports.

Temperature (℃) — Set output port for reading temperature

on (default) | off

Select this parameter to set Temperature as one of the output ports.

Status — Set output port for obtaining status

off (default) | on

Select this parameter to set Status as one of the output ports.

Output data rate (ODR) — Rate at which humidity and temperature data is sampled

1 Hz (default) | 7 Hz | 12.5 Hz

Select the output data rate at which humidity data is sampled.

Sample time — Time interval to read data

-1 (default) | positive integer

Specify how often this block reads the data from the HTS221 sensor. When you set this parameter to -1, Simulink determines the best sample time for the block based on the block context within the model.

Version History

Introduced in R2021b