Barometer 8 Click

Barometer 8 Click is a compact add-on board used to measure air pressure in a specific environment. This board features the ILPS22QS, an ultra-compact piezoresistive absolute pressure sensor that functions as a digital output barometer from STMicroelectronics. The ILPS22QS comprises a sensing element and an IC chip for signal processing in one package, converts pressure into a 24-bit digital value, and sends the information via a configurable host interface that supports SPI and I2C serial communications. It has a selectable dual full-scale absolute pressure range, up to 1260hPa and 4060hPa, with an accuracy of 0.5hPa over a wide operating temperature range.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Mar 2022.
• Type : I2C/SPI type

Software Support

We provide a library for the Barometer 8 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Barometer 8 Click driver.

Standard key functions :

• barometer8_cfg_setup Config Object Initialization function.

  void barometer8_cfg_setup ( barometer8_cfg_t *cfg );

• barometer8_init Initialization function.

  err_t barometer8_init ( barometer8_t *ctx, barometer8_cfg_t *cfg );

• barometer8_default_cfg Click Default Configuration function.

  err_t barometer8_default_cfg ( barometer8_t *ctx );

Example key functions :

• barometer8_write_register This function writes a desired data byte to the selected register.

  err_t barometer8_write_register ( barometer8_t *ctx, uint8_t reg, uint8_t data_in );

• barometer8_read_register This function reads a data byte from the selected register.

  err_t barometer8_read_register ( barometer8_t *ctx, uint8_t reg, uint8_t *data_out );

• barometer8_read_data This function reads the pressure and temperature raw data and converts them to mBar and Celsius.

  err_t barometer8_read_data ( barometer8_t *ctx, float *pressure, float *temperature );

Example Description

This example demonstrates the use of Barometer 8 Click board by reading and displaying the pressure and temperature values.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    barometer8_cfg_t barometer8_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    barometer8_cfg_setup( &barometer8_cfg );
    BAROMETER8_MAP_MIKROBUS( barometer8_cfg, MIKROBUS_1 );
    err_t init_flag  = barometer8_init( &barometer8, &barometer8_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( BAROMETER8_ERROR == barometer8_default_cfg ( &barometer8 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Reads and displays the pressure and temperature data on the USB UART every 250ms approximately, as per output data rate (ODR) bits configuration.

void application_task ( void )
{
    float pressure, temperature;
    if ( BAROMETER8_OK == barometer8_read_data ( &barometer8, &pressure, &temperature ) )
    {
        log_printf ( &logger, " Pressure: %.1f mBar\r\n", pressure );
        log_printf ( &logger, " Temperature: %.2f C\r\n\n", temperature );
    }
    Delay_ms ( 5 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Barometer8

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.