PRESS Click

PRESS Click is a compact add-on board that contains a board-mount pressure sensor. This board features the ILPS28QSW, an absolute digital output barometer from STMicroelectronics. It is a dual full-scale sensor with a measuring range of 260 up to 4060hPa. In addition, it comes with a Qvar detection ability, which is an electric charge variation detection and is available on two pins.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Aug 2023.
• Type : I2C type

Software Support

We provide a library for the PRESS 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 PRESS Click driver.

Standard key functions :

• press_cfg_setup Config Object Initialization function.

  void press_cfg_setup ( press_cfg_t *cfg );

• press_init Initialization function.

  err_t press_init ( press_t *ctx, press_cfg_t *cfg );

• press_default_cfg Click Default Configuration function.

  err_t press_default_cfg ( press_t *ctx );

Example key functions :

• press_get_measurement_data PRESS gets the measurement data function.

  err_t press_get_measurement_data ( press_t *ctx, float *pressure, float *temperature );

• press_get_ah_qvar_data PRESS gets the AH/Qvar data function.

  err_t press_get_ah_qvar_data ( press_t *ctx, float *ah_qvar );

• press_sw_reset PRESS software reset function.

  
  err_t press_sw_reset ( press_t *ctx );

## Example Description

> This example demonstrates the use of PRESS Click board™ by reading and displaying
> the pressure, temperature and Qvar measurements.

**The demo application is composed of two sections :**

### Application Init

> The initialization of I2C module and log UART.
> After driver initialization, the app sets the default configuration.

```c
void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    press_cfg_t press_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.
    press_cfg_setup( &press_cfg );
    PRESS_MAP_MIKROBUS( press_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == press_init( &press, &press_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( PRESS_ERROR == press_default_cfg ( &press ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    log_info( &logger, " Application Task " );

#if ( EXAMPLE_MODE == EXAMPLE_MODE_PRESS_TEMP )
    log_printf( &logger, " Pressure and Temperature\r\n" );
#elif ( EXAMPLE_MODE == EXAMPLE_MODE_SWIPE_SENSING )
    if ( PRESS_OK == press_config_ah_qvar( &press, PRESS_AH_QVAR_ENABLE ) )
    {
        log_printf( &logger, " Swipe sensing\r\n" );
    }
    else
    {
        log_error( &logger, " Qvar configuration.\r\n" );
        for ( ; ; );
    }
#endif
    log_printf( &logger, " ______________________ \r\n" );
    Delay_ms ( 1000 );
}

Application Task

The demo application shows the module working depending on the example mode:

• EXAMPLE_MODE_PRESS_TEMP: Reads and displays the Pressure [mBar] and Temperature [degree Celsius] data.
• EXAMPLE_MODE_SWIPE_SENSING: Detect a touch or a swipe. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
#if ( EXAMPLE_MODE == EXAMPLE_MODE_PRESS_TEMP )
    example_pressure_temperature( );
#elif ( EXAMPLE_MODE == EXAMPLE_MODE_SWIPE_SENSING )
    example_swipe_sensing( );
#endif
}

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.PRESS

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.