Pressure 15 Click

Pressure 15 Click is a compact add-on board that contains a board-mount pressure sensor. This board features the LPS27HHW, an ultra-compact piezoresistive absolute pressure sensor that functions as a digital output barometer from STMicroelectronics.

Click Product page

Click library

• Author : Luka Filipovic
• Date : Jun 2021.
• Type : I2C/SPI type

Software Support

We provide a library for the Pressure15 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 Pressure15 Click driver.

Standard key functions :

• pressure15_cfg_setup Config Object Initialization function.

  void pressure15_cfg_setup ( pressure15_cfg_t *cfg );

• pressure15_init Initialization function.

  err_t pressure15_init ( pressure15_t *ctx, pressure15_cfg_t *cfg );

• pressure15_default_cfg Click Default Configuration function.

  err_t pressure15_default_cfg ( pressure15_t *ctx );

Example key functions :

• pressure15_get_int Get interrupt pin state.

  uint8_t pressure15_get_int ( pressure15_t *ctx );

• pressure15_get_pressure Get pressure data.

  err_t pressure15_get_pressure ( pressure15_t *ctx, float *pressure );

• pressure15_get_temperature Get temperature data.

  err_t pressure15_get_temperature ( pressure15_t *ctx, float *temperature );

Example Description

This application example showcases the ability of the device to read temperature and pressure data.

The demo application is composed of two sections :

Application Init

Initialization of hosts communication modules (UART, SPI/I2C) and interrupt pin. Checks device ID and sets the default configuration that enables interrupt on new data.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    pressure15_cfg_t pressure15_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.
    pressure15_cfg_setup( &pressure15_cfg );
    PRESSURE15_MAP_MIKROBUS( pressure15_cfg, MIKROBUS_1 );
    err_t init_flag = pressure15_init( &pressure15, &pressure15_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    uint8_t whoami = 0;
    init_flag = pressure15_generic_read( &pressure15, PRESSURE15_REG_WHO_AM_I, &whoami, 1 );
    if ( !init_flag && ( PRESSURE15_ID == whoami ) )
    {
        log_printf( &logger, " > ID: 0x%.2X\r\n", ( uint16_t )whoami );
    }
    else
    {
        log_error( &logger, " ID\r\n");
    }

    pressure15_default_cfg ( &pressure15 );
    Delay_ms ( 1000 );
    log_info( &logger, " Application Task " );
}

Application Task

Checks if an interrupt occurred. If occurred reads new pressure and temperature data in hPa and degC respectively.

void application_task ( void ) 
{
    if ( pressure15_get_int( &pressure15 ) )
    {
        float temperature, pressure;

        pressure15_get_pressure( &pressure15, &pressure );
        log_printf( &logger, " > Pressure[hPa]: %.2f\r\n", pressure );

        pressure15_get_temperature( &pressure15, &temperature );
        log_printf( &logger, " > Temperature[degC]: %.2f\r\n", temperature );
        log_printf( &logger, "***************************************\r\n" );
        Delay_ms ( 200 );
    }
}

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.Pressure15

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.