AccelPressure Click

Accel&Pressure Click is a compact add-on board representing a rate-of-climb sensing solution for your application. This board features the FXLS8974CF, a 3-axis low-g accelerometer, and the MPL3115A2, a precision pressure sensor with altimetry, both from NXP Semiconductor. Those two sensors are high-performance, low-power devices covering all of Earth's surface elevations. By combining the acceleration and the barometric pressure data, you can easily determine the vertical velocity (the rate of climb) of the device on which the Accel&Pressure Click is integrated.

Click Product page

Click library

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

Software Support

We provide a library for the AccelPressure 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 AccelPressure Click driver.

Standard key functions :

• accelpressure_cfg_setup Config Object Initialization function.

  void accelpressure_cfg_setup ( accelpressure_cfg_t *cfg );

• accelpressure_init Initialization function.

  err_t accelpressure_init ( accelpressure_t *ctx, accelpressure_cfg_t *cfg );

• accelpressure_default_cfg Click Default Configuration function.

  err_t accelpressure_default_cfg ( accelpressure_t *ctx );

Example key functions :

• accelpressure_get_axes_data This function reads the accelerometer sensor axes data.

  err_t accelpressure_get_axes_data ( accelpressure_t *ctx, accelpressure_axes_t *axes );

• accelpressure_get_pressure This function reads the sensor pressure data conversion in mbar.

  err_t accelpressure_get_pressure ( accelpressure_t *ctx, float *pressure );

• accelpressure_get_temperature This function reads the conversion of sensor pressure data in degrees Celsius.

  err_t accelpressure_get_temperature ( accelpressure_t *ctx, float *temperature );

Example Description

This library contains API for the AccelPressure Click driver. The library initializes and defines the I2C drivers to write and read data from registers, as well as the default configuration for reading the accelerator, pressure, and temperature data.

The demo application is composed of two sections :

Application Init

The initialization of the I2C module, log UART, and additional pins. After the driver init, the app executes a default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    accelpressure_cfg_t accelpressure_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.
    accelpressure_cfg_setup( &accelpressure_cfg );
    ACCELPRESSURE_MAP_MIKROBUS( accelpressure_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == accelpressure_init( &accelpressure, &accelpressure_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ACCELPRESSURE_ERROR == accelpressure_default_cfg ( &accelpressure ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, "_________________\r\n" );
}

Application Task

This example demonstrates the use of the AccelPressure Click board. Measures and displays acceleration data for the X-axis, Y-axis, and Z-axis [mg], pressure [mBar], and temperature [degree Celsius] data. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    accelpressure_axes_t acc_axis;
    float pressure = 0, temperature = 0;
    if ( ACCELPRESSURE_OK == accelpressure_get_axes_data( &accelpressure, &acc_axis ) )
    {
        log_printf( &logger, " Accel X: %.2f mg\r\n", acc_axis.x );
        log_printf( &logger, " Accel Y: %.2f mg\r\n", acc_axis.y );
        log_printf( &logger, " Accel Z: %.2f mg\r\n", acc_axis.z );
    }
    log_printf( &logger, "_________________\r\n" );
    Delay_ms ( 100 );

    if ( ACCELPRESSURE_OK == accelpressure_get_pressure( &accelpressure, &pressure ) )
    {
        log_printf( &logger, " Pressure: %.2f mbar\r\n", pressure );
    }
    Delay_ms ( 100 );

    if ( ACCELPRESSURE_OK == accelpressure_get_temperature( &accelpressure, &temperature ) )
    {
        log_printf( &logger, " Temperature: %.2f mbar\r\n", temperature );
    }
    log_printf( &logger, "_________________\r\n" );
    Delay_ms ( 1000 );
}

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.AccelPressure

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.