Accel 29 Click

Accel 29 Click is a compact add-on board that contains an acceleration sensor. This board features the ADXL314, a three-axis ±200g accelerometer from Analog Devices. The ADXL314 offers 16-bit digital output data with a configurable host interface that supports SPI and I2C serial communication. An integrated memory management system with a 32-level FIFO buffer can store data to minimize host processor activity and lower overall system power consumption. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at low power dissipation.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Jan 2023.
• Type : I2C/SPI type

Software Support

We provide a library for the Accel 29 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 Accel 29 Click driver.

Standard key functions :

• accel29_cfg_setup Config Object Initialization function.

  void accel29_cfg_setup ( accel29_cfg_t *cfg );

• accel29_init Initialization function.

  err_t accel29_init ( accel29_t *ctx, accel29_cfg_t *cfg );

• accel29_default_cfg Click Default Configuration function.

  err_t accel29_default_cfg ( accel29_t *ctx );

Example key functions :

• accel29_calibrate_offset This function calibrates accel offset to the specified values by setting the OFSX/Y/Z registers.

  err_t accel29_calibrate_offset ( accel29_t *ctx, accel29_axes_t calib_axes );

• accel29_get_avg_axes This function reads a specified number of samples for accel X, Y, and Z axis data in g and averages them.

  err_t accel29_get_avg_axes ( accel29_t *ctx, uint16_t num_samples, accel29_axes_t *avg_axes );

Example Description

This example demonstrates the use of Accel 29 Click board by reading and displaying the accelerometer data (X, Y, and Z axis) averaged from 100 samples.

The demo application is composed of two sections :

Application Init

Initializes the driver, performs the Click default configuration, and calibrates the accel data offsets.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    accel29_cfg_t accel29_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.
    accel29_cfg_setup( &accel29_cfg );
    ACCEL29_MAP_MIKROBUS( accel29_cfg, MIKROBUS_1 );
    err_t init_flag = accel29_init( &accel29, &accel29_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ACCEL29_ERROR == accel29_default_cfg ( &accel29 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    accel29_axes_t calib_axes;
    calib_axes.x = ACCEL29_CALIB_X;
    calib_axes.y = ACCEL29_CALIB_Y;
    calib_axes.z = ACCEL29_CALIB_Z;
    if ( ACCEL29_ERROR == accel29_calibrate_offset ( &accel29, calib_axes ) )
    {
        log_error( &logger, " Calibrate offset." );
        for ( ; ; );
    }

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

Application Task

Reads and displays on the USB UART the accelerometer data (X, Y, and Z axis) averaged from 100 samples.

void application_task ( void )
{
    accel29_axes_t axes;
    if ( ACCEL29_OK == accel29_get_avg_axes ( &accel29, ACCEL29_NUM_OF_SAMPLES, &axes ) )
    {
        log_printf( &logger, " X: %.1f g\r\n", axes.x );
        log_printf( &logger, " Y: %.1f g\r\n", axes.y );
        log_printf( &logger, " Z: %.1f g\r\n\n", axes.z );
    }
}

Note

This Click board should be used for high g applications of up to +-200g. It is not recommended for low g applications because of its high scale factor which is about 48.83 mg per LSB.

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.Accel29

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.