Accel 24 Click

Accel 24 Click is a compact add-on board that contains an acceleration sensor. This board features the MXC6655XA, a 12-bit three-axis accelerometer from MEMSIC. It allows selectable full-scale acceleration measurements in ranges of ±2g, ±4g, or ±8g in three axes with a compatible I2C serial interface with 400KHz fast mode operation. Alongside low offset and temperature signal with high accuracy, the MXC6655XA also detects six orientation positions, X/Y shake, and shake directions with an appropriate interrupt signal for these states.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Aug 2022.
• Type : I2C type

Software Support

We provide a library for the Accel 24 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 24 Click driver.

Standard key functions :

• accel24_cfg_setup Config Object Initialization function.

  void accel24_cfg_setup ( accel24_cfg_t *cfg );

• accel24_init Initialization function.

  err_t accel24_init ( accel24_t *ctx, accel24_cfg_t *cfg );

• accel24_default_cfg Click Default Configuration function.

  err_t accel24_default_cfg ( accel24_t *ctx );

Example key functions :

• accel24_get_int_pin This function returns the INT pin logic state.

  uint8_t accel24_get_int_pin ( accel24_t *ctx );

• accel24_read_data This function checks the data ready bit, clears it, and then reads the accel (X, Y, Z) and temperature measurements.

  err_t accel24_read_data ( accel24_t *ctx, accel24_data_t *data_out );

• accel24_set_full_scale_range This function sets the full scale range resolution.

  err_t accel24_set_full_scale_range ( accel24_t *ctx, uint8_t fsr );

Example Description

This example demonstrates the use of Accel 24 Click board by reading and displaying accel data (X, Y, and Z axis) as well as temperature measurements on the USB UART.

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. */
    accel24_cfg_t accel24_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.
    accel24_cfg_setup( &accel24_cfg );
    ACCEL24_MAP_MIKROBUS( accel24_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == accel24_init( &accel24, &accel24_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( ACCEL24_ERROR == accel24_default_cfg ( &accel24 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

Reads and displays the accel data (X, Y, and Z axis) as well as temperature measurements on the USB UART every 100ms approximately.

void application_task ( void )
{
    accel24_data_t meas_data;
    // Wait for data ready indication
    while ( accel24_get_int_pin ( &accel24 ) );

    if ( ACCEL24_OK == accel24_read_data ( &accel24, &meas_data ) )
    {
        log_printf( &logger, " X: %.3f g\r\n", meas_data.x );
        log_printf( &logger, " Y: %.3f g\r\n", meas_data.y );
        log_printf( &logger, " Z: %.3f g\r\n", meas_data.z );
        log_printf( &logger, " Temperature: %.2f degC\r\n", meas_data.temperature );
    }
    Delay_ms ( 100 );
}

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.Accel24

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.