Accel 18 click

Accel 18 Click is a compact add-on board that contains an acceleration sensor. This board features the MC3419, a digital output 3-axis accelerometer with a feature set optimized for consumer product motion sensing from MEMSIC.

click Product page

Click library

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

Software Support

We provide a library for the Accel18 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 Accel18 Click driver.

Standard key functions :

• accel18_cfg_setup Config Object Initialization function.

  void accel18_cfg_setup ( accel18_cfg_t *cfg );

• accel18_init Initialization function.

  err_t accel18_init ( accel18_t *ctx, accel18_cfg_t *cfg );

• accel18_default_cfg Click Default Configuration function.

  err_t accel18_default_cfg ( accel18_t *ctx );

Example key functions :

• accel18_read_axes Accel data reading.

  err_t accel18_read_axes ( accel18_t *ctx, accel18_axes_t *axes_data );

• accel18_set_range Set range configuration.

  err_t accel18_set_range ( accel18_t *ctx, uint8_t range_macro );

• accel18_get_interrupt_1 Get interrupt 1 pin state.

  uint8_t accel18_get_interrupt_1 ( accel18_t *ctx );

Example Description

This example application showcases ability of the device to read axes values on detected interrupt.

The demo application is composed of two sections :

Application Init

Initialization of comunication modules(SPI/I2C, UART) and additional two interrupt pins. Then configures device and sets 8g range and 10 Hz data rate, with interrupt enabled.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    accel18_cfg_t accel18_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.
    accel18_cfg_setup( &accel18_cfg );
    ACCEL18_MAP_MIKROBUS( accel18_cfg, MIKROBUS_1 );
    err_t init_flag  = accel18_init( &accel18, &accel18_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 ( ; ; );
    }

    if ( accel18_default_cfg ( &accel18 ) )
    {
        log_error( &logger, " Default configuration. " );
        log_info( &logger, " Please, run program again... " );
        for ( ; ; );
    }

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

Application Task

Whenever interrupt is detected checks interrupt status for data ready, and then reads x, y, and z axes, calculates value and logs result.

void application_task ( void )
{
    accel18_axes_t axes_data;
    if ( !accel18_get_interrupt_1( &accel18 ) )
    {
        // Check interrupts
        uint8_t interrupt_state = 0;
        accel18_byte_read( &accel18, ACCEL18_REG_INTERRUPT_STATUS, &interrupt_state );
        if ( interrupt_state & ACCEL18_INT_ACQ_EN )
        {
            // Axis read
            accel18_read_axes( &accel18, &axes_data );
            log_printf( &logger, " > X[g]: %.2f\r\n", axes_data.x );
            log_printf( &logger, " > Y[g]: %.2f\r\n", axes_data.y );
            log_printf( &logger, " > Z[g]: %.2f\r\n", axes_data.z );
            log_printf( &logger, "**************************\r\n" );
        }
        // Clear interrupts
        if ( interrupt_state )
        {
            accel18_byte_write( &accel18, ACCEL18_REG_INTERRUPT_STATUS, ~interrupt_state );
        }
    }
}

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.Accel18

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.