Accel 19 Click

Accel 19 Click is a compact add-on board that contains an acceleration sensor. This board features the LIS2DTW12, an ultra-low-power high-performance three-axis accelerometer from STMicroelectronics. It allows selectable full-scale acceleration measurements in ranges of ±2g, ±4g, ±8g, or ±16g in three axes with a configurable host interface that supports both SPI and I2C serial communication. Alongside an embedded 0.8°C accuracy temperature sensor with ODRs ranging from 50 to 1.6Hz and resolution from 8 to 12 bits, it has a dedicated internal engine to process motion and acceleration detection.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Nov 2021.
• Type : I2C/SPI type

Software Support

We provide a library for the Accel 19 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 19 Click driver.

Standard key functions :

• accel19_cfg_setup Config Object Initialization function.

  void accel19_cfg_setup ( accel19_cfg_t *cfg );

• accel19_init Initialization function.

  err_t accel19_init ( accel19_t *ctx, accel19_cfg_t *cfg );

• accel19_default_cfg Click Default Configuration function.

  err_t accel19_default_cfg ( accel19_t *ctx );

Example key functions :

• accel19_get_axis_data Accel 19 get accelerometer axis function.

  err_t accel19_get_axis_data ( accel19_t *ctx, accel19_axis_t *axis );

• accel19_data_ready Accel 19 data ready function.

  uint8_t accel19_data_ready (accel19_t *ctx );

• accel19_set_control Accel 19 set control function.

  err_t accel19_set_control ( accel19_t *ctx, uint8_t odr, uint8_t op_mode, uint8_t lp_mode );

Example Description

This library contains API for Accel 19 Click driver. The library initializes and defines the I2C or SPI bus drivers to write and read data from registers. The library also includes a function for reading X-axis, Y-axis, and Z-axis data.

The demo application is composed of two sections :

Application Init

The initialization of I2C or SPI module, log UART, and additional pins. After the driver init, the app executes a default configuration and checks communication and device ID.

void application_init ( void )
{
    log_cfg_t log_cfg;          /**< Logger config object. */
    accel19_cfg_t accel19_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.
    accel19_cfg_setup( &accel19_cfg );
    ACCEL19_MAP_MIKROBUS( accel19_cfg, MIKROBUS_1 );
    err_t init_flag  = accel19_init( &accel19, &accel19_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    Delay_ms ( 1000 );

    if ( ACCEL19_ERROR == accel19_default_cfg ( &accel19 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    if ( ACCEL19_ERROR == accel19_check_device_id( &accel19 ) ) 
    {
        log_printf( &logger, "   Communication ERROR   \r\n" );
        log_printf( &logger, "     Reset the device    \r\n" );
        log_printf( &logger, "-------------------------\r\n" );

        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, "-------------------------\r\n" );
    Delay_ms ( 1000 ); 
}

Application Task

This is an example that demonstrates the use of the Accel 19 Click board™. Measures and displays acceleration data for X-axis, Y-axis, and Z-axis. Results are being sent to the USART terminal where the user can track their changes. This task repeats every 1 sec.

void application_task ( void )
{
    static accel19_axis_t axis;

    if ( ACCEL19_STATUS_DRDY == accel19_data_ready( &accel19 ) )
    {
        accel19_get_axis_data( &accel19, &axis );
        log_printf( &logger, "\tX : %5d \r\n\tY : %5d \r\n\tZ : %5d \r\n", axis.x, axis.y, axis.z );
        log_printf( &logger, "-------------------------\r\n" );
        Delay_ms ( 1000 );     
    }
    Delay_ms ( 1 );  
}

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.Accel19

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.