Accel click

Accel Click is an accessory board in mikroBUS form factor. It features ADXL345 3-axis accelerometer module with ultra-low power and high resolution (13-bit) measurement.

click Product page

Click library

• Author : Jovan Stajkovic
• Date : nov 2019.
• Type : I2C/SPI type

Software Support

We provide a library for the Accel 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Accel Click driver.

Standard key functions :

• accel_cfg_setup Config Object Initialization function.

  void accel_cfg_setup ( accel_cfg_t *cfg );

• accel_init Initialization function.

  err_t accel_init ( accel_t *ctx, accel_cfg_t *cfg );

• accel_default_cfg Click Default Configuration function.

  void accel_default_cfg ( accel_t *ctx );

Example key functions :

• accel_read_x_axis Function reads X axis value from Accel.

  int16_t accel_read_x_axis ( accel_t *ctx );

• accel_read_y_axis Function reads Y axis value from Accel.

  int16_t accel_read_y_axis ( accel_t *ctx );

• accel_read_z_axis Function reads Z axis value from Accel.

  int16_t accel_read_z_axis ( accel_t *ctx );

Examples Description

This example demonstrates the use of Accel click board by reading and displaying the accelerometer data (X, Y, and Z axis).

The demo application is composed of two sections :

Application Init

Initializes SPI/I2C driver and settings data read format, power mode, FIFO control and baud rate ( 100Hz default ).

void application_init ( void )
{
    log_cfg_t log_cfg;
    accel_cfg_t cfg;

    /** 
     * 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 " );

    accel_cfg_setup( &cfg );
    ACCEL_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    accel_init( &accel, &cfg );

    accel_generic_read( &accel, ACCEL_REG_DEVID, &tmp, 1 );

    if ( tmp == ACCEL_DEVID )
    {
        log_printf( &logger, "---- Comunication OK!!! ----\r\n" );
    }
    else
    {
        log_printf( &logger, "---- Comunication ERROR!!! ----\r\n" );
        for ( ; ; );
    }
    accel_default_cfg ( &accel );
}

Application Task

Reads X, Y and Z axis and logs on usbuart every 100 ms.

void application_task ( void )
{
    val_x = accel_read_x_axis( &accel );
    log_printf( &logger, "Axis X : %.3f g\r\n", val_x / ACCEL_DATA_RES_LSB_PER_G );

    val_y = accel_read_y_axis( &accel );
    log_printf( &logger, "Axis Y : %.3f g\r\n", val_y / ACCEL_DATA_RES_LSB_PER_G );

    val_z = accel_read_z_axis( &accel );
    log_printf( &logger, "Axis Z : %.3f g\r\n", val_z / ACCEL_DATA_RES_LSB_PER_G );

    log_printf( &logger, "-------------------\r\n" );
    Delay_ms ( 100 );
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Accel

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.