Compass 8 Click

Compass 8 Click is a compact add-on board designed for precise compass applications. This board features the AK09919, a 3-axis electronic compass IC from AKM Semiconductor. The AK09919 is based on high-sensitivity Hall sensor technology for detecting terrestrial magnetism across the X, Y, and Z axes, has multiple operational modes, a built-in oscillator, and a Power On Reset circuit. It also includes a magnetic sensor overflow monitor and a 16-sample FIFO data buffer for efficient data handling.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Feb 2024.
• Type : I2C type

Software Support

We provide a library for the Compass 8 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 Compass 8 Click driver.

Standard key functions :

• compass8_cfg_setup Config Object Initialization function.

  void compass8_cfg_setup ( compass8_cfg_t *cfg );

• compass8_init Initialization function.

  err_t compass8_init ( compass8_t *ctx, compass8_cfg_t *cfg );

• compass8_default_cfg Click Default Configuration function.

  err_t compass8_default_cfg ( compass8_t *ctx );

Example key functions :

• compass8_get_magnetic_data This function reads the raw magnetic sensor measurement data and calculates magnetic flux density [microTesla] using the I2C serial interface.

  err_t compass8_get_magnetic_data ( compass8_t *ctx, compass8_axes_t *axis );

• compass8_set_operation_mode This function sets the desired sensor operation mode by using the I2C serial interface.

  err_t compass8_set_operation_mode ( compass8_t *ctx, uint8_t op_mode );

• compass8_sw_reset This function performs software reset by using the I2C serial interface.

  err_t compass8_sw_reset ( compass8_t *ctx );

Example Description

This library contains API for the Compass 8 Click driver. The library initializes and defines the I2C drivers to write and read data from registers, as well as the default configuration for reading measurement data.

The demo application is composed of two sections :

Application Init

The initialization of the I2C module, log UART, and additional pins. After the driver init, the app executes a default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    compass8_cfg_t compass8_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.
    compass8_cfg_setup( &compass8_cfg );
    COMPASS8_MAP_MIKROBUS( compass8_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == compass8_init( &compass8, &compass8_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( COMPASS8_ERROR == compass8_default_cfg ( &compass8 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

This example demonstrates the use of the Compass 8 Click board. Measures and displays magnetic flux density in microtesla (uT) for X-axis, Y-axis, and Z-axis. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void ) 
{
    compass8_axes_t axis; 
    if ( COMPASS8_OK == compass8_get_magnetic_data( &compass8, &axis ) ) 
    {
        log_printf( &logger, " X-axis: %.2f uT\r\n", axis.x );
        log_printf( &logger, " Y-axis: %.2f uT\r\n", axis.y );
        log_printf( &logger, " Z-axis: %.2f uT\r\n", axis.z );      
        log_printf( &logger,  "--------------------\r\n" );
        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.Compass8

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.