Compass 2 click

Compass 2 click carries the AK8963 3-axis electronic compass. The AK8963 sensor is based on the Hall effect.

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Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : I2C/SPI type

Software Support

We provide a library for the Compass2 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 Compass2 Click driver.

Standard key functions :

• Config Object Initialization function.

  void compass2_cfg_setup ( compass2_cfg_t *cfg );

• Initialization function.

  COMPASS2_RETVAL compass2_init ( compass2_t ctx, compass2_cfg_t cfg );

• Click Default Configuration function.

  void compass2_default_cfg ( compass2_t *ctx );

Example key functions :

• This function gets the data from one specified axis.

  int16_t compass2_get_axis_data ( compass2_t *ctx, uint8_t axis );

• This function prepares the device for a new measurement.

  void compass2_new_measurement ( compass2_t *ctx );

• This function does a hardware reset of the device.

  void compass2_reset ( compass2_t *ctx );

Examples Description

The example prepares the device for a new measurement and reads and displays data from all three axes.

The demo application is composed of two sections :

Application Init

Initializes and configures the click and logger modules.

void application_init ( )
{
    log_cfg_t log_cfg;
    compass2_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 ----" );

    //  Click initialization.

    compass2_cfg_setup( &cfg );
    COMPASS2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    compass2_init( &compass2, &cfg );
    compass2_default_cfg( &compass2 );
}

Application Task

Reads and displays data from all three axes every two seconds.

void application_task ( )
{
    int16_t x_axis;
    int16_t y_axis;
    int16_t z_axis;

    compass2_new_measurement( &compass2 );

    log_printf( &logger, " --- Axis ---\r\n" );

    x_axis = compass2_get_axis_data( &compass2, COMPASS2_X_AXIS );
    y_axis = compass2_get_axis_data( &compass2, COMPASS2_Y_AXIS );
    z_axis = compass2_get_axis_data( &compass2, COMPASS2_Z_AXIS );

    log_printf( &logger, "X: %d\r\n", x_axis );
    log_printf( &logger, "Y: %d\r\n", y_axis );
    log_printf( &logger, "Z: %d\r\n", z_axis );

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

    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}  

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.Compass2

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.