Hall Switch 2 Click

Hall Switch 2 Click is a compact add-on board that represents a magnetic field-activated dual-relay Click board™. This board features the MHA100KN, a high-performance, low-power Hall-Effect sensor from MEMSIC.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Jul 2021.
• Type : GPIO type

Software Support

We provide a library for the HallSwitch2 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 HallSwitch2 Click driver.

Standard key functions :

• hallswitch2_cfg_setup Config Object Initialization function.

  void hallswitch2_cfg_setup ( hallswitch2_cfg_t *cfg );

• hallswitch2_init Initialization function.

  err_t hallswitch2_init ( hallswitch2_t *ctx, hallswitch2_cfg_t *cfg );

Example key functions :

• hallswitch2_check_state This function checks the S and N pin states, which indicates a magnetic field poles.

  uint8_t hallswitch2_check_state ( hallswitch2_t *ctx );

Example Description

This example demonstrates the use of Hall Switch 2 Click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger and makes an initial log.

void application_init ( void )
{
    log_cfg_t log_cfg;                  /**< Logger config object. */
    hallswitch2_cfg_t hallswitch2_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 );
    Delay_ms ( 100 );
    log_info( &logger, " Application Init " );

    // Click initialization.

    hallswitch2_cfg_setup( &hallswitch2_cfg );
    HALLSWITCH2_MAP_MIKROBUS( hallswitch2_cfg, MIKROBUS_1 );
    if ( hallswitch2_init( &hallswitch2, &hallswitch2_cfg ) == DIGITAL_OUT_UNSUPPORTED_PIN ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

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

Application Task

Displays the corresponding message on the USB UART based on the switches state, i.e. based on the magnetic field presence.

void application_task ( void )
{
    switch ( hallswitch2_check_state( &hallswitch2 ) )
    {
        case HALLSWITCH2_NO_MAGNET_DETECTED:
        {
            if ( HALLSWITCH2_NO_MAGNET_DETECTED != print_state )
            {
                log_printf( &logger, " No magnet detected\r\n" );
                log_printf( &logger, " Switches - disabled\r\n\r\n" );
                print_state = HALLSWITCH2_NO_MAGNET_DETECTED;
            }
            break;
        }
        case HALLSWITCH2_S_POLE_DETECTED:
        {
            if ( HALLSWITCH2_S_POLE_DETECTED != print_state )
            {
                log_printf( &logger, " South pole detected\r\n" );
                log_printf( &logger, " Switch 1 - enabled\r\n\r\n" );
                print_state = HALLSWITCH2_S_POLE_DETECTED;
            }
            break;
        }
        case HALLSWITCH2_N_POLE_DETECTED:
        {
            if ( HALLSWITCH2_N_POLE_DETECTED != print_state )
            {
                log_printf( &logger, " North pole detected\r\n" );
                log_printf( &logger, " Switch 2 - enabled\r\n\r\n" );
                print_state = HALLSWITCH2_N_POLE_DETECTED;
            }
            break;
        }
        default:
        {
            break;
        }
    }
}

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.HallSwitch2

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.