Hall Switch 3 Click

Hall Switch 3 Click is a compact add-on board representing a magnetic field-activated switch. This board features the NMH1000, a Hall-effect magnetic switch from NXP Semiconductor. It is a low-voltage, low-current, and low-output data rate device with a very small size. The switch is most sensitive to a vertical field passing through the top-bottom surfaces, orthogonal to the plane of the Hall Switch 3 Click board™.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Nov 2023.
• Type : I2C type

Software Support

We provide a library for the Hall Switch 3 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 Hall Switch 3 Click driver.

Standard key functions :

• hallswitch3_cfg_setup Config Object Initialization function.

  void hallswitch3_cfg_setup ( hallswitch3_cfg_t *cfg );

• hallswitch3_init Initialization function.

  err_t hallswitch3_init ( hallswitch3_t *ctx, hallswitch3_cfg_t *cfg );

• hallswitch3_default_cfg Click Default Configuration function.

  err_t hallswitch3_default_cfg ( hallswitch3_t *ctx );

Example key functions :

• hallswitch3_get_mag_data This function is used to indicates a relative magnetic field strength.

  err_t hallswitch3_get_mag_data ( hallswitch3_t *ctx, int8_t *mag_data );

• hallswitch3_set_out_data_rate This function provides the capability for the user to override the fixed sample rate controlling the sleep-compare-Vout cycle time.

  err_t hallswitch3_set_out_data_rate ( hallswitch3_t *ctx, uint8_t odr );

• hallswitch3_get_status This function reads a status reporting of modes and selections.

  err_t hallswitch3_get_status ( hallswitch3_t *ctx, uint8_t *status );

Example Description

This example demonstrates the use of Hall Switch 3 Click board by reading and displaying the magnetic field strength value.

The demo application is composed of two sections :

Application Init

Initialization of I2C module and log UART. After driver initialization, the app executes a default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    hallswitch3_cfg_t hallswitch3_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.
    hallswitch3_cfg_setup( &hallswitch3_cfg );
    HALLSWITCH3_MAP_MIKROBUS( hallswitch3_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == hallswitch3_init( &hallswitch3, &hallswitch3_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( HALLSWITCH3_ERROR == hallswitch3_default_cfg ( &hallswitch3 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

This example demonstrates the use of the Hall Switch 3 Click board. The demo application reads and displays the relative magnetic field strength value [Gaussian units] and detects when the magnetic field strength is not in the configured range. The results are sent to the UART terminal, where you can monitor their changes.

void application_task ( void ) 
{
    int8_t mag_data = 0;
    if ( HALLSWITCH3_OK == hallswitch3_get_mag_data( &hallswitch3, &mag_data ) )
    {
        log_printf( &logger, " Magnetic Field: %d [Gs]\r\n", ( int16_t ) mag_data );
        if ( HALLSWITCH3_OUT_STATE_LOW == hallswitch3_check_mag_field( &hallswitch3 ) )
        {
            log_printf( &logger, " The switch is open.\r\n" );
        }
    }
    Delay_ms ( 1000 );
}

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.HallSwitch3

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.