UNI HALL Click

UNI HALL Click is a simple solution for adding an unipolar Hall switch to your design. It carries the Melexis US5881 unipolar Hall-effect switch and a 74LVC1T45 single bit, dual supply translating transceiver.

Click Product page

Click library

• Author : Mikroe Team
• Date : Dec 2019.
• Type : GPIO type

Software Support

We provide a library for the UniHall 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 UniHall Click driver.

Standard key functions :

• Config Object Initialization function.

  void unihall_cfg_setup ( unihall_cfg_t *cfg );

• Initialization function.

  UNIHALL_RETVAL unihall_init ( unihall_t ctx, unihall_cfg_t cfg );

• Click Default Configuration function.

  void unihall_default_cfg ( unihall_t *ctx );

Example key functions :

• Detecting north pole magnetic fields status function.

  uint8_t unihall_detecting_magnetic_fields ( unihall_t *ctx );

Examples Description

This is a example which demonstrates the use of UNI HALL Click board.

The demo application is composed of two sections :

Application Init

Initialization driver enable's - GPIO and start write log.

void application_init ( void )
{
    log_cfg_t log_cfg;
    unihall_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_printf(&logger, " --- Application Init ---\r\n");

    //  Click initialization.

    unihall_cfg_setup( &cfg );
    UNIHALL_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    unihall_init( &unihall, &cfg );

    unihall_state = UNIHALL_NORTH_POLE_DETECTED;
    unihall_state_old = UNIHALL_NORTH_POLE_DETECTED;

    log_printf(&logger, "---------------------------\r\n");
    log_printf(&logger, "        Initialization     \r\n");
    log_printf(&logger, "---------------------------\r\n");
    log_printf(&logger, " Detecting magnetic fields \r\n");
    log_printf(&logger, "---------------------------\r\n");

    Delay_ms ( 100 );
}

Application Task

Detect the north pole magnetic fields near the UNI HALL Click. Results are being sent to the Usart Terminal where you can track their changes. All data logs on usb uart when magnetic field is detected.

void application_task ( void )
{
    unihall_state = unihall_detecting_magnetic_fields( &unihall );

    if ( ( unihall_state == UNIHALL_NORTH_POLE_NOT_DETECTED ) && ( unihall_state_old == UNIHALL_NORTH_POLE_DETECTED ) )
    {
        unihall_state_old = UNIHALL_NORTH_POLE_NOT_DETECTED;
        log_printf(&logger, "      ~ NOT DETECTED ~\r\n");
    }

    if ( ( unihall_state == UNIHALL_NORTH_POLE_DETECTED ) && ( unihall_state_old == UNIHALL_NORTH_POLE_NOT_DETECTED ) )
    {

        log_printf(&logger, "        ~ DETECTED ~\r\n");
        unihall_state_old = UNIHALL_NORTH_POLE_DETECTED;
    }
} 

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.UniHall

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.