Magnetic Rotary Click

Magnetic rotary Click is a very accurate position sensing Click board™ which utilizes the HMC1512, a magnetic field displacement sensor IC. This integrated sensor uses two coplanar saturated-mode Wheatstone bridges which consist of four magneto-resistive elements per bridge.

Click Product page

Click library

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

Software Support

We provide a library for the MagneticRotary 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 MagneticRotary Click driver.

Standard key functions :

• Config Object Initialization function.

  void magneticrotary_cfg_setup ( magneticrotary_cfg_t *cfg );

• Initialization function.

  MAGNETICROTARY_RETVAL magneticrotary_init ( magneticrotary_t ctx, magneticrotary_cfg_t cfg );

• Click Default Configuration function.

  void magneticrotary_default_cfg ( magneticrotary_t *ctx );

Example key functions :

• This function returns a 12bit result of AD conversion.

  uint16_t magnrotary_read_adc ( magneticrotary_t *ctx, uint8_t cmnd_byte );

• This function returns ADC voltage value calculated to millivolts, depending on the voltage selection.

  uint16_t magnrotary_out_volt_adc ( magneticrotary_t *ctx, uint8_t cmd_byte, uint16_t pwr_volt );

• This function returns a magnetic field angle calculated to degrees,from -90 to 90 degrees.

  double magnrotary_get_field_angle( magneticrotary_t *ctx, uint8_t cmd_byte );

Examples Description

This example reads a magnetic field angle calculated to degrees for channel A The angle can be measured in the range from -90 to 90 degrees.

The demo application is composed of two sections :

Application Init

Initializes peripherals, pins, SPI interface for communication with the device.

void application_init ( void )
{
    log_cfg_t log_cfg;
    magneticrotary_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.

    magneticrotary_cfg_setup( &cfg );
    MAGNETICROTARY_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    magneticrotary_init( &magneticrotary, &cfg );
    log_info(&logger, "Magnetic rotary successufully initialized!\r\n");

}

Application Task

Reads a magnetic field angle calculated to degrees for channel A in Single-Ended Mode and logs results.

void application_task ( void )
{
    //  Task implementation.

    magn_angle = magnrotary_get_field_angle( &magneticrotary, MAGNROTARY_CHA_POS_GND_NEG | 
                                                              MAGNROTARY_MSB_ZEROS_ORDER );

    log_printf( &logger, "Angle:    %.2lf \r\n ", magn_angle );

    Delay_ms ( 500 );
} 

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.MagneticRotary

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.