Magneto 9 Click

Magneto 9 Click is a compact add-on board that contains a low-power, accurate, and reliable magnetic sensing device. This board features the A1359, dual tracking output linear hall-effect sensor from Allegro MicroSystems.

Click Product page

Click library

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

Software Support

We provide a library for the Magneto9 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 Magneto9 Click driver.

Standard key functions :

• magneto9_cfg_setup Config Object Initialization function.

  void magneto9_cfg_setup ( magneto9_cfg_t *cfg );

• magneto9_init Initialization function.

  err_t magneto9_init ( magneto9_t *ctx, magneto9_cfg_t *cfg );

Example key functions :

• magneto9_read_adc_voltage This function reads raw 12-bit ADC data and converts it to voltage by using I2C serial interface.

  err_t magneto9_read_adc_voltage ( magneto9_t *ctx, float *voltage );

• magneto9_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.

  err_t magneto9_read_an_pin_voltage ( magneto9_t *ctx, float *data_out );

• magneto9_get_pwm_pin This function returns the PWM pin logic state.

  uint8_t magneto9_get_pwm_pin ( magneto9_t *ctx );

Example Description

This example demonstrates the use of Magneto 9 Click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;            /**< Logger config object. */
    magneto9_cfg_t magneto9_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.
    magneto9_cfg_setup( &magneto9_cfg );
    MAGNETO9_MAP_MIKROBUS( magneto9_cfg, MIKROBUS_1 );
    if ( ADC_ERROR == magneto9_init( &magneto9, &magneto9_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

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

Application Task

Reads the ADC voltage and calculates the magnetic field strength from it. Voltage increases with increasing positive (south) applied magnetic field. All data are being displayed on the USB UART where you can track their changes.

void application_task ( void )
{
    float voltage = 0;

    if ( MAGNETO9_OK == magneto9_read_an_pin_voltage ( &magneto9, &voltage ) )
    {
        float field_strength = MAGNETO9_VOLTAGE_TO_FIELD_STRENGTH ( voltage );
        log_printf( &logger, " ADC Voltage : %.3f V\r\n", voltage );
        log_printf( &logger, " Magnetic field strength : %.3f mT\r\n", field_strength );
        if ( field_strength < 0 )
        {
            log_printf( &logger, " The North Pole magnetic field prevails.\r\n\n" );
        }
        else
        {
            log_printf( &logger, " The South Pole magnetic field prevails.\r\n\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.Magneto9

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.