Hall Current 21 Click

Hall Current 21 Click is a compact add-on board designed for precise current measurement across a wide frequency range, ideal for fast and accurate monitoring applications. This board features the ACS37030, a galvanically-isolated current sensor from Allegro Microsystems. It provides bidirectional current sensing with a range of ±65A and a sensitivity of 20.3mV/A, offering high isolation of 3500VRMS and a working voltage of up to 840VRMS. It also features low noise and a wide operating bandwidth, making it suitable for high-speed switching current and control loop monitoring. This Click board™ is perfect for power supplies in servers, data centers, and solar DC-DC converters.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Oct 2024.
• Type : SPI type

Software Support

We provide a library for the Hall Current 21 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 Current 21 Click driver.

Standard key functions :

• hallcurrent21_cfg_setup Config Object Initialization function.

  void hallcurrent21_cfg_setup ( hallcurrent21_cfg_t *cfg );

• hallcurrent21_init Initialization function.

  err_t hallcurrent21_init ( hallcurrent21_t *ctx, hallcurrent21_cfg_t *cfg );

Example key functions :

• hallcurrent21_read_voltage_avg This function reads a desired number of ADC samples and calculates the average voltage level of the selected input channel.

  err_t hallcurrent21_read_voltage_avg ( hallcurrent21_t *ctx, uint8_t channel, uint16_t num_conv, float *voltage_avg );

• hallcurrent21_calib_resolution This function reads the sensor voltage reference and calibrates the data resolution at a known load current.

  err_t hallcurrent21_calib_resolution ( hallcurrent21_t *ctx, float calib_current );

• hallcurrent21_read_current This function reads the input current level [A].

  err_t hallcurrent21_read_current ( hallcurrent21_t *ctx, float *current );

Example Description

This example demonstrates the use of Hall Current 21 Click board by reading and displaying the input current measurements.

The demo application is composed of two sections :

Application Init

Initializes the driver and calibrates the data resolution at 3A load current.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    hallcurrent21_cfg_t hallcurrent21_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.
    hallcurrent21_cfg_setup( &hallcurrent21_cfg );
    HALLCURRENT21_MAP_MIKROBUS( hallcurrent21_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == hallcurrent21_init( &hallcurrent21, &hallcurrent21_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_printf( &logger, " Calibrating data resolution in 5 seconds...\r\n" );
    log_printf( &logger, " Keep the load current set at %.1fA during the calibration process.\r\n", 
                HALLCURRENT21_CALIBRATING_CURRENT );
    for ( uint8_t cnt = 5; cnt > 0; cnt-- )
    {
        log_printf( &logger, " %u\r\n", ( uint16_t ) cnt );
        Delay_ms ( 1000 );
    }
    if ( HALLCURRENT21_ERROR == hallcurrent21_calib_resolution ( &hallcurrent21, 
                                                                 HALLCURRENT21_CALIBRATING_CURRENT ) )
    {
        log_error( &logger, " Calibrate resolution." );
        for ( ; ; );
    }
    log_printf( &logger, " Data resolution calibration DONE.\r\n" );

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

Application Task

Reads the input current measurements and displays the results on the USB UART approximately once per second.

void application_task ( void )
{
    float current = 0;
    if ( HALLCURRENT21_OK == hallcurrent21_read_current ( &hallcurrent21, &current ) ) 
    {
        log_printf( &logger, " Current : %.1f A\r\n\n", current );
        Delay_ms ( 1000 );
    }
}

Note

The measurement range is approximately: +/- 65A.

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.HallCurrent21

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.