current9

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Current 9 click

Current 9 Click is a compact add-on board providing a precise and accurate current sensing solution. This board features the CT415-HSN830DR, high-bandwidth and ultra-low-noise XtremeSense® TMR current sensor designed for the current range up to 30A from Crocus Technology. This sensor also features an integrated current-carrying conductor which handles rated current and generates a current measurement as a linear analog output voltage, accomplishing a total output error of about ±1% full-scale. After that, the user is allowed to process the output voltage in analog or digital form.

click Product page

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Click library

• Author : Stefan Filipovic
• Date : Aug 2022.
• Type : ADC/I2C type

Software Support

We provide a library for the Current 9 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 Current 9 Click driver.

Standard key functions :

• current9_cfg_setup Config Object Initialization function.

void current9_cfg_setup ( current9_cfg_t *cfg );

• current9_init Initialization function.

err_t current9_init ( current9_t *ctx, current9_cfg_t *cfg );

Example key functions :

• current9_read_voltage This function reads raw ADC value and converts it to proportional voltage level.

err_t current9_read_voltage ( current9_t *ctx, float *voltage );

• current9_read_current This function reads the input current level [A] based on @b CURRENT9_NUM_CONVERSIONS of voltage measurements.

err_t current9_read_current ( current9_t *ctx, float *current );

• current9_set_vref This function sets the voltage reference for Current 9 click driver.

err_t current9_set_vref ( current9_t *ctx, float vref );

Example Description

This example demonstrates the use of Current 9 click board by reading and displaying the input current measurements.

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. */
    current9_cfg_t current9_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.
    current9_cfg_setup( &current9_cfg );
    CURRENT9_MAP_MIKROBUS( current9_cfg, MIKROBUS_1 );
    err_t init_flag = current9_init( &current9, &current9_cfg );
    if ( ( ADC_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    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 ( CURRENT9_OK == current9_read_current ( &current9, &current ) ) 
    {
        log_printf( &logger, " Current : %.3f[A]\r\n\n", current );
        Delay_ms( 1000 );
    }
}

Note

For better accuracy, set the voltage reference by using the @b current9_set_vref function, increase the number of conversions by modifying the @b CURRENT9_NUM_CONVERSIONS macro, and adjust the @b CURRENT9_ZERO_CURRENT_OFFSET voltage value.

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.Current9

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.

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