pwrmeter

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PWR Meter Click

PWR Meter Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : MikroE Team
• Date : jun 2020.
• Type : UART GPS/GNSS type

Software Support

Example Description

This Click is capable of measuring voltage and current through the load, connected to either AC or DC power source. It is used to calculate all the measurement parameters, returning values of multiple power parameters directly, over the UART interface, reducing the processing load on the host MCU. These parameters include active, reactive, and apparent power, current and voltage RMS, line frequency, and power factor.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.PwrMeter

Example Key Functions

• pwrmeter_cfg_setup Config Object Initialization function.

void pwrmeter_cfg_setup ( pwrmeter_cfg_t *cfg );

• pwrmeter_init Initialization function.

err_t pwrmeter_init ( pwrmeter_t *ctx, pwrmeter_cfg_t *cfg );

• pwrmeter_read_reg_word Function reads 16-bit data from the desired register.

err_t pwrmeter_read_reg_word ( pwrmeter_t *ctx, uint16_t register_addr, uint16_t *data_out );

• pwrmeter_read_reg_dword Function reads 32-bit data from the desired register.

err_t pwrmeter_read_reg_dword ( pwrmeter_t *ctx, uint16_t register_addr, uint32_t *data_out );

• pwrmeter_read_reg_signed Function reads signed 16bit or 32bit data from the desired register.

err_t pwrmeter_read_reg_signed ( pwrmeter_t *ctx, uint16_t register_addr, uint8_t data_mode, int32_t *data_out );

Application Init

Initializes UART interface, puts output of regulator in active state and configures gain channel and uart baud rate.

void application_init ( void )
{
    log_cfg_t log_cfg;
    pwrmeter_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 ----" );
    Delay_ms ( 100 );

    //  Click initialization.

    pwrmeter_cfg_setup( &cfg );
    PWRMETER_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pwrmeter_init( &pwrmeter, &cfg );
    Delay_ms ( 500 );
    
    pwrmeter_enable( &pwrmeter, PWRMETER_ENABLE );
    Delay_ms ( 100 );
    
    response_byte = pwrmeter_write_reg_dword ( &pwrmeter, PWRMETER_SYS_CONFIG_REG, PWRMETER_VOLT_GAIN_1 | PWRMETER_CURR_GAIN_8 | PWRMETER_UART_BR_9600 );
    check_response( );
    response_byte = pwrmeter_send_command( &pwrmeter, PWRMETER_SAVE_TO_FLASH_COMM );
    check_response( );

    log_printf( &logger, "PWR Meter is initialized\r\n" );
    Delay_ms ( 100 );
}

Application Task

Reads voltage, current and power measurements from data registers, then converts this values to determined units and logs all results on uart terminal each second.

void application_task ( void )
{
    response_byte = pwrmeter_read_reg_word( &pwrmeter, PWRMETER_VOLT_RMS_REG, &voltage_rms );
    check_response( );
    response_byte = pwrmeter_read_reg_dword( &pwrmeter, PWRMETER_CURR_RMS_REG, &current_rms );
    check_response( );
    response_byte = pwrmeter_read_reg_dword( &pwrmeter, PWRMETER_ACTIVE_PWR_REG, &active_power );
    check_response( );
    response_byte = pwrmeter_read_reg_dword( &pwrmeter, PWRMETER_REACTIVE_PWR_REG, &reactive_power );
    check_response( );
    response_byte = pwrmeter_read_reg_dword( &pwrmeter, PWRMETER_APPARENT_PWR_REG, &apparent_power );
    check_response( );
    response_byte = pwrmeter_read_reg_signed( &pwrmeter, PWRMETER_PWR_FACTOR_REG, PWRMETER_16BIT_DATA, &power_factor );
    check_response( );
    
    meas_data[ 0 ] = ( float ) voltage_rms / 100;
    meas_data[ 1 ] = ( float ) current_rms / 1000;
    meas_data[ 2 ] = ( float ) active_power / 100000;
    meas_data[ 3 ] = ( float ) reactive_power / 100000;
    meas_data[ 4 ] = ( float ) apparent_power / 100000;
    meas_data[ 5 ] = ( float ) power_factor / 32767;
    
    response_byte = pwrmeter_get_status( &pwrmeter, &status_byte );
    check_response( );
    
    if ( ( status_byte & PWRMETER_DCMODE_MASK ) != 0 )
    {
        log_printf( &logger, "DC mode\r\n" );
    }
    else
    {
        log_printf( &logger, "AC mode\r\n" );
    }
    

    log_printf( &logger, "RMS voltage:  " );
    if ( ( ( status_byte & PWRMETER_DCMODE_MASK ) != 0) && ( ( status_byte & PWRMETER_DCVOLT_SIGN_MASK ) == 0 ) )
    {
        log_printf( &logger, "-" );
    }
    log_printf( &logger, "%.2f[ V ]\r\n", meas_data[ 0 ] );
    
    
    log_printf( &logger, "RMS current:  " );
    if ( ( ( status_byte & PWRMETER_DCMODE_MASK ) != 0 ) && ( ( status_byte & PWRMETER_DCCURR_SIGN_MASK ) == 0 ) )
    {
        log_printf( &logger, "-" );
    }
    log_printf( &logger, "%.2f[ mA ]\r\n", meas_data[ 1 ] );
    
    
    log_printf( &logger, "Active power:  " );
    if ( ( status_byte & PWRMETER_PA_SIGN_MASK ) == 0 )
    {
        log_printf( &logger, "-" );
    }
    log_printf( &logger, "%.2f[ W ]\r\n", meas_data[ 2 ] );
    
    
    log_printf( &logger, "Reactive power:  " );
    if ( ( status_byte & PWRMETER_PR_SIGN_MASK ) == 0 )
    {
        log_printf( &logger, "-" );
    }
    log_printf( &logger, "%.2f[ VAr ]\r\n", meas_data[ 3 ] );
    
   
    log_printf( &logger, "Apparent power:  " );
    log_printf( &logger, "%.2f[ VA ]\r\n", meas_data[ 4 ] );

    
    log_printf( &logger, "Power factor:  %.2f\r\n", meas_data[ 5 ] );
    log_printf( &logger, "-----------------------------------\r\n" );
    
    Delay_ms ( 1000 );
}

Note

Do not apply higher voltage than 60V to this board! This Click is designed for lower voltage monitoring and evaluation of the MCP39F511A and its basic functionalities.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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