Power Monitor click

Power Monitor Click is a compact add-on board that represents an ultra-precise power monitoring solution. This board features the INA228, a digital power monitor with a 20-bit delta-sigma ADC specifically designed for current-sensing applications from Texas Instruments. The INA228 reports current, bus voltage, temperature, power, energy, and charge accumulation while employing a precision ±0.5 % integrated oscillator, all while performing the needed calculations in the background. It can measure a full-scale differential input of ±163.84mV or ±40.96mV across a resistive shunt sense element, with common-mode voltage support up to +85V. This Click board™ is suitable for current-sensing applications in DC-DC converters, power inverters, telecom equipment, industrial measurements, and many more.

click Product page

Click library

• Author : Nenad Filipovic
• Date : Jul 2021.
• Type : I2C type

Software Support

We provide a library for the PowerMonitor 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 PowerMonitor Click driver.

Standard key functions :

• powermonitor_cfg_setup Config Object Initialization function.

  void powermonitor_cfg_setup ( powermonitor_cfg_t *cfg );

• powermonitor_init Initialization function.

  err_t powermonitor_init ( powermonitor_t *ctx, powermonitor_cfg_t *cfg );

• powermonitor_default_cfg Click Default Configuration function.

  err_t powermonitor_default_cfg ( powermonitor_t *ctx );

Example key functions :

• powermonitor_get_vshunt Power Monitor get shunt voltage function.

  err_t powermonitor_get_vshunt ( powermonitor_t *ctx, float *vshunt );

• powermonitor_get_vbus Power Monitor get bus voltage function.

  err_t powermonitor_get_vbus ( powermonitor_t *ctx, float *vbus );

• powermonitor_get_current Power Monitor get current function.

  err_t powermonitor_get_current ( powermonitor_t *ctx, float *current );

Example Description

This library contains API for Power Monitor Click driver. The library initializes and defines the I2C bus drivers to write and read data from registers. The library also includes a function for reading Shunt and Bus voltage ( mV ), Current ( mA ), Power ( W ), Energy ( J ),
as well as the Temperature in degrees Celsius.

The demo application is composed of two sections :

Application Init

The initialization of I2C module, log UART, and additional pins. After the driver init and then executes a default configuration, the app checks communication, display Manufacturer, Stores Device and Revision ID.

void application_init ( void ) 
{
    log_cfg_t log_cfg;                    /**< Logger config object. */
    powermonitor_cfg_t powermonitor_cfg;  /**< Click config object. */
    static uint8_t manufacturer_id[ 2 ];
    static uint16_t dieid;
    static uint8_t rev_id;

    powermonitor.shunt = 0.28;

    /** 
     * 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.
    powermonitor_cfg_setup( &powermonitor_cfg );
    POWERMONITOR_MAP_MIKROBUS( powermonitor_cfg, MIKROBUS_1 );
    err_t init_flag = powermonitor_init( &powermonitor, &powermonitor_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    powermonitor_default_cfg ( &powermonitor );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms ( 100 );

    powermonitor_get_id( &powermonitor, &manufacturer_id, &dieid, &rev_id );
    log_printf( &logger, "  Manufacturer ID  : %.2s\r\n", manufacturer_id );
    log_printf( &logger, "  Stores Device ID : 0x%.3X\r\n", dieid );
    log_printf( &logger, "  Revision ID      : 0x%.1X\r\n", rev_id );
    log_printf( &logger, "----------------------------\r\n" );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

This is an example that shows the use of a Power Monitor Click board™. Measures and displays Shunt voltage ( mV ), Bus voltage ( mV ), Current ( mA ), Power ( W ), Energy ( J ) and Temperature ( degrees Celsius ). Results are being sent to the USART terminal where the user can track their changes. This task repeats every 2.5 sec.

void application_task ( void ) 
{
    static float vshunt, vbus, current, power, energy, temperature;

    powermonitor_get_vshunt( &powermonitor, &vshunt );
    log_printf( &logger, " Shunt voltage : %.2f mV\r\n", vshunt );
    Delay_ms ( 100 ); 

    powermonitor_get_vbus( &powermonitor, &vbus );
    log_printf( &logger, " BUS voltage   : %.2f mV\r\n", vbus );
    Delay_ms ( 100 );

    powermonitor_get_current( &powermonitor, &current );
    log_printf( &logger, " Current       : %.2f mA\r\n", current );
    Delay_ms ( 100 ); 

    powermonitor_get_power( &powermonitor, &power );
    log_printf( &logger, " Power         : %.6f W\r\n", power );
    Delay_ms ( 100 ); 

    powermonitor_get_energy( &powermonitor, &energy );
    log_printf( &logger, " Energy        : %.6f J\r\n", energy );
    log_printf( &logger, "- - - - - - - - - - - - - - \r\n" );
    Delay_ms ( 100 ); 

    powermonitor_get_temperature( &powermonitor, &temperature );
    log_printf( &logger, " Temperature   : %.2f C\r\n", temperature );
    log_printf( &logger, "----------------------------\r\n" );
    Delay_ms ( 1000 );
    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.PowerMonitor

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.