rmeter

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R Meter Click

R 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 : Jovan Stajkovic
• Date : nov 2019.
• Type : SPI type

Software Support

Example Description

Demo app measures and displays resistance of a resistor connected to the R Meter Click board.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.Rmeter

Example Key Functions

• rmeter_cfg_setup Config Object Initialization function.

void rmeter_cfg_setup ( rmeter_cfg_t *cfg );

• rmeter_init Initialization function.

err_t rmeter_init ( rmeter_t *ctx, rmeter_cfg_t *cfg );

• rmeter_default_cfg Click Default Configuration function.

void rmeter_default_cfg ( rmeter_t *ctx );

• rmeter_get_ohms Get resistance in OHMs function.

float rmeter_get_ohms ( rmeter_t *ctx );

• rmeter_avg_volt Get average voltage function.

float rmeter_avg_volt ( rmeter_t *ctx );

• rmeter_calc Calculations function.

float rmeter_calc ( rmeter_t *ctx, uint32_t resFilt );

Application Init

Initalizes SPI, LOG and Click drivers

void application_init ( void )
{
    log_cfg_t log_cfg;
    rmeter_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 ----" );

    //  Click initialization.

    rmeter_cfg_setup( &cfg );
    RMETER_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    rmeter_init( &rmeter, &cfg );

    Delay_ms ( 100 );
    log_printf( &logger, "----------------------- \r\n" );
    log_printf( &logger, "    R Meter  Click      \r\n" );
    log_printf( &logger, "----------------------- \r\n" );
}

Application Task

This is an example that shows the capabilities of the R Meter Click by measuring resistance.

void application_task ( void )
{
    ohms = rmeter_get_ohms( &rmeter );
    
    if ( ohms == RMETER_OVER_RANGE )
    {
        log_printf( &logger, " Over range! \r\n" );
    }
    else
    {
        log_printf( &logger, "Resistance: %.2f ohm \r\n", ohms );
    }
    
    log_printf( &logger, "----------------------- \r\n" );
    Delay_ms ( 1000 );
}

Note

R Meter Click is a handy tool but it is not to be used as a precision instrument! The linearity of the OpAmp impacts the measurement.

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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