RF Meter 3 click

RF Meter 3 Click is a compact add-on board that collects information, analyzes RF power, and displays information in an easy-to-read digital format. This board features the LT5581, a low-power monolithic precision RMS power detector from Analog Devices. The RMS detector uses a proprietary technique to accurately measure the RF power in a range from 2GHz up to 2.6GHz, well-suited for signals with high crest factors. It outputs a DC voltage in linear scale proportional to an RF input signal power in dBm.

click Product page

Click library

• Author : Stefan Filipovic
• Date : Sep 2021.
• Type : ADC type

Software Support

We provide a library for the RFMeter3 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 RFMeter3 Click driver.

Standard key functions :

• rfmeter3_cfg_setup Config Object Initialization function.

  void rfmeter3_cfg_setup ( rfmeter3_cfg_t *cfg );

• rfmeter3_init Initialization function.

  err_t rfmeter3_init ( rfmeter3_t *ctx, rfmeter3_cfg_t *cfg );

Example key functions :

• rfmeter3_enable_device This function enables device by setting EN pin to HIGH logic level.

  void rfmeter3_enable_device ( rfmeter3_t *ctx );

• rfmeter3_disable_device This function disables device by setting EN pin to LOW logic level.

  void rfmeter3_disable_device ( rfmeter3_t *ctx );

• rfmeter3_get_rf_input_power This function reads the voltage from AN pin and converts it to RF input power in dBm.

  err_t rfmeter3_get_rf_input_power ( rfmeter3_t *ctx, float *data_out );

Example Description

This example demonstrates the use of RF Meter 3 click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and enables the click board.

void application_init ( void )
{
    log_cfg_t log_cfg;            /**< Logger config object. */
    rfmeter3_cfg_t rfmeter3_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.
    rfmeter3_cfg_setup( &rfmeter3_cfg );
    RFMETER3_MAP_MIKROBUS( rfmeter3_cfg, MIKROBUS_1 );
    if ( ADC_ERROR == rfmeter3_init( &rfmeter3, &rfmeter3_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    rfmeter3_enable_device ( &rfmeter3 );
    log_info( &logger, " Application Task " );
}

Application Task

Measures the RF input signal power in dBm and displays the results on the USB UART every 100ms.

void application_task ( void )
{
    float rfmeter3_rf_input_power = 0;

    if ( RFMETER3_ERROR != rfmeter3_get_rf_input_power ( &rfmeter3, &rfmeter3_rf_input_power ) ) 
    {
        log_printf( &logger, " RF Input Power: %.2f dBm\r\n", rfmeter3_rf_input_power );
        Delay_ms ( 100 );
    }
}

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.RFMeter3

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.