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mikroSDK Library

RMS to DC click

Rating:

7

Author: MIKROE

Last Updated: 2019-01-16

Package Version: 1.0.0.0

mikroSDK Library: 1.0.0.0

Category: Measurements

Downloaded: 5000 times

Not followed.

License: MIT license  

RMS to DC click is a Click board that is used to convert the RMS of the input signal into a DC voltage, with a value directly readable over the I2C interface. The Click board is equipped with the LTC1968, an RMS-to-DC converter IC, which outputs an analog voltage depending on the RMS value of the input signal.

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  • mikroSDK Library 2.0.0.0
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mikroSDK Library Blog

RMS to DC click

RMS to DC click

Native view of the RMS to DC Click board.

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RMS to DC click

RMS to DC click

Front and back view of the RMS to DC Click board.

View full image

Library Description

The library performs an RMS to DC signal converting with 12bit resolution. It is also possible to get the averaged output DC signal (voltage), with a minimalized noise. For more details check the documentation.

Key functions:

  • uint16_t rms2dc_readADC( void ) - The function returns a 12bit result of AD conversion.
  • T_RMS2DC_V rms2dc_voutADC( T_RMS2DC_V vccSel ) - The function returns the output voltage value calculated to mV, depending on the power voltage selection.
  • T_RMS2DC_V rms2dc_avrgVoutADC( T_RMS2DC_V vccSelect, uint8_t nSamples ) - The function returns the averaged output voltage value calculated to mV, depending on the power voltage selection.

Examples description

The application is composed of the three sections :

  • System Initialization - Initializes peripherals and pins.
  • Application Initialization - Initializes I2C interface and turns ON the device.
  • Application Task - (code snippet) - Reads averaged DC output voltage calculated to mV, and sends results to the serial plotter. Note: The input voltage frequency should be in the range from 50Hz to 250kHz. Als,o the input voltage amplitude must be lower than 5V. In these conditions, the device can convert the RMS signal, in every form, to DC signal.
void applicationTask()
{
    outVoltDC = rms2dc_avrgVoutADC( _RMS2DC_VCC_3V3, 25 );
    
    plotData( outVoltDC );

    Delay_ms( 5 );
}

Additional Functions :

  • void plotData( T_RMS2DC_V plotY ) - Sends data (DC voltage) to the serial plotter.
  • void logData() - Sends DC voltage value to the uart terminal.

 

Other mikroE Libraries used in the example:

  • Conversions
  • I2C Library
  • UART Library

Additional notes and information

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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