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Multimeter Click

• CIC Prefix : MULTIMETER
• Author : Djordje Rosic
• Verison : 1.0.0
• Date : jul 2018.

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Software Support

We provide a library for the Multimeter Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Library Description

Library contains calibration function, to be used on startup for more accurate readings, as well as 4 functions that measure Voltage, Current, Resistance and Capacitance.Calibration should be performed at startup when all measurement leads are disconnected.

Key functions :

• float multimeter_measureU() - This function measures voltage, and returns the value in millivolts.
• float multimeter_measureR() - This function measures resistance, and returns the value in ohms.
• float multimeter_measureC() - This function measures capacitance, and returns the value in nanofarads.
• float multimeter_measureI() - This function measures current, and returns the value in milliamperes.

Examples Description

The application is composed of three sections :

• System Initialization - Initializes pin control, spi peripheral and logger.
• Application Initialization - Initializes the driver, and performs calibration.
• Application Task (Code snippet) - Outputs read values.

    char text[20];
    float value = 0;
    value = multim_measureR();
    FloatToStr(value,text);
    mikrobus_logWrite("R = ",_LOG_TEXT);
    mikrobus_logWrite(text,_LOG_TEXT);
    mikrobus_logWrite("  Ohms",_LOG_LINE);

    value = multim_measureU();
    FloatToStr(value,text);
    mikrobus_logWrite("U = ",_LOG_TEXT);
    mikrobus_logWrite(text,_LOG_TEXT);
    mikrobus_logWrite("  mV",_LOG_LINE);


    value = multim_measureI();
    FloatToStr(value,text);
    mikrobus_logWrite("I = ",_LOG_TEXT);
    mikrobus_logWrite(text,_LOG_TEXT);
    mikrobus_logWrite("  mA",_LOG_LINE);


    value = multim_measureC();
    FloatToStr(value,text);
    mikrobus_logWrite("C = ",_LOG_TEXT);
    mikrobus_logWrite(text,_LOG_TEXT);
    mikrobus_logWrite("  nF",_LOG_LINE);

    mikrobus_logWrite("-------------------",_LOG_LINE);
    Delay_ms( 1000 );

The full application code, and ready to use projects can be found on our LibStock page.

Other mikroE Libraries used in the example:

• Conversions
• C_String
• UART

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. 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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