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mikroSDK Library

RTD click

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Author: MikroElektronika Team

Last Updated: 2018-05-17

Category: Measurement

Downloaded: 920 times

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RTD click is based on MAX31865 resistance to digital converter from Maxim Integrated, optimized for platinum resistance temperature detectors, or RTD. The click uses the PT100 type platinum probe for temperature measurement.

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mikroSDK Library Blog

RTD Click

RTD Click

Native view of the RTD Click board.

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RTD click

RTD click

Front and back view of the RTD click board.

View full image

Library Description

This library contains functions for basic reading and writing of the click's registers, as well as temperature conversion function that can convert raw data into degrees Celsius.

Key functions:

  • void rtd_writeRegister(uint8_t regAddress, uint8_t writeData) - Writes data into a register
  • uint16_t rtd_readTemperature() - Reads temperature from temperature registers
  • float rtd_convertTemperature(uint16_t inputData, uint16_t referentResistance) - Converts raw data to degrees Celsius

Examples Description

The application is composed of three sections:

  • System Initialization - Initializes SPI peripheral, CS pin, and UART logger
  • Application Initialization - Initializes RTD click driver, and sets the proper configuration mode for 3-wire RTD
  • Application Task (code snippet) - Measures temperature, converts the data to Celsius degrees, and outputs them via UART. The conversion function also accepts the value for the resistance, which is used for the proper compensation, depending on the used referent voltage resistor. 
uint16_t readValue;
    float convertedValue;
    char testTxt [20];

    readValue = rtd_readTemperature();
    convertedValue = rtd_convertTemperature(readValue, _RTD_REF_RESISTANCE_470);

    floatToStr(convertedValue, testTxt);
    mikrobus_logWrite("Current temperature: ", _LOG_TEXT );
    mikrobus_logWrite(testTxt, _LOG_LINE );

    delay_ms(1000);


Other mikroE Libraries used in this example:

  • UART
  • Conversions
  • C_string

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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