Thermo K 3 Click

Thermo K 3 Click is a compact add-on board that provides accurate temperature measurements with a thermocouple probe. This board features the MAX6675, a cold-junction-compensated K-thermocouple-to-digital converter from Analog Devices. With the versatile type-K probe, this board enables precise temperature measurements of up to +700°C in 12-bit (0.25°C) resolution. This board can measure temperatures as high as +1024°C but with less precision. It features cold-junction compensation sensing and correction and open thermocouple detection.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Apr 2023.
• Type : SPI type

Software Support

We provide a library for the Thermo K 3 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 Thermo K 3 Click driver.

Standard key functions :

• thermok3_cfg_setup Config Object Initialization function.

  void thermok3_cfg_setup ( thermok3_cfg_t *cfg );

• thermok3_init Initialization function.

  err_t thermok3_init ( thermok3_t *ctx, thermok3_cfg_t *cfg );

Example key functions :

• thermok3_read_data This function reads a raw data output by using the SPI serial interface.

  err_t thermok3_read_data ( thermok3_t *ctx, uint16_t *data_out );

• thermok3_read_temperature This function reads a raw data output and converts it to temperature in Celsius.

  err_t thermok3_read_temperature ( thermok3_t *ctx, float *temperature );

Example Description

This example demonstrates the use of Thermo K 3 Click board by reading and displaying the temperature measurements.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    thermok3_cfg_t thermok3_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.
    thermok3_cfg_setup( &thermok3_cfg );
    THERMOK3_MAP_MIKROBUS( thermok3_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == thermok3_init( &thermok3, &thermok3_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

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

Application Task

Reads the temperature measurement in Celsius and displays the results on the USB UART approximately once per second. If there's no thermocouple type-K probe inserted an appropriate message will be displayed instead.

void application_task ( void )
{
    float temperature = 0;
    err_t error_flag = thermok3_read_temperature ( &thermok3, &temperature );
    if ( THERMOK3_OK == error_flag )
    {
        log_printf( &logger, " Temperature: %.2f C\r\n\n", temperature );
    }
    else if ( THERMOK3_OPEN_THERMOCOUPLE == error_flag )
    {
        log_printf( &logger, " NO thermocouple input\r\n\n" );
    }
    Delay_ms ( 1000 );
}

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.ThermoK3

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.