Thermo 19 Click

Thermo 19 Click is a compact add-on board that provides an accurate temperature measurement. This board features the MAX31825, a temperature sensor that provides 8-bit to 12-bit Celsius temperature measurements with better than ±1.75°C from -45°C to +145°C from Analog Devices. It has a unique 64-bit serial code stored in an on-chip ROM, an alarm output for detection of temperature faults, temperature resolution selection from 8 to 12 bits, and it allows temperature conversion to 10-bit digital word in a period of 80ms (max).

Click Product page

Click library

• Author : Nikola Citakovic
• Date : Feb 2022.
• Type : PWM type

Software Support

We provide a library for the Thermo 19 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 19 Click driver.

Standard key functions :

• thermo19_cfg_setup Config Object Initialization function.

  void thermo19_cfg_setup ( thermo19_cfg_t *cfg );

• thermo19_init Initialization function.

  err_t thermo19_init ( thermo19_t *ctx, thermo19_cfg_t *cfg );

• thermo19_default_cfg Click Default Configuration function.

  err_t thermo19_default_cfg ( thermo19_t *ctx );

Example key functions :

• thermo19_write_scratchpad This function writes the temperature thresholds and configuration byte to the scratchpad.

  err_t thermo19_write_scratchpad ( thermo19_t *ctx, uint16_t temp_high, uint16_t temp_low, uint8_t config );

• thermo19_read_scratchpad This function reads the scratchpad bytes.

  err_t thermo19_read_scratchpad ( thermo19_t *ctx, uint8_t *scratchpad );

• thermo19_read_temperature This function reads the temperature value in Celsius.

  err_t thermo19_read_temperature ( thermo19_t *ctx, float *temperature );

Example Description

This example demonstrates the use of Thermo 19 Click board by reading and displaying the temperature in Celsius.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    thermo19_cfg_t thermo19_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.
    thermo19_cfg_setup( &thermo19_cfg );
    THERMO19_MAP_MIKROBUS( thermo19_cfg, MIKROBUS_1 );
    if ( ONE_WIRE_ERROR == thermo19_init( &thermo19, &thermo19_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( THERMO19_ERROR == thermo19_default_cfg ( &thermo19 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

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

Application Task

Reads and displays the temperature measured by the Click board on the USB UART approximately every 400ms as this matches the required conversion time for 12-bit temperature resolution.

void application_task ( void )
{
    float temperature;
    if ( THERMO19_OK == thermo19_read_temperature ( &thermo19, &temperature ) )
    {
        log_printf( &logger, " Temperature: %.2f C\r\n\n", temperature );
    }
}

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.Thermo19

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.