Thermo 29 Click

Thermo 29 Click is a compact add-on board for accurate temperature measurements. This board features the TMP126, a high-accuracy SPI-configurable digital temperature sensor from Texas Instruments. The TMP126 consists of an internal thermal BJT factory-calibrated sensor, 14-bit ADC, and a digital signal processor, offering a high accuracy of ±0.25°C and a temperature resolution of 0.03125°C per LSB. It also has a programmable alarm function that outputs an interrupt signal to the MCU when a specific temperature event occurs.

Click Product page

Click library

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

Software Support

We provide a library for the Thermo 29 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 29 Click driver.

Standard key functions :

• thermo29_cfg_setup Config Object Initialization function.

  void thermo29_cfg_setup ( thermo29_cfg_t *cfg );

• thermo29_init Initialization function.

  err_t thermo29_init ( thermo29_t *ctx, thermo29_cfg_t *cfg );

• thermo29_default_cfg Click Default Configuration function.

  err_t thermo29_default_cfg ( thermo29_t *ctx );

Example key functions :

• thermo29_read_unique_id This function reads the device unique ID words (6 bytes in total).

  err_t thermo29_read_unique_id ( thermo29_t *ctx, uint16_t *unique_id );

• thermo29_get_alert_pin This function returns the alert pin logic state.

  uint8_t thermo29_get_alert_pin ( thermo29_t *ctx );

• thermo29_read_temperature This function reads the temperature measurement in degrees Celsius.

  err_t thermo29_read_temperature ( thermo29_t *ctx, float *temperature );

Example Description

This example demonstrates the use of Thermo 29 Click board by reading and displaying the temperature measurements.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger, and performs the Click default configuration which enables continuous conversion and sets the conversion rate to 1 Hz with a data ready flag enabled on the alert pin. After that, reads and displays the device 48-bit unique ID.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    thermo29_cfg_t thermo29_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.
    thermo29_cfg_setup( &thermo29_cfg );
    THERMO29_MAP_MIKROBUS( thermo29_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == thermo29_init( &thermo29, &thermo29_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( THERMO29_ERROR == thermo29_default_cfg ( &thermo29 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    uint16_t unique_id[ 3 ];
    if ( THERMO29_OK == thermo29_read_unique_id ( &thermo29, unique_id ) )
    {
        log_printf ( &logger, " Device Unique ID: 0x%.2X%.2X%.2X\r\n", 
                     unique_id[ 0 ], unique_id[ 1 ], unique_id[ 2 ] );
    }

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

Application Task

Waits for the data ready alert flag, then reads the temperature measurement in Celsius and displays the results on the USB UART approximately once per second.

void application_task ( void )
{
    float temperature;
    // Wait for the data ready alert flag
    while ( thermo29_get_alert_pin ( &thermo29 ) );

    if ( ( THERMO29_OK == thermo29_clear_alert_status ( &thermo29 ) ) && 
         ( THERMO29_OK == thermo29_read_temperature ( &thermo29, &temperature ) ) )
    {
        log_printf ( &logger, " Temperature: %.2f degC\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.Thermo29

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.