TempHum 25 Click

Temp&Hum 25 Click is a compact add-on board designed for precise temperature and humidity monitoring. This board features the SHT33-DIS-B2.5KS, a high-reliability, third-generation relative humidity and temperature sensor from Sensirion. This sensor offers exceptional accuracy and reliability, with a range of 0-100% RH and -40 to +125°C, and features ISO17025-certified calibration, CMOSens® technology, and NIST-traceability. The board supports the new Click Snap feature, allowing easy detachment of the sensor area for flexible use.

Click Product page

Click library

• Author : Stefan Filipovic
• Date : Apr 2024.
• Type : I2C type

Software Support

We provide a library for the TempHum 25 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 TempHum 25 Click driver.

Standard key functions :

• temphum25_cfg_setup Config Object Initialization function.

  void temphum25_cfg_setup ( temphum25_cfg_t *cfg );

• temphum25_init Initialization function.

  err_t temphum25_init ( temphum25_t *ctx, temphum25_cfg_t *cfg );

Example key functions :

• temphum25_read_serial_num This function reads the 4-bytes unique serial number by using I2C serial interface.

  err_t temphum25_read_serial_num ( temphum25_t *ctx, uint32_t *serial_num );

• temphum25_start_measurement This function starts the measurement by sending the selected measurement command.

  err_t temphum25_start_measurement ( temphum25_t *ctx, uint16_t meas_cmd );

• temphum25_read_measurement This function reads the temperature and humidity measurements results.

  err_t temphum25_read_measurement ( temphum25_t *ctx, float *temperature, float *humidity );

Example Description

This example demonstrates the use of TempHum 25 Click board by reading the temperature and humidity data.

The demo application is composed of two sections :

Application Init

Initializes the driver, performs the device reset, reads and displays the sensor unique serial number, and then starts the measurements with 1 MPS.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    temphum25_cfg_t temphum25_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.
    temphum25_cfg_setup( &temphum25_cfg );
    TEMPHUM25_MAP_MIKROBUS( temphum25_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == temphum25_init( &temphum25, &temphum25_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    temphum25_reset_device ( &temphum25 );

    uint32_t serial_num = 0;
    if ( TEMPHUM25_OK == temphum25_read_serial_num ( &temphum25, &serial_num ) )
    {
        log_printf ( &logger, " Serial number: 0x%.8LX\r\n", serial_num );
    }

    temphum25_start_measurement ( &temphum25, TEMPHUM25_CMD_MEAS_CONT_REP_HIGH_MPS_1 );

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

Application Task

Reads the temperature (degC) and the relative humidity (%RH) data and displays the results on the USB UART approximately once per second.

void application_task ( void )
{
    float temperature = 0;
    float humidity = 0;
    if ( TEMPHUM25_OK == temphum25_read_measurement ( &temphum25, &temperature, &humidity ) )
    {
        log_printf ( &logger, " Temperature: %.2f degC\r\n", temperature );
        log_printf ( &logger, " Humidity: %.2f %%RH\r\n\n", humidity );
        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.TempHum25

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.