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TempHum 22 Click

TempHum 22 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Click Library

  • Author : Stefan Filipovic
  • Date : Aug 2022.
  • Type : I2C type

Software Support

Example Description

This example demonstrates the use of Temp & Hum 22 Click board by reading the temperature and humidity data.

Example Libraries

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.TempHum22

Example Key Functions

  • temphum22_cfg_setup Config Object Initialization function.
void temphum22_cfg_setup ( temphum22_cfg_t *cfg );
  • temphum22_init Initialization function.
err_t temphum22_init ( temphum22_t *ctx, temphum22_cfg_t *cfg );
  • temphum22_soft_reset This function performs the software reset by sending the soft reset command.
err_t temphum22_soft_reset ( temphum22_t *ctx );
  • temphum22_read_serial_num This function reads the 4-bytes unique serial number by using I2C serial interface.
err_t temphum22_read_serial_num ( temphum22_t *ctx, uint32_t *serial_num );
  • temphum22_read_measurement_high_precision This function reads the temperature and humidity measurements with high precision.
err_t temphum22_read_measurement_high_precision ( temphum22_t *ctx, float *temp, float *hum );

Application Init

Initializes the driver, performs the sensor software reset and then reads and displays the sensor unique serial number.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    temphum22_cfg_t temphum22_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.
    temphum22_cfg_setup( &temphum22_cfg );
    TEMPHUM22_MAP_MIKROBUS( temphum22_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == temphum22_init( &temphum22, &temphum22_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( TEMPHUM22_OK == temphum22_soft_reset ( &temphum22 ) )
    {
        log_printf ( &logger, " Software reset\r\n" );
    }
    Delay_1sec ( );
    
    uint32_t serial_num;
    if ( TEMPHUM22_OK == temphum22_read_serial_num ( &temphum22, &serial_num ) )
    {
        log_printf ( &logger, " Serial number: 0x%.8LX\r\n", serial_num );
    }
    
    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, humidity;
    if ( TEMPHUM22_OK == temphum22_read_measurement_high_precision ( &temphum22, &temperature, &humidity ) )
    {
        log_printf ( &logger, " Temperature: %.2f degC\r\n", temperature );
        log_printf ( &logger, " Humidity: %.2f %%RH\r\n\n", humidity );
        Delay_ms ( 1000 );
    }
}

Application Output

This Click board can be interfaced and monitored in two ways:

  • Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
  • UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.