IR Sense 4 Click

IR Sense 4 Click is a compact add-on board that can be used in short-range IR sensing applications. This board features the STHS34PF80, a low-power high-sensitivity infrared (IR) sensor from STMicroelectronics. It is a sensor for presence and motion detection and can reach up to 4m without a lens for object measuring. The sensor can detect stationary objects and distinguish them from moving objects.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Jun 2023.
• Type : I2C/SPI type

Software Support

We provide a library for the IR Sense 4 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 IR Sense 4 Click driver.

Standard key functions :

• irsense4_cfg_setup Config Object Initialization function.

  void irsense4_cfg_setup ( irsense4_cfg_t *cfg );

• irsense4_init Initialization function.

  err_t irsense4_init ( irsense4_t *ctx, irsense4_cfg_t *cfg );

• irsense4_default_cfg Click Default Configuration function.

  err_t irsense4_default_cfg ( irsense4_t *ctx );

Example key functions :

• irsense4_get_presence_data IR Sense 4 get the presence detection data function.

  err_t irsense4_get_presence_data ( irsense4_t *ctx, int16_t *presence );

• irsense4_get_motion_data IR Sense 4 get the motion detection data function.

  err_t irsense4_get_motion_data ( irsense4_t *ctx, int16_t *motion );

• irsense4_get_amb_temperature IR Sense 4 get the ambient temperature function.

  err_t irsense4_get_amb_temperature ( irsense4_t *ctx, float *temperature );

Example Description

This example demonstrates the use of theIR Sense 4 Click board™, by showing parameters for detection of the presence and motion as well as ambient temperature.

The demo application is composed of two sections :

Application Init

The initialization of I2C or SPI module and log UART. After driver initialization, the app sets the default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    irsense4_cfg_t irsense4_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.
    irsense4_cfg_setup( &irsense4_cfg );
    IRSENSE4_MAP_MIKROBUS( irsense4_cfg, MIKROBUS_1 );
    err_t init_flag = irsense4_init( &irsense4, &irsense4_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( IRSENSE4_ERROR == irsense4_default_cfg ( &irsense4 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, " ------------------------\r\n" );
}

Application Task

The application checks for the human presence and motion detection and display output data, using embedded algorithms, and ambient temperature in degrees Celsius. Results are being sent to the UART Terminal, where you can track their changes.

void application_task ( void )
{ 
    static float temperature = 0.0;
    static int16_t detection_data = 0;
    static uint8_t status = 0;
    while ( IRSENSE4_OK != irsense4_wait_new_data_ready( &irsense4 ) );
    if ( IRSENSE4_OK == irsense4_get_status( &irsense4, &status ) )
    {
        if ( status & IRSENSE4_STATUS_DETECT_FLAG )
        {
            if ( ( IRSENSE4_OK == irsense4_get_presence_data( &irsense4, &detection_data ) ) && 
                 ( status & IRSENSE4_STATUS_PRES_FLAG ) )
            {
                log_printf( &logger, " Presence: %d \r\n", detection_data );
            }

            if ( ( IRSENSE4_OK == irsense4_get_motion_data( &irsense4, &detection_data ) ) && 
                 ( status & IRSENSE4_STATUS_MOT_FLAG ) )
            {
                log_printf( &logger, " Motion: %d \r\n", detection_data );
            }

            if ( IRSENSE4_OK == irsense4_get_amb_temperature( &irsense4, &temperature ) )
            {
                log_printf( &logger, " Temperature: %.2f C\r\n", temperature );
            }
            log_printf( &logger, " ------------------------\r\n" );
            Delay_ms ( 100 );
        }
    }
}

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.IRSense4

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.