README.md

---

VAV Press Click

VAV Press 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 : Nenad Filipovic
• Date : Mar 2021.
• Type : I2C type

Software Support

Example Description

This library contains API for the Vav Press Click driver. This demo application shows an example of differential pressure and temperature measurement.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.VavPress

Example Key Functions

• vavpress_cfg_setup Config Object Initialization function.

void vavpress_cfg_setup ( vavpress_cfg_t *cfg );

• vavpress_init Initialization function.

err_t vavpress_init ( vavpress_t *ctx, vavpress_cfg_t *cfg );

• vavpress_default_cfg Click Default Configuration function.

void vavpress_default_cfg ( vavpress_t *ctx );

• vavpress_set_default_sensor_param VAV Press set default sensor parameter function.

err_t vavpress_set_default_sensor_param ( vavpress_t *ctx, vavpress_sensor_param_data_t *param_data );

• vavpress_get_dif_press_and_temp VAV Press get differential pressure and temperature function.

err_t vavpress_get_dif_press_and_temp ( vavpress_t *ctx, vavpress_sensor_param_data_t *param_data, float *diff_press, float *temperature );

• vavpress_retrieve_electronic_signature VAV Press retrieve electronic signature function.

err_t vavpress_retrieve_electronic_signature ( vavpress_t *ctx, vavpress_el_signature_data_t *el_signature_data );

Application Init

Initialization of I2C module and log UART. After driver initialization and default settings, the app display retrieve the electronic signature and set the sensor parameters data.

void application_init ( void ) 
{
    log_cfg_t log_cfg;            /**< Logger config object. */
    vavpress_cfg_t vavpress_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_printf( &logger, "\r\n" );
    log_info( &logger, " Application Init " );

    // Click initialization.

    vavpress_cfg_setup( &vavpress_cfg );
    VAVPRESS_MAP_MIKROBUS( vavpress_cfg, MIKROBUS_1 );
    err_t init_flag = vavpress_init( &vavpress, &vavpress_cfg );
    if ( init_flag == I2C_MASTER_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    vavpress_default_cfg ( &vavpress );
    log_info( &logger, " Application Task " );
    Delay_ms ( 100 );
    
    vavpress_retrieve_electronic_signature( &vavpress, &el_signature_data );
    Delay_ms ( 100 );

    log_printf( &logger, "--------------------------------\r\n" );
    log_printf( &logger, " Firmware Version : %.3f        \r\n", el_signature_data.firmware_version );
    log_printf( &logger, " Pressure Range   : %d Pa       \r\n", el_signature_data.pressure_range );
    log_printf( &logger, " Part #           : %.11s       \r\n", el_signature_data.part_number );
    log_printf( &logger, " Lot #            : %.7s        \r\n", el_signature_data.lot_number );
    log_printf( &logger, " Output Type      : %c          \r\n", el_signature_data.output_type );
    log_printf( &logger, " Scale Factor     : %d          \r\n", el_signature_data.scale_factor );
    log_printf( &logger, " Calibration ID   : %.2s        \r\n", el_signature_data.calibration_id );
    log_printf( &logger, " Week number      : %d          \r\n", el_signature_data.week_number );
    log_printf( &logger, " Year number      : %d          \r\n", el_signature_data.year_number );
    log_printf( &logger, " Sequence number  : %d          \r\n", el_signature_data.sequence_number );
    log_printf( &logger, "--------------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    param_data.scale_factor_temp = 72;
    param_data.scale_factor_press = el_signature_data.scale_factor;
    param_data.readout_at_known_temperature = 50;
    param_data.known_temperature_c = 24.0;
    Delay_ms ( 100 );
}

Application Task

This is an example that shows the use of a Vav Press Click board™. Logs pressure difference value [ Pa ] and temperature [ degree Celsius ] value. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( void ) 
{   
    err_t error_flag = vavpress_get_dif_press_and_temp( &vavpress, &param_data, &diff_press, &temperature );
    if ( error_flag == VAVPRESS_OK ) {
        log_printf( &logger, " Diff. Pressure    : %.4f Pa\r\n", diff_press );
        log_printf( &logger, " Temperature       : %.4f C\r\n", temperature );
        log_printf( &logger, "--------------------------------\r\n" );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    } else {
        log_error( &logger, " Communcation Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
}

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.

---