Proximity 9 Click

Proximity 9 Click is a very accurate and reliable proximity sensing (PS) and ambient light sensing (ALS) device, equipped with the VCNL4040, an integrated PS and ALS sensor which features the Filtron™ technology.

Click Product page

Click library

• Author : MikroE Team
• Date : Dec 2019.
• Type : I2C type

Software Support

We provide a library for the Proximity9 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Proximity9 Click driver.

Standard key functions :

• Config Object Initialization function.

  void proximity9_cfg_setup ( proximity9_cfg_t *cfg );

• Initialization function.

  PROXIMITY9_RETVAL proximity9_init ( proximity9_t ctx, proximity9_cfg_t cfg );

• Click Default Configuration function.

  void proximity9_default_cfg ( proximity9_t *ctx );

Example key functions :

• INT Pin Check function

  uint8_t proximity9_check_int_pin ( proximity9_t *ctx );

• INT Flag Check function

  uint8_t proximity9_check_int_flag ( proximity9_t *ctx, uint8_t bit_mask );

• ALS Get function

  float proximity9_get_als_lux ( proximity9_t *ctx );

Examples Description

This application is proximity sensing (PS) and ambient light sensing (ALS) device.

The demo application is composed of two sections :

Application Init

Initializes I2C interface and performs a device configurations.

void application_init ( void )
{
    log_cfg_t log_cfg;
    proximity9_cfg_t cfg;

    /** 
     * 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.

    proximity9_cfg_setup( &cfg );
    PROXIMITY9_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    proximity9_init( &proximity9, &cfg );

    proximity9_default_cfg( &proximity9 );

    log_printf( &logger, "** Proximity 9 is initialized ** \r\n" );
    log_printf( &logger, "************************************ \r\n" );
    Delay_ms ( 300 );
}

Application Task

Performs a data reading and interrupt flag checking. Allows data and interrupt flags messages to be showed on the uart terminal.

void application_task ( )
{
    uint8_t int_check;
    uint16_t prox_data;
    float als_data;
    uint8_t temp;

    als_data = proximity9_get_als_lux( &proximity9 );
    proximity9_read_register( &proximity9, PROXIMITY9_PS_DATA_REG, &prox_data );
    temp = PROXIMITY9_PS_IF_CLOSE_FLAG | PROXIMITY9_PS_IF_AWAY_FLAG;
    int_check = proximity9_check_int_flag( &proximity9, temp );

    log_printf( &logger, "** ALS: %.2f lux \r\n", als_data );
    log_printf( &logger, "** PROXIMITY: %d \r\n", prox_data );

    if ( int_check == PROXIMITY9_PS_IF_CLOSE_FLAG )
    {
        log_printf( &logger, "** Object is close! \r\n" );
        log_printf( &logger, "************************************ \r\n" );
        Delay_ms ( 200 );
    }
    if ( int_check == PROXIMITY9_PS_IF_AWAY_FLAG )
    {
        log_printf( &logger, "** Object is away!\r\n" );
        log_printf( &logger, "************************************ \r\n" );
        Delay_ms ( 200 );
    }
    if ( int_check == PROXIMITY9_INT_CLEARED )
    {
        log_printf( &logger, "************************************ \r\n" );
        Delay_ms ( 200 );
    }
}  

Note

The ALS sensitivity depends on the ALS integration time setting. The longer integration time has higher sensitivity. The Proximity (PS) output data can be set to 12-bit or 16-bit resolution.

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Proximity9

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.