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mikroSDK Library

Proximity 9 click

Rating:

5

Author: MikroElektronika Team

Last Updated: 2019-02-20

Category: Proximity

Downloaded: 267 times

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License: MIT license  

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.

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mikroSDK Library Blog

Proximity 9 click

Proximity 9 click

Native view of the Proximity 9 click board.

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Proximity 9 click

Proximity 9 click

Front and back view of the Proximity 9 click board.

View full image

Library Description

This library allows user to get Proximity output data in the desired resolution and ALS output data calculated to lux. User also can configure the ALS sensitivity by changing the ALS integration time. This library also offers a choice to check a desired interrupt flags to be sure which interrupt is generated. For more details check documentation.

Key functions:

  • T_PROXIMITY9_RETVAL proximity9_readReg( uint8_t regAddr, uint16_t *dataOut ) - This function reads a 16bit data from the desired register.
  • T_PROXIMITY9_RETVAL proximity9_writeReg( uint8_t regAddr, uint16_t dataIn ) - This function writes a 16bit data to the desired register.
  • float proximity9_get_ALS_lux( void ) - This function allows user to get the ALS value calculated to lux.

Examples description

The application is composed of the three sections :

  • System Initialization - Initializes peripherals and pins.
  • Application Initialization - Initializes I2C interface and performs a device configurations.
  • Application Task - (code snippet) - Performs a data reading and interrupt flag checking. Allows data and interrupt flags messages to be showed on the uart terminal. 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.
void applicationTask()
{
    als_data = proximity9_get_ALS_lux();
    proximity9_readReg( _PROXIMITY9_PS_DATA_REG, &prox_data );
    int_check = proximity9_check_int_flag( _PROXIMITY9_PS_IF_CLOSE_FLAG | _PROXIMITY9_PS_IF_AWAY_FLAG );
    
    FloatToStr( als_data, text );
    mikrobus_logWrite( "** ALS : ", _LOG_TEXT );
    mikrobus_logWrite( text, _LOG_TEXT );
    mikrobus_logWrite( " lux", _LOG_LINE );
    
    WordToStr( prox_data, text );
    mikrobus_logWrite( "** PROXIMITY : ", _LOG_TEXT );
    mikrobus_logWrite( text, _LOG_LINE );
    
    if (int_check == _PROXIMITY9_PS_IF_CLOSE_FLAG)
    {
        mikrobus_logWrite( "** Object is close!", _LOG_LINE );
        mikrobus_logWrite( "************************************", _LOG_LINE );
        Sound_Play( 1200, 50 );
        Delay_ms( 50 );
        Sound_Play( 1200, 50 );
        Delay_ms( 50 );
        Sound_Play( 1200, 50 );
    }
    if (int_check == _PROXIMITY9_PS_IF_AWAY_FLAG)
    {
        mikrobus_logWrite( "** Object is away!", _LOG_LINE );
        mikrobus_logWrite( "************************************", _LOG_LINE );
        Sound_Play( 1100, 100 );
        Delay_ms( 50 );
        Sound_Play( 1100, 100 );
    }
    if (int_check == _PROXIMITY9_INT_CLEARED)
    {
        mikrobus_logWrite( "************************************", _LOG_LINE );
        Delay_ms( 200 );
    }
}

Other mikroE Libraries used in the example:

  • I2C
  • UART
  • Conversions
  • Sound

Additional notes and informations

Depending on the development board you are using, you may need USB UART clickUSB 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.

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