Ambient 12 click

Ambient 12 Click is a compact add-on board used to sense the amount of the present ambient light. This board features the BH1620FVC, an analog current-output type ambient light sensor from Rohm Semiconductor.

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Click library

• Author : Stefan Filipovic
• Date : Jul 2021.
• Type : ADC type

Software Support

We provide a library for the Ambient12 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 Ambient12 Click driver.

Standard key functions :

• ambient12_cfg_setup Config Object Initialization function.

  void ambient12_cfg_setup ( ambient12_cfg_t *cfg );

• ambient12_init Initialization function.

  err_t ambient12_init ( ambient12_t *ctx, ambient12_cfg_t *cfg );

Example key functions :

• ambient12_read_adc_voltage This function reads raw 12-bit ADC data and converts it to voltage by using I2C serial interface.

  err_t ambient12_read_adc_voltage ( ambient12_t *ctx, float *voltage );

• ambient12_voltage_to_lux This function calculates illuminance (lux) based on the voltage input.

  int32_t ambient12_voltage_to_lux ( ambient12_t *ctx, float voltage );

• ambient12_set_gain_mode This function sets the gain mode.

  void ambient12_set_gain_mode ( ambient12_t *ctx, uint8_t mode );

Example Description

This example demonstrates the use of Ambient 12 click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and sets the gain mode to M-Gain which can detect the illuminance of up to 10000 lux.

void application_init ( void )
{
    log_cfg_t log_cfg;              /**< Logger config object. */
    ambient12_cfg_t ambient12_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 );
    Delay_ms ( 100 );
    log_info( &logger, " Application Init " );

    // Click initialization.
    ambient12_cfg_setup( &ambient12_cfg );
    AMBIENT12_MAP_MIKROBUS( ambient12_cfg, MIKROBUS_1 );
    if ( ADC_ERROR == ambient12_init( &ambient12, &ambient12_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    ambient12_set_gain_mode ( &ambient12, AMBIENT12_MODE_M_GAIN );
    log_printf( &logger, " M-Gain mode selected.\r\n Up to 10000 lux can be measured.\r\n" );
    log_info( &logger, " Application Task " );
}

Application Task

Reads the ADC voltage and then calculates the illuminance from it. The calculated value of illuminance in lux is being displayed on the USB UART approximately once per second.

void application_task ( void )
{
    float voltage = 0;

    if ( AMBIENT12_OK == ambient12_read_adc_voltage ( &ambient12, &voltage ) )
    {
        log_printf( &logger, " Illuminance : %ld Lux\r\n\n", ambient12_voltage_to_lux( &ambient12, voltage ) );
    }

    Delay_ms ( 1000 );
}

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.Ambient12

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.