UV 4 Click

UV 4 Click is a powerful Ultra Violet (UV) sensing device and Ambient Light Sensor (ALS) Click board, featuring a sensor with a very wide dynamic range of detectable light intensity, across two ADC range settings.

Click Product page

Click library

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

Software Support

We provide a library for the UV4 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 UV4 Click driver.

Standard key functions :

• Config Object Initialization function.

  void uv4_cfg_setup ( uv4_cfg_t *cfg );

• Initialization function.

  UV4_RETVAL uv4_init ( uv4_t ctx, uv4_cfg_t cfg );

• Click Default Configuration function.

  void uv4_default_cfg ( uv4_t *ctx );

Example key functions :

• This function write one byte of data to given address.

  UV4_RETVAL uv4_write_reg ( uv4_t* ctx, const uint8_t reg_address, const uint8_t transfer_data );

• This function reads determined number of bytes from given address.

  UV4_RETVAL uv4_read_reg ( uv4_t ctx, uint8_t reg_address, uint8_t data_out, uint8_t inc_en, uint8_t n_bytes );

• This function writes one byte of data in parameter table.

  UV4_RETVAL uv4_write_param_data ( uv4_t* ctx, uint8_t param_address, uint8_t transfer_data );

Examples Description

Reads all configured measurements from selected channels and logs results every 500ms.

The demo application is composed of two sections :

Application Init

Initializes driver, performs reset command and enables selected channels.

void application_init ( void )
{
    log_cfg_t log_cfg;
    uv4_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.

    uv4_cfg_setup( &cfg );
    UV4_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    uv4_init( &uv4, &cfg );
    uv4_default_cfg( &uv4 );
}

Application Task

Reads all configured measurements from selected channels and logs results every 500ms.

void application_task ( void )
{
    uint8_t cnt;
    uint8_t pom = 1;
    uint32_t data_r[ 6 ];

    uv4_read_measurements( &uv4, &data_r[ 0 ] );

    for ( cnt = 0; cnt < 6; cnt++ )
    {
        if ( uv4.config_byte & pom )
        {
            switch ( uv4.optical_data[ cnt ] )
            {
                case UV4_OPT_FUNC_SMALL_IR:
                {
                    log_printf( &logger, "Small IR: " );
                    break;
                }
                case UV4_OPT_FUNC_MEDIUM_IR:
                {
                    log_printf( &logger, "Medium IR: " );
                    break;
                }
                case UV4_OPT_FUNC_LARGE_IR:
                {
                    log_printf( &logger, "Large IR: " );
                    break;
                }
                case UV4_OPT_FUNC_WHITE:
                {
                    log_printf( &logger, "White : " );
                    break;
                }
                case UV4_OPT_FUNC_LARGE_WHITE:
                {
                    log_printf( &logger, "Large White: " );
                    break;
                }
                case UV4_OPT_FUNC_UV:
                {
                    log_printf( &logger, "UV: " );
                    break;
                }
                case UV4_OPT_FUNC_UV_DEEP:
                {
                    log_printf( &logger, "UV-Deep: " );
                    break;
                }
                default:
                {
                    break;
                }
            }
            log_printf( &logger, "%d\r\n", data_r[ cnt ] );
        }
        pom <<= 1;
    }
    Delay_ms ( 500 );
}

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.UV4

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.