UV 5 Click

UV 5 Click is a compact add-on board that can measure UV radiation. This board features the AS7331, a spectral UVA/B/C sensor from ams. The sensor can measure UVA, UVB, and UVC, which are the main types of UV rays from the UV radiation of the sunlight. It uses ADC with a high dynamic range (16… 24-bit) for measurements from low to high radiation conditions and has a high sensitivity, which makes it usable for fluorescence light conditions.

Click Product page

Click library

• Author : Stefan Ilic
• Date : Sep 2023.
• Type : I2C type

Software Support

We provide a library for the UV 5 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 UV 5 Click driver.

Standard key functions :

• uv5_cfg_setup Config Object Initialization function.

  void uv5_cfg_setup ( uv5_cfg_t *cfg );

• uv5_init Initialization function.

  err_t uv5_init ( uv5_t *ctx, uv5_cfg_t *cfg );

• uv5_default_cfg Click Default Configuration function.

  err_t uv5_default_cfg ( uv5_t *ctx );

Example key functions :

• uv5_get_rdy_pin UV 5 get READY pin state function.

  uint8_t uv5_get_rdy_pin ( uv5_t *ctx );

• uv5_sw_reset UV 5 software reset function.

  err_t uv5_sw_reset ( uv5_t *ctx );

• uv5_channel_uva_read UV 5 read raw UVA data function.

  err_t uv5_channel_uva_read ( uv5_t *ctx, uint16_t *uva_data );

Example Description

This example demonstrates the use of UV 5 Click board by measuring the light irradiance of the UVA, UVB and UVC.

The demo application is composed of two sections :

Application Init

Initializes the driver, and performs the Click default configuration.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    uv5_cfg_t uv5_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_info( &logger, " Application Init " );

    // Click initialization.
    uv5_cfg_setup( &uv5_cfg );
    UV5_MAP_MIKROBUS( uv5_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == uv5_init( &uv5, &uv5_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( UV5_ERROR == uv5_default_cfg ( &uv5 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
}

Application Task

Measuring light irradiance level by reading data from the UV 5 Click board approximately every 4 seconds and displaying it using UART Serial terminal.

void application_task ( void ) 
{
    float temp_data; 
    uint16_t uv_raw_data; 
    float uv_data; 

    if ( uv5_get_rdy_pin( &uv5 ) == 1 )
    {
        uv5_temperature_read( &uv5, &temp_data );
        log_printf( &logger, " Temp: %.2f degC\r\n", temp_data );

        uv5_channel_uva_read( &uv5, &uv_raw_data );
        uv_data = ( float ) ( ( FSRE_UVA / OUTCONV ) * uv_raw_data );
        log_printf( &logger, " UVA: %.2f uW/cm2 \r\n", uv_data );

        uv5_channel_uvb_read( &uv5, &uv_raw_data );
        uv_data = ( float ) ( ( FSRE_UVB / OUTCONV ) * uv_raw_data );
        log_printf( &logger, " UVB: %.2f uW/cm2 \r\n", uv_data );

        uv5_channel_uvc_read( &uv5, &uv_raw_data );
        uv_data = ( float ) ( ( FSRE_UVC / OUTCONV ) * uv_raw_data );
        log_printf( &logger, " UVC: %.2f uW/cm2 \r\n", uv_data );
        log_printf( &logger, " =================== \r\n" );
    }
}

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.UV5

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.