Our innovative solution combines two 275nm UV-C LEDs with a green LED to provide a visual indicator, helping users identify and avoid direct exposure to potentially harmful UV-C light
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Hardware Overview
How does it work?
UVC Light Click uses two 0.7W, 275nm LEDs and one green LED that allow users to see the approximate area where UVC light is shining since these UV wavelengths are not visible to the human eye and should avoid direct exposure to the eye. UVC Light Click can be used as a disinfection tool because DNA, RNA, and proteins absorb UV light in the range of 200 nm to 300 nm. Absorption by proteins can lead to the rupture of cell walls and the organism's death. Absorption by DNA or RNA (specifically by thymine bases) is
known to cause inactivation of the DNA or RNA double helix strands by forming thymine dimers. If enough of these dimers are created in DNA, the DNA replication process is disrupted, and the cell cannot replicate. It is widely accepted that it is not necessary to kill pathogens with UV light but rather apply enough UV light to prevent the organism from replicating. The UV doses required to prevent replication are orders of magnitude lower than required to kill, making the cost of UV treatment to prevent infection commercially
viable. UVC Light Click is implementing a TPS61169 LED driver with PWM brightness control to drive LEDs in series and an MC34671 battery charger to allow charging of battery when Click board™ is inserted in the mikroBUS™ socket; CHG LED will indicate the charging in progress and will turn off once the battery charging is finished. When the PWR SEL jumper is repositioned to the right position, you can use UVC Light and click standalone if no dimming is necessary or high mobility is needed.
Features overview
Development board
Fusion for STM32 v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different 32-bit ARM® Cortex®-M based MCUs from STMicroelectronics, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, Fusion for STM32 v8 provides a fluid and immersive working experience, allowing
access anywhere and under any circumstances at any time. Each part of the Fusion for STM32 v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.
Communication options such as USB-UART, USB HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. Fusion for STM32 v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
![default](https://s3.us-west-2.amazonaws.com/dbp-cdn.mikroe.com/catalog/mcu-cards/resources/1ed98ab4-dafc-6da2-8ebd-0242ac13000b/mcu-card-for-stm32-stm32f745zg.png)
Type
8th Generation
Architecture
ARM Cortex-M7
MCU Memory (KB)
1024
Silicon Vendor
STMicroelectronics
Pin count
144
RAM (Bytes)
327680
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
![UVC Light Click Schematic schematic](https://dbp-cdn.mikroe.com/catalog/click-boards/resources/1ee790c5-910a-68fa-b25e-0242ac120009/schematic.webp)
Step by step
Project assembly
Track your results in real time
Application Output
After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.
![UART Application Output Step 1](https://dbp-cdn.mikroe.com/cms/shared-resources/1eed703a-40a0-6b58-88de-02420a00029a/UART-AO-Step-1.jpg)
Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.
![UART Application Output Step 2](https://dbp-cdn.mikroe.com/cms/shared-resources/1eed703a-eb29-62fa-ba91-02420a00029a/UART-AO-Step-2.jpg)
In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".
![UART Application Output Step 3](https://dbp-cdn.mikroe.com/cms/shared-resources/1eed703b-7543-6fbc-9c69-0242ac120003/UART-AO-Step-3.jpg)
The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.
![UART Application Output Step 4](https://dbp-cdn.mikroe.com/cms/shared-resources/1eed703c-068c-66a4-a4fc-0242ac120003/UART-AO-Step-4.jpg)
Software Support
Library Description
This library contains API for UVC Light Click driver.
Key functions:
uvclight_pwm_start
- This function starts PWM moduleuvclight_set_duty_cycle
- This function sets the PWM duty cycleuvclight_pwm_stop
- This function stops PWM module.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file
* @brief UvcLight Click example
*
* # Description
* This click has ultraviolet LEDs with 275nm wavelength. UVC radiation refers to wavelengths
* shorter than 280 nm. Because of the spectral sensitivity of DNA, only the UVC region
* demonstrates significant germicidal properties.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver.
*
* ## Application Task
* Increases and decreases the pwm duty cycle.
* Results are being sent to the Usart Terminal where you can track their changes.
*
* CAUTION! High intensity UV Light - avoid eye and skin exposure. Avoid looking direclty at light!
*
* @author Nikola Peric
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "uvclight.h"
// ------------------------------------------------------------------ VARIABLES
static uvclight_t uvclight;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
uvclight_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.
uvclight_cfg_setup( &cfg );
UVCLIGHT_MAP_MIKROBUS( cfg, MIKROBUS_1 );
uvclight_init( &uvclight, &cfg );
uvclight_set_duty_cycle ( &uvclight, 0.0 );
uvclight_pwm_start( &uvclight );
Delay_ms( 100 );
log_info( &logger, "---- Application Task ----" );
}
void application_task ( void )
{
static int8_t duty_cnt = 1;
static int8_t duty_inc = 1;
float duty = duty_cnt / 10.0;
uvclight_set_duty_cycle ( &uvclight, duty );
log_printf( &logger, "Duty: %d%%\r\n", ( uint16_t )( duty_cnt * 10 ) );
Delay_ms( 500 );
if ( 10 == duty_cnt )
{
duty_inc = -1;
}
else if ( 0 == duty_cnt )
{
log_printf( &logger, "Cooldown 2 SEC\r\n");
Delay_ms( 2000 );
duty_inc = 1;
}
duty_cnt += duty_inc;
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END