Monitor and control harmful pathogens with GUVC-T21GH and PIC18F2455 for safer and cleaner environments
UVC: Lighting the way to health and safety
Published Jan 23, 2024
Click board™
UVC Click
Dev. board
Curiosity HPC
Compiler
NECTO Studio
MCU
PIC18F2455
Upgrade health and safety standards with our UVC sensing solution, providing real-time data for informed decision-making
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Hardware Overview
How does it work?
UVC Click is based on GUVC-T21GH, an ultraviolet sensor from GenUV, capable of measuring UVC spectrum from 220nm up to 280nm and light intensity from 0mW/cm² up to 9.3mW/cm². Light intensity is converted into a digital value using MCP3221, a successive approximation A/D converter (ADC) with a 12-bit resolution. Communication to the MCP3221 is performed using a 2-wire, I2C-compatible interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are available with the device. An on-chip conversion clock enables independent timing for the I2C and
conversion clocks. To get reliable readings from the sensor, ADC power and voltage reference are supplied from MCP1501T-33E/RW, a buffered voltage reference with 3.3V output capable of sourcing up to 20mA of current as a low-drift bandgap-based reference. The bandgap uses chopper-based amplifiers, effectively reducing the drift to zero. The second way of reading output voltage from the sensor is by placing a 0-ohm resistor on the JP2 position labeled on the PCB and reading an analog value from the AN pin on mikroBUS™. This way, you can rely on external
voltage reference and ADC with other desired specifications for your application and measure light power intensity up to 14.1 mW/cm². This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
Features overview
Development board
Curiosity HPC, standing for Curiosity High Pin Count (HPC) development board, supports 28- and 40-pin 8-bit PIC MCUs specially designed by Microchip for the needs of rapid development of embedded applications. This board has two unique PDIP sockets, surrounded by dual-row expansion headers, allowing connectivity to all pins on the populated PIC MCUs. It also contains a powerful onboard PICkit™ (PKOB), eliminating the need for an external programming/debugging tool, two mikroBUS™ sockets for Click board™ connectivity, a USB connector, a set of indicator LEDs, push button switches and a variable potentiometer. All
these features allow you to combine the strength of Microchip and Mikroe and create custom electronic solutions more efficiently than ever. Each part of the Curiosity HPC development board contains the components necessary for the most efficient operation of the same board. An integrated onboard PICkit™ (PKOB) allows low-voltage programming and in-circuit debugging for all supported devices. When used with the MPLAB® X Integrated Development Environment (IDE, version 3.0 or higher) or MPLAB® Xpress IDE, in-circuit debugging allows users to run, modify, and troubleshoot their custom software and hardware
quickly without the need for additional debugging tools. Besides, it includes a clean and regulated power supply block for the development board via the USB Micro-B connector, alongside all communication methods that mikroBUS™ itself supports. Curiosity HPC development board allows you to create a new application in just a few steps. Natively supported by Microchip software tools, it covers many aspects of prototyping thanks to many number of different Click boards™ (over a thousand boards), the number of which is growing daily.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
24
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Curiosity HPC as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for UVC Click driver.
Key functions:
uvc_read_raw_data- This function reads 12bit raw datauvc_get_voltage- This function calculate voltage from raw datauvc_calculate_power- This function calculate power from voltage.
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief Uvc Click example
*
* # Description
* This click is capable of measuring UVC spectrum in the range of 220nm up to 280nm and light
* intensity from 0mW/cm² up to 9.3mW/cm². With high sensitivity and good solar blindness,
* it can be used for monitoring sterilization lamps.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver.
*
* ## Application Task
* Reads sensor raw data and calculates voltage and power of UVC light.
* The measured values will be displayed on the USB UART every 1500 ms.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "uvc.h"
// ------------------------------------------------------------------ VARIABLES
static uvc_t uvc;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
uvc_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.
uvc_cfg_setup( &cfg );
UVC_MAP_MIKROBUS( cfg, MIKROBUS_1 );
uvc_init( &uvc, &cfg );
}
void application_task ( void )
{
uint16_t raw_data;
float voltage;
float power;
raw_data = uvc_read_raw_data( &uvc );
log_printf( &logger, "Raw data: %d\r\n", raw_data );
voltage = uvc_get_voltage( &uvc );
log_printf( &logger, "Voltage: %.4f mV\r\n", voltage );
power = uvc_calculate_power( voltage );
log_printf( &logger, "Power: %.4f mW/cm2\r\n", power );
log_printf( &logger, "----------------------\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 500 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
/*!
* \file
* \brief Uvc Click example
*
* # Description
* This click is capable of measuring UVC spectrum in the range of 220nm up to 280nm and light
* intensity from 0mW/cm² up to 9.3mW/cm². With high sensitivity and good solar blindness,
* it can be used for monitoring sterilization lamps.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver.
*
* ## Application Task
* Reads sensor raw data and calculates voltage and power of UVC light.
* The measured values will be displayed on the USB UART every 1500 ms.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "uvc.h"
// ------------------------------------------------------------------ VARIABLES
static uvc_t uvc;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
uvc_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.
uvc_cfg_setup( &cfg );
UVC_MAP_MIKROBUS( cfg, MIKROBUS_1 );
uvc_init( &uvc, &cfg );
}
void application_task ( void )
{
uint16_t raw_data;
float voltage;
float power;
raw_data = uvc_read_raw_data( &uvc );
log_printf( &logger, "Raw data: %d\r\n", raw_data );
voltage = uvc_get_voltage( &uvc );
log_printf( &logger, "Voltage: %.4f mV\r\n", voltage );
power = uvc_calculate_power( voltage );
log_printf( &logger, "Power: %.4f mW/cm2\r\n", power );
log_printf( &logger, "----------------------\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 500 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
/*!
* \file
* \brief Uvc Click example
*
* # Description
* This click is capable of measuring UVC spectrum in the range of 220nm up to 280nm and light
* intensity from 0mW/cm² up to 9.3mW/cm². With high sensitivity and good solar blindness,
* it can be used for monitoring sterilization lamps.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver.
*
* ## Application Task
* Reads sensor raw data and calculates voltage and power of UVC light.
* The measured values will be displayed on the USB UART every 1500 ms.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "uvc.h"
// ------------------------------------------------------------------ VARIABLES
static uvc_t uvc;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
uvc_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.
uvc_cfg_setup( &cfg );
UVC_MAP_MIKROBUS( cfg, MIKROBUS_1 );
uvc_init( &uvc, &cfg );
}
void application_task ( void )
{
uint16_t raw_data;
float voltage;
float power;
raw_data = uvc_read_raw_data( &uvc );
log_printf( &logger, "Raw data: %d\r\n", raw_data );
voltage = uvc_get_voltage( &uvc );
log_printf( &logger, "Voltage: %.4f mV\r\n", voltage );
power = uvc_calculate_power( voltage );
log_printf( &logger, "Power: %.4f mW/cm2\r\n", power );
log_printf( &logger, "----------------------\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 500 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
