Beginner
10 min

Add small, blue, readable displays to various electronic projects with JSS-3011BUB-21, TLC5947 and PIC32MZ2048EFM100

Useful for things like digital clocks, scoreboards, or any device where you need to show information clearly

UT-S 7-SEG B 2 Click with Curiosity PIC32 MZ EF

Published Feb 21, 2024

Click board™

UT-S 7-SEG B 2 Click

Dev. board

Curiosity PIC32 MZ EF

Compiler

NECTO Studio

MCU

PIC32MZ2048EFM100

Six ultra-thin displays capable of showing numbers, letters, and symbols in blue, making the information easy to read

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Hardware Overview

How does it work?

UT-S 7-SEG B 2 Click is based on the TLC5947, a constant-current sink LED driver from Texas Instruments, alongside six ultra-thin blue single-digit numeric displays, the JSS-3011BUB-21. This high-intensity and reliable blue source color device is made with Indium-Gallium-Nitride light-emitting diode conducting material. It features low current operation, high light output, excellent character appearance, and is mechanically rugged. The display can work on 5V and 3.3V and has a common anode as its internal design. It consists

of seven blue LED segments that form an 8 number and the eighth segment as a decimal point, or DP. The communication between the host MCU and the UT-S 7-SEG B 2 Click is established via two TLC5947s, 24-channel 12-bit constant-current sink LED drivers from Analog Devices. This driver has a 4-wire serial interface using four inputs and a data output. The output-enable input (BLK) gates to all 24 outputs ON and OFF and is fast enough to be used as a PWM input for LED intensity control. The constant-current outputs are programmed together

to around 12mA using a single external resistor. 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.

UT-S 7-SEG B 2 Click hardware overview image

Features overview

Development board

Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand

functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,

which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.

Curiosity PIC32MZ EF double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC32

MCU Memory (KB)

2048

Silicon Vendor

Microchip

Pin count

100

RAM (Bytes)

524288

Used MCU Pins

mikroBUS™ mapper

TLC5947 Data Latch
RPB4
AN
ID SEL
RA9
RST
TLC5947 Data Latch / ID COMM
RPD4
CS
SPI Clock
RPD1
SCK
SPI Data OUT
RPD14
MISO
SPI Data IN
RPD3
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Output Enable
RPE8
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

UT-S 7-SEG B 2 Click Schematic schematic

Step by step

Project assembly

Curiosity PIC32MZ EF front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity PIC32 MZ EF as your development board.

Curiosity PIC32MZ EF front image hardware assembly
GNSS2 Click front image hardware assembly
Prog-cut hardware assembly
Board mapper by product7 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Curiosity PIC32 MZ EF MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Software Support

Library Description

This library contains API for UT-S 7-SEG B 2 Click driver.

Key functions:

  • uts7segb2_display_number - This function displays the desired number and brightness on the selected segments

  • uts7segb2_display_character - This function displays the desired characters and brightness on the selected segments

  • uts7segb2_set_led_output - This function sets the LED driver output

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 main.c
 * @brief UT-S 7-SEG B 2 Click example
 *
 * # Description
 * This example demonstrates the use of the UT-S 7-SEG B 2 Click board
 * by writing and displaying the desired numbers on the screen.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of SPI module and log UART.
 * After driver initialization, the app executes a default configuration.
 *
 * ## Application Task
 * The demo application draws numbers, in hexadecimal format, 
 * from 0h to FFFh on the top segment group and from FFFh to 0h on the bottom segment group.
 * Results are being sent to the UART Terminal, where you can track their changes.
 *
 * @author Mikroe Team
 *
 */

#include "board.h"
#include "log.h"
#include "uts7segb2.h"

static uts7segb2_t uts7segb2;
static log_t logger;
static uts7segb2_number_cfg_t number;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    uts7segb2_cfg_t uts7segb2_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.
    uts7segb2_cfg_setup( &uts7segb2_cfg );
    UTS7SEGB2_MAP_MIKROBUS( uts7segb2_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == uts7segb2_init( &uts7segb2, &uts7segb2_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( UTS7SEGB2_ERROR == uts7segb2_default_cfg ( &uts7segb2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    number.brightness_top = UTS7SEGB2_BRIGHTNESS_DEFAULT;
    number.brightness_bottom = UTS7SEGB2_BRIGHTNESS_DEFAULT;
    number.base = UTS7SEGB2_BASE_NUM_SYS_HEXADECIMAL;
    number.dot_bit_mask = UTS7SEGB2_TOP_SEG_NO_DOT | UTS7SEGB2_BOTTOM_SEG_NO_DOT;
    log_info( &logger, " Application Task " );
    Delay_ms ( 100 );
}

void application_task ( void )
{
    for ( uint16_t num_cnt = 0; num_cnt <= UTS7SEGB2_HEXADECIMAL_NUM_MAX; num_cnt++ )
    {
        number.num_top = num_cnt;
        number.num_bottom = UTS7SEGB2_HEXADECIMAL_NUM_MAX - num_cnt;
        if ( UTS7SEGB2_OK == uts7segb2_display_number( &uts7segb2, number ) )
        {
            log_printf( &logger, " %.3X\r\n", number.num_top );
            log_printf( &logger, " %.3X\r\n\n", number.num_bottom );
            Delay_ms ( 100 );
        }
    }
    log_printf( &logger, " --------------\r\n\n" );
    Delay_ms ( 1000 );
}

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

Additional Support

Resources

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