Simplify the way you present information with SC10-21SRWA and ATmega1284

Count in style!

Published Sep 07, 2023

Click board™

BIG 7-SEG R Click

Dev. board

EasyAVR v7

Compiler

NECTO Studio

MCU

ATmega1284

Our seven-segment LED display is designed to illuminate information with clarity and precision, making it the ideal choice for all your numeric readout needs

Hardware Overview

How does it work?

BIG 7-Seg R Click is based on the SC10-21SRWA, a single-digit numeric display from Kingbright. This super bright red source color device is made with a Gallium Aluminium Arsenide red light-emitting diode. It features low current operation, high light output, excellent character appearance, and is mechanically rugged. The display works on 5V and has a common cathode as its internal design. It consists of seven red 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 Big 7-Seg R Click is established via a 4-Wire SPI serial interface and the 8-bit

serial-IN, parallel-OUT 74HC595, a shifter register with 3-state output registers from Texas Instruments. The shift register provides a separate clock for both the shift and the storage register. In addition, you can set all shift register values to zero by applying logic LOW state on pin MR, and this function is independent of all clocks. One of the main features of the Big 7-Seg R Click is light intensity management. The light intensity can be set over the PWM pin. The SC10-21SRWA display is a 5V-only device. To work with 3.3V logic MCUs, this Click board™ features five SN74LVC1T45s, single-bit dual-supply bus transceivers with

configurable voltage translation, and 3-state outputs from Texas Instruments. These noninverting transceivers use two separate configurable power-supply rails and are designed for asynchronous communication between the two data buses. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the DATA 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

EasyAVR v7 is the seventh generation of AVR development boards specially designed for the needs of rapid development of embedded applications. It supports a wide range of 16-bit AVR microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyAVR v7 allows you to connect accessory boards, sensors, and custom electronics more

efficiently than ever. Each part of the EasyAVR v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use a wide range of external power sources, including an external 12V power supply, 7-12V AC or 9-15V DC via DC connector/screw terminals, and a power source via the USB Type-B (USB-B)

connector. Communication options such as USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets which cover a wide range of 16-bit AVR MCUs. EasyAVR v7 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

Architecture

AVR

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

16384

Used MCU Pins

mikroBUS™ mapper

Master Reset

PA6

RST

Data Latch

PA5

SPI Clock

PB7

SCK

SPI Data OUT

PB6

MISO

SPI Data IN

PB5

MOSI

Power Supply

3.3V

Ground

GND

Light Intensity Control

PD4

PWM

INT

SCL

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

EasyAVR v7 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyAVR v7 as your development board.

NECTO Output Selection Step Image hardware assembly

In the advanced settings, pay special attention to the Redirect standard output field. By default, it is set to Application output as the method of displaying final results. To show results via a UART terminal, select the “UART” option in that field and click the “SAVE” button. You will be returned to the Compiler field, and now you can move on to the next step by pressing the “NEXT” button.

GNSS2 Click front image hardware assembly

EasyAVR v7 Access DIP MB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

Necto DIP image step 7 hardware assembly

EasyPIC PRO v7a Display Selection Necto Step hardware assembly

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 BIG 7-SEG R Click driver.

Key functions:

big7seg_display_off - Turn OFF BIG 7-SEG display
big7seg_write_data_number - Function write number
big7seg_write_data_character - Function write character

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 Big7Seg Click example
 * 
 * # Description
 * This application sets seven-segment leds on the display.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Driver initializaion and turning on the display
 * by setting PWM pin to logic 1 and prepare to communcation via SPI.
 * 
 * ## Application Task  
 * This example shows functionality of the BIG 7-SEG R click,
 * shows number or character on display.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "big7seg.h"

// ------------------------------------------------------------------ VARIABLES

static big7seg_t big7seg;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    big7seg_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.

    big7seg_cfg_setup( &cfg );
    BIG7SEG_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    big7seg_init( &big7seg, &cfg );

    big7seg_set7seg( &big7seg );
    Delay_100ms( );
}

void application_task ( )
{
    uint8_t counter;

    big7seg_reset7seg( &big7seg );
    big7seg_display_on( &big7seg );
    Delay_1sec( );

    big7seg_write_data( &big7seg, 0x40 );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'B' );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'I' );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'G' );
    Delay_1sec( );
    big7seg_write_data( &big7seg, 0x08 );
    Delay_1sec( );
    big7seg_write_data_number( &big7seg, 7 );
    Delay_1sec( );
    big7seg_write_data( &big7seg, 0x40 );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'S' );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'E' );
    Delay_1sec( );
    big7seg_write_data_character( &big7seg, 'G' );
    Delay_1sec( );
    
    big7seg_write_data( &big7seg, 0x00 );
    Delay_1sec( );
    for ( counter = 65; counter < 91; counter ++ )
    {
        big7seg_write_data_character(  &big7seg, counter );
        Delay_1sec( );
    }

    big7seg_display_off( &big7seg );
    Delay_1sec( );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END