Modul 3-1

MODULE 3: SEVEN SEGMENT DISPLAYS

• Introduction to the basics of seven-segment displays.

• Focus on using an Arduino for displaying numbers on a TM1637 seven-segment display.

OBJECTIVE

Seven Segment Displays

• Introduce basic principles of seven-segment displays.

COMPONENTS USED

• Arduino Uno

• Arduino Shield

• TM1637 Seven Segment Display

• Button

• Buzzer

INTRODUCTION TO SEVEN SEGMENT DISPLAYS

• Common Anode Display: All positive ends (anodes) connected to one pin; negative ends (cathodes) connected to ground.

• Common Cathode Display: Negative ends (cathodes) of lights connected to one pin; positive ends (anodes) powered to light segments.

• Structure: Seven individual LEDs arranged to resemble the digit '8'.

• Common applications: calculators, clocks, elevators due to cost-effectiveness and usability.

DISPLAYING NUMBERS AND LETTERS

• Logic for segment activation:

  • In a Common Cathode (CC) display, a segment turns on with a LOW (0) signal.

  • In a Common Anode (CA) display, a segment turns on with a HIGH (1) signal.

• Capabilities: Can display numbers 0-9 and some letters A-Z through appropriate segment lighting.

EXAMPLE: DISPLAY ON SEVEN SEGMENT DISPLAYS

• Using TM1637 display driver to control the seven-segment display.

• Ensure connection of the display to the Arduino as per the schematic.

CODE EXAMPLE 1: DISPLAY ON SEVEN SEGMENT DISPLAYS

#include <TM1637Display.h>
#define CLK 3
#define DIO 2
int num = 0;
TM1637Display display(CLK, DIO);

void setup() {
    display.setBrightness(5);
}

void loop() {
    for(num=0;num<=9;num++) {
        display.showNumberDec(num,true);
        delay(500);
    }
    if(num>9) {
        display.clear();
        uint8_t data[] = { SEG_G, /* Display sequence data */ };
        for(int i=0; i<5; i++) {
            display.setSegments(data);
            delay(400);
            display.clear();
            delay(250);
        }
        num == 10;
    }
    for(num=10;num>=0;num--) {
        display.showNumberDec(num,true);
        delay(500);
    }
}

PRACTICAL EXERCISE

• Create a countdown system utilizing the seven-segment displays that counts until it reaches 9.

• Display “FULL” when attempting to exceed this count.

CODE EXAMPLE: COUNTING ON SEVEN SEGMENT DISPLAYS

#include <TM1637Display.h>
#define CLK 8
#define DIO 7
#define SW1 3
#define SW2 2
#define BUZZER 5
int num = 0;
bool sw1Pressed = false;
bool sw2Pressed = false;
TM1637Display display(CLK, DIO);

void setup() {
    pinMode(SW1, INPUT_PULLUP);
    pinMode(SW2, INPUT_PULLUP);
    pinMode(BUZZER, OUTPUT);
    display.setBrightness(5);
    Serial.begin(9600);
}

void loop() {
    bool sw1State = digitalRead(SW1) == LOW;
    bool sw2State = digitalRead(SW2) == LOW;
    if (sw1State && !sw1Pressed) {
        sw1Pressed = true;
        num++;
        if (num > 9) {
            displayFullMessage();
        } else {
            display.showNumberDec(num, true);
            Serial.println(num);
        }
    } else if (!sw1State) {
        sw1Pressed = false;
    }

    if (sw2State && !sw2Pressed) {
        sw2Pressed = true;
        num--;
        if (num < 0) {
            num = 0;
        }
        display.showNumberDec(num, true);
        Serial.println(num);
    } else if (!sw2State) {
        sw2Pressed = false;
    }
}

// Function to display "FULL" message
void displayFullMessage() {
    num = 9;
    display.clear();
    uint8_t data[] = { /* Display sequence for FULL message */ };
    for (int i = 0; i < (sizeof(data) - 3); i++) {
        display.setSegments(data + i);
        delay(500);
    }
...
}

CONCLUSION

• The module teaches the use of seven-segment displays integrated with Arduino programming.

• Students complete a hands-on project: a simple counter limited to 9.

• Encourages project customization and fosters learning in electronics and programming.

THANK YOU!