7-Segment display to Arduino in tinker cad

Arduino UNO 7-Segment Display Interfacing in Tinkercad (Beginner Guide)

Introduction

In this beginner-friendly project, we will learn how to interface a Common Cathode 7-Segment Display with Arduino Uno using Tinkercad simulation.

This project helps students understand:

Digital output control
LED segment logic
Number display using Arduino
Basic embedded programming

This is a perfect school project for beginners.

Components Required

Arduino UNO
Common Cathode 7-Segment Display
220Ω Resistors (7)
Breadboard
Jumper wires

Circuit Connections

Place the 7-segment display on the breadboard.
Connect segments (a–g) to Arduino digital pins through 220Ω resistors.
Connect both common cathode (COM) pins to GND.
Ensure all connections are correct to avoid LED damage.

Arduino Code


int a = 7;
int b = 8;
int c = 9;
int d = 10;
int e = 11;
int f = 12;
int g = 13;

void setup() {
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
}

void loop() {

  // Display 0
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
  delay(1000);

}

How It Works

A 7-segment display consists of 7 LEDs arranged in the shape of number 8.

When a segment pin is HIGH, that LED glows.
By turning ON specific segments, we can display numbers 0–9.
Since this is a Common Cathode display, we connect COM to GND.

Applications

Digital counters
Visitor counter
Digital clock
Scoreboard system
School Arduino projects

FAQs

Why use 220Ω resistors?

To prevent excess current and protect LEDs from burning.

What is Common Cathode?

All negative terminals of LEDs are connected together and connected to GND.

Components Required :

Arduino UNO
Common Cathode 7-Segment Display (standard in Tinkercad)
220Ω resistors (x7)
Breadboard
Jumper wires

Circuit Setup:

Place the 7-segment display on the breadboard.
Connect each segment pin (a–g) to Arduino digital pins through 220Ω resistors.
Connect both common cathode pins (COM) to GND on Arduino.
Make sure you connect resistors to prevent LEDs from burning out.

Below is the code to display the numbers on the 7 segment display.

Number 0: Number 1:

For number 0 to be displayed in the 7 segment display pins 11,10,7,8,9,12 should be high and pin 13 should be low.
For number 1 to be displayed in the 7 segment display pins 11,8,9,12 should be low and pin 10,7 should be high.

Number 2: Number 3:

For number 2 to be displayed in the 7 segment display pins 13,11,10,8,9, should be high and pin 7,12 should be low.
For number 3 to be displayed in the 7 segment display pins 11,10,7,8,13 should be low and pin 9,12 should be low.

Number 4: Number 5:

For number 4 to be displayed in the 7 segment display pins 7,10,12,13 should be high and pin 8,9,11 should be low.
For number 5 to be displayed in the 7 segment display pins 7,8,11,12,13 should be low and pin 10,9 should be high.

Try it in tinker cad :

ROBOTICS

Search This Blog