Interfacing a 7-Segment Display Circuit with Arduino UNO

Interfacing a 7-Segment Display Circuit with Arduino UNO is small electric part which shows numbers.

It have 7 LEDs inside and makes shapes for numbers and some letters.

We can connect it to Arduino and then it tells what number to show.

This article teaches how to connect 7-segment to Arduino UNO and show numbers.

It is cheap way to show numbers where we can see it on counters or shop signs.

To show letters or symbols we need costly LCD screen.

So people use 7-segment only for simple number display.

Coding with Explanation:

#define a 2
#define b 3
#define c 4
#define d 5
#define e 6
#define f 7
#define g 8

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() {
  displayNumber(0);
  delay(1000);
  displayNumber(1);
  delay(1000);
  // ... other numbers
}

void displayNumber(int num) {
  // Code to set pins based on the desired number
}

Code Explanation:

• Pin definitions say which pin goes to which part of display.
• Setup make those pins work as output.
• Loop keep running and show numbers again and again.
• Display number take number and turn ON right pins to show it on display.

Circuit Working:

Parts List:

In this article the code goes through many numbers and use display number for each.

Inside display number it control which parts of display turns ON.

Different number need different part ON or OFF.

If we want to show 0 to 9 on 7-segment display:

• Code tell Arduino
• Go from number 0 to 9.
• For each number it uses display number function.
• Inside that it decide which lights (segments) must be ON or OFF.
• Turn ON the right lights to show that number.

How to Build:

To build a Interfacing a 7-Segment Display Circuit with Arduino UNO we need to follow the below mentioned steps for connections:

• Connect common cathode of 7-segment display to ground.
• Connect segments a, b, c, d, e, f, g to Arduino pins using 470 ohm resistors.
• Use 7809 IC to give stable 9V DC power to Arduino.

Conclusion:

This project for Interfacing a 7-Segment Display Circuit with Arduino UNO is good for beginners and it helps to learn how to use Arduino with 7-segment display.

It give strong base to understand digital electronics and microcontroller coding.

Later we can make things like counters, displays and digital clocks.

References:

How to connect common anode 7 segment display to arduino uno