Four digit tube display

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In this lesson, you will learn how to use a 4-digit 7-segment display.

Overview
When using 1-digit 7-segment display, please notice that if it is common anode, the common anode pin connects to the power source; if it is common cathode, the common cathode pin connects to the GND.
When using 4-digit 7-segment display, the common anode or common cathode pin is used to control which digit is displayed. Even though there is only one digit working, the principle of Persistence of Vision enables you to see all numbers displayed because each the scanning speed is so fast that you hardly notice the intervals.
Component Required:
1 x Arduino Uno R3
1 x 830 tie-points breadboard
1 x 74HC595 IC
1 x 4 Digit 7-Segment Display
4 x 220 ohm resistors
23 x M-M wires (Male to Male jumper wires)
Component Introduction
Four Digital Seven segment display
Connection Diagram:
Wiring schematic:
Physical wiring diagram:
Code:
int latch = 9; //74HC595  pin 9 STCP
int clock = 10; //74HC595  pin 10 SHCP
int data = 8; //74HC595  pin 8 DS
​
unsigned char table[] =
{ 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c
  , 0x39, 0x5e, 0x79, 0x71, 0x00
};
​
void setup() {
  pinMode(latch, OUTPUT);
  pinMode(clock, OUTPUT);
  pinMode(data, OUTPUT);
}
void Display(unsigned char num)
{
​
  digitalWrite(latch, LOW);
  shiftOut(data, clock, MSBFIRST, table[num]);
  digitalWrite(latch, HIGH);
​
}
void loop() {
  Display(1);
  delay(500);
  Display(2);
  delay(500);
  Display(3);
  delay(500);
  Display(4);
  delay(500);
  Display(5);
  delay(500);
  Display(6);
  delay(500);
  Display(7);
  delay(500);
  Display(8);
  delay(500);
  Display(9);
  delay(500);
  Display(10);
  delay(500);
  Display(11);
  delay(500);
  Display(12);
  delay(500);
  Display(13);
  delay(500);
  Display(14);
  delay(500);
  Display(15);
  delay(500);
}
four-digit-display.ino
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Last modified 6mo ago

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Outline

Overview

Component Required:

Component Introduction

Connection Diagram:

Wiring schematic:

Physical wiring diagram:

Code: