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Four digit tube display
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
961B
Binary