មេរៀនទី២០៖ 7 Segment Two Digits Cathode Type

7 Segment Two Digits Cathode Type

 

1. Objective

The objective is talk about, Use 7 segment 2 digits cathode type display count up number.

2. Requirement

• Arduino Uno x1
• USB Cable x1 (No need in simulation)
• Breadboard x1 (No need in simulation)
• 7 Segment 2 digits x1 (Cathode Type)
  
• Resistor 220Ohm x2
  
• Electronic Wire (No need in simulation) 

 

3. Build Circuit

Build circuit like Figure 1. 

 

Segment Pin A to Arduino pin 13 

Segment Pin B to Arduino pin 12

Segment Pin C to Arduino pin 11 

Segment Pin D to Arduino pin 10

Segment Pin E to Arduino pin 9

Segment Pin F to Arduino pin 8

Segment Pin G to Arduino pin 7 

Segment Pin D1 to Arduino pin 6 

Segment Pin D2 to Arduino pin 5

 

*Note you must find pin A, B, C, D, E, F, G, D1 and D2 in real 7 segment because the pin are not order as simulation. 

 

Figure 1. Arduino Connection

 

4. Coding

// by Tann Thona

// 7 Segment 2 digits cathode

int pinA = 13;
int pinB = 12;
int pinC = 11;
int pinD = 10;
int pinE = 9;
int pinF = 8;
int pinG = 7;
int D2 = 6;
int D1 = 5;
int j = 0;
int i = 0;
int k = 0;

int Arduino_Pins[7] = {pinA, pinB, pinC, pinD, pinE, pinF, pinG};   // an array of pin numbers to which LEDs
int Segment_Pins[10][7] = {{1, 1, 1, 1, 1, 1, 0}, // 0
  {0, 1, 1, 0, 0, 0, 0}, // 1
  {1, 1, 0, 1, 1, 0, 1}, // 2
  {1, 1, 1, 1, 0, 0, 1}, // 3
  {0, 1, 1, 0, 0, 1, 1}, // 4
  {1, 0, 1, 1, 0, 1, 1}, // 5
  {1, 0, 1, 1, 1, 1, 1}, // 6
  {1, 1, 1, 0, 0, 0, 0}, // 7
  {1, 1, 1, 1, 1, 1, 1}, // 8
  {1, 1, 1, 1, 0, 1, 1}, // 9
};

void setup() {
  // put your setup code here, to run once:
  pinMode(pinA, OUTPUT);
  pinMode(pinB, OUTPUT);
  pinMode(pinC, OUTPUT);
  pinMode(pinD, OUTPUT);
  pinMode(pinE, OUTPUT);
  pinMode(pinF, OUTPUT);
  pinMode(pinG, OUTPUT);
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  for (int t = 0; t < 20; t++) // int t = 0; t < 500; t++
  {
    digitalWrite(D1, 0);
    digitalWrite(D2, 1);
    for (j = 0; j < 7; j++)
    {
      digitalWrite(Arduino_Pins[j], Segment_Pins[i][j]);
    }
    delay(100); // delay(1);

    digitalWrite(D1, 1);
    digitalWrite(D2, 0);
    for (j = 0; j < 7; j++)
    {
      digitalWrite(Arduino_Pins[j], Segment_Pins[k][j]);
    }
    delay(100); // delay(1);


    i++;
    if (i == 9)
    {
      i = 0;
      k++;
      if (k == 9)
      {
        k = 0;
      }

    }
  }
}

Click here to download code and simulation file

 

4. Result

According to code above,7 segment is display with count up number from 0 to 99 in loop.

Watch Video Explain in Khmer

YouTube: ICT4D-KH

Copyright By Tann Thona