មេរៀនទី១៩៖​ 7 Segment one Digit Cathode Type Using Matrix Code

7 Segment one Digit Cathode Type

 

1. Objective

The objective is talk about, Use matrix code (Array) to display 7 segment one digit cathode type.

2. Requirement

• Arduino Uno x1
• USB Cable x1 (No need in simulation)
• Breadboard x1 (No need in simulation)
• 7 Segment one digit x1 (Anode Type)
  
• Resistor 220Ohm x1
  
• 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

 

*Note you must find pin A to G in real 7 segment because the pin are not order as simulation. 

 

Figure 1. Arduino Connection

4. Coding

// by Tann Thona

// 7 Segment Cathode Type

int pinA = 13;
int pinB = 12;
int pinC = 11;
int pinD = 10;
int pinE = 9;
int pinF = 8;
int pinG = 7;
int j = 0;
int i = 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);
}

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

  for (j = 0; j<7; j++)
  {
    digitalWrite(Arduino_Pins[j], Segment_Pins[i][j]);
  }
  delay(100);

  i++;
  if(i>10)
  {
    i = 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 9 in loop.

Watch Video Explain in Khmer

YouTube: ICT4D-KH

Copyright By Tann Thona