7 Segment 4 Digits Display Count Up Number

7 Segment 4 Digits Display

1. Objective

The objective of this project is talk about, how to use 7 segment 4 digits and display count up from 0 to 9999.

2. Electronic Requirement

• Arduino UNO
• USP Cable
• 7 Segment 4 digits (Cathode Type) 
• Breadboard
• Electronic Wire
• Resistor x4 (330Ohm or 220Ohm)
• Arduino pin 5 --> R1 --> 7 Segment D1
• Arduino pin 4 --> R2 --> 7 Segment D2
• Arduino pin 3 --> R3 --> 7 Segment D3
• Arduino pin 2 --> R4 --> 7 Segment D4

3. How to Build it?

 The first build circuit like below on Fig 1.1 automatic count up number.

Fig 1. 7 segment 4 digits display automatic count up number 0 to 9999

// Write code by Tann Thona (25/02/2017), Adviser: Chann Tola

int PIN_A = 12;
int PIN_B = 11;
int PIN_C = 10;
int PIN_D = 9;
int PIN_E = 8;
int PIN_F = 7;
int PIN_G = 6;
int DL4 = 5;
int DL3 = 4;
int DL2 = 3;
int DL1 = 2;
int i = 0;
int j = 0;
int n = 0;
int k = 0;
int h = 0;
int Arduino_Pins[7] = {PIN_A, PIN_B, PIN_C, PIN_D, PIN_E, PIN_F, PIN_G};   // 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
                           };
int DELAY = 1;
int TIME = 0;
void digit4()
{
    digitalWrite(DL1,0);
    digitalWrite(DL2,1);
    digitalWrite(DL3,1);
    digitalWrite(DL4,1);
    for(j=0;j<7;j++)  {      
      digitalWrite(Arduino_Pins[j],Segment_Pins[i][j]);      
    }
    delay(DELAY);    
}
//=============================
void digit3()
{
    digitalWrite(DL1,1); // change 1 to 0 and 0 to 1 (for 7segment anoth type)
    digitalWrite(DL2,0);
    digitalWrite(DL3,1);
    digitalWrite(DL4,1);
    for(j=0;j<7;j++)  
    {      
      digitalWrite(Arduino_Pins[j],Segment_Pins[n][j]);      
    } // end loop j   
    delay(DELAY);
}
//==============================
void digit2()
{
    digitalWrite(DL1,1);
    digitalWrite(DL2,1);
    digitalWrite(DL3,0);
    digitalWrite(DL4,1);
        for(j=0;j<7;j++)
        {          
          digitalWrite(Arduino_Pins[j],Segment_Pins[k][j]);          
        } // end loop k
        delay(DELAY);
}
//==============================
void digit1()
{
    digitalWrite(DL1,1);
    digitalWrite(DL2,1);
    digitalWrite(DL3,1);
    digitalWrite(DL4,0);
        for(j=0;j<7;j++)
        {          
          digitalWrite(Arduino_Pins[j],Segment_Pins[h][j]);          
        } // end loop j
        delay(DELAY);
}
void setup()
{
  // put your setup code here, to run once:
  pinMode(PIN_A, OUTPUT);
  pinMode(PIN_B, OUTPUT);
  pinMode(PIN_C, OUTPUT);
  pinMode(PIN_D, OUTPUT);
  pinMode(PIN_E, OUTPUT);
  pinMode(PIN_F, OUTPUT);
  pinMode(PIN_G, OUTPUT);
  pinMode(DL1, OUTPUT);
  pinMode(DL2, OUTPUT);
  pinMode(DL3, OUTPUT);
  pinMode(DL4, OUTPUT);

}
void loop()
{
  
  for(i=0;i<10;i++) 
  {
    for(TIME=0;TIME<=250;TIME++)// Simulation (TIME=0;TIME<=250;TIME++)
    {
    digit4();   
    digit3();
    digit2();
    digit1();
    //delay(1);
    }    
    // Condition Count Up
        
            if(i==9) 
            {
              n++;
              //----------------
               if(n>9)
               {
                 k++;
                 //----------------
                  if(k>9)
                   {
                     h++;
                     //----------------
                      if(h>9)
                       {
                         h = 0;
                       } // end if(h>9)
                   } // end if(k==9)
                    //----------------
                     if(k>9)
                      {
                       k = 0;
                      }
               } // end if(n==9)
               //----------------
              if(n>9) 
              {
                n = 0;
              } // end if (n>9)
            } // end if (i==9)          
         
    } // end time
    
 } // End Void Loop
 

4. Result

Now we get a result that 7 segment 4 digits  display are started from 0 to 9999 with count up one by one per second in automatically like video below.

Royal University of Phnom Penh
Faculty of Engineering
Dep. Telecommunication and Electronic Engineering

Group Member:
1. Tann Thona
2. Thach Soveasna
3. Chhoy Noreath
4. Neth Channa
5. Mok Vira 


Instructor: Prof. Chann Tola
Date: 25 February 2017