## 4 Digital 7segment Display ## This article is the use of Arduino MEGA 2560 board to drive some of the color LED digital tube.All of the content is edit in the edit in the easyeda.com Usually in the production , the 4-digital 7 segment LED display is a lot of advantages, in the network, we can see many users in the difficult search related projects. Here we come to design a Arduino 7 digital four-segment LED display program. The 4 digital led is a collection in one package, the peripheral pin is very few, the connection is simple. The circuit schematic diagram based on the easyeda.com website design, easyeda can find the design of the source file, you can change after you as your own design. **program code**

int a = 37;
int b = 36;
int c = 35;
int d = 34;
int e = 33;
int f = 32;
int g = 31;
int p = 30;
int d4 = 38;
int d3 = 39;
int d2 = 40;
int d1 = 41;
long n = 0;
int m = 100;
int delay = 100;  
  
byte segs[7] = { a, b, c, d, e, f, g };
 
byte seven_seg_digits[10][7] = { { 0,0,0,0,0,0,1 },  // = 0
                                 { 1,0,0,1,1,1,1 },  // = 1
                                 { 0,0,1,0,0,1,0 },  // = 2
                                 { 0,0,0,0,1,1,0 },  // = 3
                                 { 1,0,0,1,1,0,0 },  // = 4
                                 { 0,1,0,0,1,0,0 },  // = 5
                                 { 0,1,0,0,0,0,0 },  // = 6
                                 { 0,0,0,1,1,1,1 },  // = 7
                                 { 0,0,0,0,0,0,0 },  // = 8
                                 { 0,0,0,0,1,0,0 }   // = 9
                             }; 
 
void setup()
{
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
  pinMode(d3, OUTPUT);
  pinMode(d4, OUTPUT);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(p, OUTPUT);
}
 
void loop()
{
  clearLEDs();
  pickDigit(1);
  lightSegments((n/m/1000)%10);
  delayMicroseconds(delay);
 
  clearLEDs();
  pickDigit(2);
  lightSegments((n/x/100)%10);
  delayMicroseconds(del);
 
  clearLEDs();
  pickDigit(3);
  dispDec(3);
  lightSegments((n/x/10)%10);
  delayMicroseconds(delay);
 
  clearLEDs();
  pickDigit(4);
  lightSegments(n/x%10);
  delayMicroseconds(delay);
 
  n++;
 
}
 
void pickDigit(int x)  
{
  digitalWrite(d1, LOW);
  digitalWrite(d2, LOW);
  digitalWrite(d3, LOW);
  digitalWrite(d4, LOW);
 
  switch(m)
  {
  case 1: 
    digitalWrite(d1, HIGH); 
    break;
  case 2: 
    digitalWrite(d2, HIGH); 
    break;
  case 3: 
    digitalWrite(d3, HIGH); 
    break;
  default: 
    digitalWrite(d4, HIGH); 
    break;
  }
}
 
void dispDec(int m) 
{
  digitalWrite(p, LOW);
}
 
void clearLEDs()  
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(p, HIGH);
}
void lightSegments(int x) {
  for (int i = 0; i 

**The Final vedio**