How to Connect 4 Digit 7 Segment LED Display With Arduino

// Hello friends welcome to Techno-E-Solution
// Here is the Code for Interface 4 Digit 7 Segment Display
#define Dig1 6
#define Dig2 9
#define Dig3 10
#define Dig4 11
#define DIGIT_ON LOW
#define DIGIT_OFF HIGH
#define DISPLAY_BRIGHTNESS 5000
boolean duiz = false;
boolean hon = false;
#define segA 2
#define segB 3
#define segC 4
#define segD 5
#define segE A0
#define segF 7
#define segG 8
//int segPD = ;
void setup()
{
 pinMode(segA, OUTPUT);
 pinMode(segB, OUTPUT);
 pinMode(segC, OUTPUT);
 pinMode(segD, OUTPUT);
 pinMode(segE, OUTPUT);
 pinMode(segF, OUTPUT);
 pinMode(segG, OUTPUT);
pinMode(Dig1, OUTPUT);
pinMode(Dig2, OUTPUT);
pinMode(Dig3, OUTPUT);
pinMode(Dig4, OUTPUT);
Serial.begin(9600);
}
void loop()
{
 int number;
 Serial.println(number);

 for( int i = 0; i<=9999; i++){// for loop to pick a number from.
 duiz = false;
 hon = false;
 for(int k = 0; k<50; k++){ // for loop to slow it down.

 int figur = i;
 for(int digit = 1 ; digit < 5 ; digit++) { //for loop to place the number in the right digit
 switch(digit) {
 case 1:
 if(figur > 999){
 digitalWrite(Dig1, DIGIT_ON);
 lightNumber(figur / 1000); // for example 2511 / 1000 = 2
 figur %= 1000; // new value of figur = 511 figur = figur %1000

 delayMicroseconds(DISPLAY_BRIGHTNESS);
 if (figur < 100){
 duiz = true;
 if (figur <10){
 hon = true;

 }

 }else duiz = false;
 }

 break;
 case 2:
 if(duiz == true){
 digitalWrite(Dig2, DIGIT_ON);
 lightNumber(0);
 delayMicroseconds(DISPLAY_BRIGHTNESS);

 }if(hon == true){
 break;
 }

 if(figur > 99 && figur < 1000){
 digitalWrite(Dig2, DIGIT_ON);
 lightNumber(figur / 100);
 figur %= 100;
 delayMicroseconds(DISPLAY_BRIGHTNESS);
 if (figur < 10){
 hon = true;

 }else hon = false;
 }
 break;
 case 3:
 if(hon == true){
 digitalWrite(Dig3, DIGIT_ON);
 lightNumber(0);
 delayMicroseconds(DISPLAY_BRIGHTNESS);
 break;
 }

 if(figur > 9 && figur < 100){
 digitalWrite(Dig3, DIGIT_ON);
 lightNumber(figur / 10);
 figur %= 10;
 delayMicroseconds(DISPLAY_BRIGHTNESS);
 }

 break;
 case 4:
 if(figur < 10){
 digitalWrite(Dig4, DIGIT_ON);
 lightNumber(figur);
 delayMicroseconds(DISPLAY_BRIGHTNESS);

 break;
 }
 }
 //Turn off all segments
 lightNumber(10);
 //Turn off all digits
 digitalWrite(Dig1, DIGIT_OFF);
 digitalWrite(Dig2, DIGIT_OFF);
 digitalWrite(Dig3, DIGIT_OFF);
 digitalWrite(Dig4, DIGIT_OFF);

}
}}}
void lightNumber(int numberToDisplay) {
#define SEGMENT_ON HIGH
#define SEGMENT_OFF LOW
 switch (numberToDisplay){
 case 0:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_ON);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_OFF);
 break;
 case 1:
 digitalWrite(segA, SEGMENT_OFF);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_OFF);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_OFF);
 digitalWrite(segG, SEGMENT_OFF);
 break;
 case 2:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_OFF);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_ON);
 digitalWrite(segF, SEGMENT_OFF);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 3:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_OFF);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 4:
 digitalWrite(segA, SEGMENT_OFF);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_OFF);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 5:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_OFF);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 6:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_OFF);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_ON);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 7:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_OFF);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_OFF);
 digitalWrite(segG, SEGMENT_OFF);
 break;
 case 8:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_ON);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 9:
 digitalWrite(segA, SEGMENT_ON);
 digitalWrite(segB, SEGMENT_ON);
 digitalWrite(segC, SEGMENT_ON);
 digitalWrite(segD, SEGMENT_ON);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_ON);
 digitalWrite(segG, SEGMENT_ON);
 break;
 case 10:
 digitalWrite(segA, SEGMENT_OFF);
 digitalWrite(segB, SEGMENT_OFF);
 digitalWrite(segC, SEGMENT_OFF);
 digitalWrite(segD, SEGMENT_OFF);
 digitalWrite(segE, SEGMENT_OFF);
 digitalWrite(segF, SEGMENT_OFF);
 digitalWrite(segG, SEGMENT_OFF);
 break;
 }
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