/* 
 *  Tutorial By IOTkece
 */

#define OFF LOW
#define ON HIGH

unsigned int count;

int pinA = 12;
int pinB = 10;
int pinC = 8;
int pinD = 7;
int pinE = 6;
int pinF = 11;
int pinG = 9;

int dig1 = 5;
int dig2 = 2;
int dig3 = 3;
int dig4 = 4;

 /* 
    A
   ---
F |   | B
  | G |
   ---
E |   | C
  |   |
   ---  . dec
    D
    
*/
          
void setup() {
  for(char i=2; i<13; i++){
    pinMode(i,OUTPUT);
  }
 
  pinMode(A0,INPUT);
  pinMode(A1,INPUT);
  pinMode(A2,INPUT);
  digitalWrite(A0,1);
  digitalWrite(A1,1);
  digitalWrite(A2,1);
}

void loop() {  
  char seg1 = int(count)/1000;
  char seg2 = (int(count)%1000)/100;
  char seg3 = (int(count)%100)/10;
  char seg4 = (int(count)%100)%10; 

  if (count < 10){
    seg1=10;
    seg2=10;
    seg3=10;
  }
  else if (count < 100){
    seg1=10;
    seg2=10;
  }
  else if (count < 1000){
    seg1=10;
  }
 
  digitalWrite(dig4,OFF);
  digitalWrite(dig1,ON);
  displaySeg(seg1);
  delay(5);
 
  digitalWrite(dig1,OFF);
  digitalWrite(dig2,ON);
  displaySeg(seg2);
  delay(5);
 
  digitalWrite(dig2,OFF);
  digitalWrite(dig3,ON);
  displaySeg(seg3);
  delay(5);
 
  digitalWrite(dig3,OFF);
  digitalWrite(dig4,ON);
  displaySeg(seg4);
  delay(5);

 
  if (digitalRead(A0)==0 && count < 9999){
    count++;
    delay(200);
  }
  else if(digitalRead(A1)==0 && count != 0){
    count--;
    delay(200);
  }
  else if(digitalRead(A2)==0){
    count=0;
  }
}

void displaySeg(char segment){
 switch (segment){
   case 0: nol(); break;
    case 1: satu(); break;
    case 2: dua(); break;
    case 3: tiga(); break;
    case 4: empat(); break;
    case 5: lima(); break;
    case 6: enam(); break;
    case 7: tujuh(); break;
    case 8: delapan(); break;
    case 9: sembilan(); break;
   case 10: sepuluh(); break;
 }
}
void nol(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, OFF);
digitalWrite(pinF, OFF);
digitalWrite(pinG, ON);
}

void satu(){
digitalWrite(pinA, ON);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, ON);
digitalWrite(pinE, ON);
digitalWrite(pinF, ON);
digitalWrite(pinG, ON);
}

void dua(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, ON);
digitalWrite(pinD, OFF);
digitalWrite(pinE, OFF);
digitalWrite(pinF, ON);
digitalWrite(pinG, OFF);
}

void tiga(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, ON);
digitalWrite(pinF, ON);
digitalWrite(pinG, OFF);
}

void empat(){
digitalWrite(pinA, ON);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, ON);
digitalWrite(pinE, ON);
digitalWrite(pinF, OFF);
digitalWrite(pinG, OFF);
}

void lima(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, ON);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, ON);
digitalWrite(pinF, OFF);
digitalWrite(pinG, OFF);
}

void enam(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, ON);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, OFF);
digitalWrite(pinF, OFF);
digitalWrite(pinG, OFF);
}

void tujuh(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, ON);
digitalWrite(pinE, ON);
digitalWrite(pinF, ON);
digitalWrite(pinG, ON);
}

void delapan(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, OFF);
digitalWrite(pinF, OFF);
digitalWrite(pinG, OFF);
}

void sembilan(){
digitalWrite(pinA, OFF);
digitalWrite(pinB, OFF);
digitalWrite(pinC, OFF);
digitalWrite(pinD, OFF);
digitalWrite(pinE, ON);
digitalWrite(pinF, OFF);
digitalWrite(pinG, OFF);
}

void sepuluh(){
digitalWrite(pinA, ON);
digitalWrite(pinB, ON);
digitalWrite(pinC, ON);
digitalWrite(pinD, ON);
digitalWrite(pinE, ON);
digitalWrite(pinF, ON);
digitalWrite(pinG, ON);
}