// PRACTICA DISPLAY 0-9999 //

byte Led[] = {23, 22, 21, 19, 18, 5, 17};  
byte Bar[] = {16, 4, 2, 15};  
unsigned long intervalo = 150, ValorAnterior = 0;
int cuenta = 0;  
byte Dig[4] = {0, 0, 0, 0};  
byte seg[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};  

void setup() {
  for (byte i = 0; i < 7; i++) {  
    pinMode(Led[i], OUTPUT);
  }
  for (byte i = 0; i < 4; i++) {  
    pinMode(Bar[i], OUTPUT);
    digitalWrite(Bar[i], HIGH);  
  }


  for (byte i = 0; i < 4; i++) {
    Dig[i] = 0;  
  }
}

void loop() {
  
  if (millis() - ValorAnterior >= intervalo) {
    ValorAnterior = millis();  
    cuenta++;  
    if (cuenta >= 10000) cuenta = 0;  


     Dig[3]= cuenta/1000;
    Dig[2]=(cuenta-(Dig[3]*1000))/100;
    Dig[1]=(cuenta-(Dig[3]*1000)-(Dig[2]*100))/10;
    Dig[0]= cuenta-(Dig [3]*1000)-(Dig[2]*100)-(Dig[1]*10);          
  }

  for (byte i = 0; i < 4; i++) {
    barrido(i);  
    Display(seg[Dig[i]]);  
    delay(5); 
    Display(0x00);  
  }
}

void barrido(byte digito) {
  for (byte i = 0; i < 4; i++) {
    digitalWrite(Bar[i], HIGH);  
  }
  digitalWrite(Bar[digito], LOW);  
}

void Display(byte pattern) {
  for (byte i = 0; i < 7; i++) {
    digitalWrite(Led[i], (pattern & (1 << i)) ? HIGH : LOW);
  }
}