//int LEDs[] = {8,9,7,6,4,3,2};        // for Arduino microcontroller
//int LEDs[] = {D2,D1,D3,D4,D6,D7,D8}; // for ESP8266 microcontroller
int LEDs[] = {2,15,0,16,4,17,5};    // for ESP32 microcontroller

int uno[] = {1, 0, 0, 1, 1, 1, 1};   // LED states to display number one
int dos[] = {0, 0, 1, 0, 0, 1, 0}; // LED states to display number eight
int tres[] = {0, 0, 0, 0, 1, 1, 0};
int cuatro[] = {1, 0, 0, 1, 1, 0, 0};

void numeros(int nro){
  switch(nro)
  {
    case 1:
      for (int i = 0; i<7; i++) digitalWrite(LEDs[i], uno[i]);
      break;
     case 2:
      for (int i = 0; i<7; i++) digitalWrite(LEDs[i], dos[i]);
      break;
    case 3:
      for (int i = 0; i<7; i++) digitalWrite(LEDs[i], tres[i]);
      break;
    case 4:
      for (int i = 0; i<7; i++) digitalWrite(LEDs[i], cuatro[i]);
    break;
  }
}

void setup() {
  for (int i = 0; i<7; i++) pinMode(LEDs[i], OUTPUT);
}

void loop() {
  numeros(4);
  delay(1000);
  numeros(3);
  delay(1000);
}