Delayed relays switch

static const byte ident_pins[] = {2, 3, 4, 5, 13, A2, A5}; // poradi a pouzite piny lze samozrejme libovolne menit
byte action_nr = 255;
unsigned long startMillis;
unsigned long currentMillis;
const unsigned int refreshPeriod = 100;
unsigned long startMillisRelay;

void setup() {
  Serial.begin(9600);

  for (byte i = 0; i < (sizeof(ident_pins) / sizeof(ident_pins[0])); i++) {
    pinMode(ident_pins[i], OUTPUT);
  }
  /// Pouze pro testování ///
  /// Test ALL relay ON
  action_nr = 1;

}


void loop() {
  currentMillis = millis();
  if (currentMillis - startMillis >= refreshPeriod)
  {
    switch (action_nr) {
      case 0:
        change_all_relays(0, 1000); //// dle libosti změnit prodlevu v ms
        break;

      case 1:
        change_all_relays(1, 1000); //// dle libosti změnit prodlevu v ms
        break;
    }
    startMillis = currentMillis;
  }
}

/// change ALL relays status
void change_all_relays(byte action, unsigned int switch_delay) {

  if (action_nr == 255) {
    action_nr = action;
  }

  if (currentMillis - startMillisRelay >= switch_delay)
  {
    switch (action) {
      /// Set pins state OFF
      case 0:
        for (byte i = 0; i < (sizeof(ident_pins) / sizeof(ident_pins[0])); i++) {
          if (i == ((sizeof(ident_pins) / sizeof(ident_pins[0])) - 1))
          {
            action_nr = 255;
          }
          if (digitalRead(ident_pins[i]) == 1) {
            digitalWrite(ident_pins[i], 0);
            /// pouze pro debug
            Serial.print(F("Pin:"));
            Serial.print(ident_pins[i]);
            Serial.print(F("\t"));
            Serial.print(F("Stav:"));
            Serial.println(digitalRead(ident_pins[i]));
            //////
            startMillisRelay = currentMillis;
            break;
          }
        }
        break;

      /// Set pins state ON
      case 1:
        for (byte i = 0; i < (sizeof(ident_pins) / sizeof(ident_pins[0])); i++) {
          if (i == ((sizeof(ident_pins) / sizeof(ident_pins[0])) - 1))
          {
            action_nr = 255;
          }
          if (digitalRead(ident_pins[i]) == 0) {
            digitalWrite(ident_pins[i], 1);
            /// pouze pro debug
            Serial.print(F("Pin:"));
            Serial.print(ident_pins[i]);
            Serial.print(F("\t"));
            Serial.print(F("Stav:"));
            Serial.println(digitalRead(ident_pins[i]));
            //////
            startMillisRelay = currentMillis;
            break;
          }
        }
        break;
    }
  }
}