int RelayControl1 = D1;    // relay Pin
int RelayControl2 = D2;
int RelayControl3 = D3;
int RelayControl4 = D4;


void setup()
{
  Serial.begin(9600);
  pinMode(RelayControl1, OUTPUT);
  pinMode(RelayControl2, OUTPUT);
  pinMode(RelayControl3, OUTPUT);
  pinMode(RelayControl4, OUTPUT);
}


void loop() //se ponavlja
{

  digitalWrite(RelayControl1,HIGH);// ON
  delay(1000); //Delay (pauza) Millis
  digitalWrite(RelayControl1,LOW);// OFF
  delay(1000);
  digitalWrite(RelayControl2,HIGH);
  delay(1000);
  digitalWrite(RelayControl2,LOW);
  delay(1000);
  digitalWrite(RelayControl3,HIGH);
  delay(1000);
  digitalWrite(RelayControl3,LOW);
  delay(1000);
  digitalWrite(RelayControl4,HIGH);
  delay(1000);
  digitalWrite(RelayControl4,LOW);
  delay(1000);
}