int Relay1=13;
int Relay2=14;

void setup()
{
  pinMode(Relay1, OUTPUT);
  pinMode(Relay2, OUTPUT);
}
void loop()
{
  digitalWrite(Relay1, HIGH);
  digitalWrite(Relay2, LOW);
  delay(300);
  digitalWrite(Relay1, LOW);
  digitalWrite(Relay2, HIGH);
  delay(300);
}