4relayWith.ino

int red = 3;
int green = 4;

int relay3 = 5;
int relay4 = 6;

int delay_1 = 50;

void setup() {
  
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);

}

void loop(){
  for(int i=0; i<10; i++){
    digitalWrite(red, HIGH);
    digitalWrite(relay3, HIGH);
    delay(delay_1);
    digitalWrite(red, LOW);
    digitalWrite(relay3, LOW);
    delay(delay_1);
  }
  digitalWrite(red, LOW);
  digitalWrite(relay3, LOW);
  for(int i=0; i<10; i++){
    digitalWrite(green, HIGH);
    digitalWrite(relay4, HIGH);
    delay(delay_1);
    digitalWrite(green, LOW);
    digitalWrite(relay4, LOW);
    delay(delay_1);
  }
  digitalWrite(green, LOW);
  digitalWrite(relay4, LOW);
}