[Arduino] Serial Relay Control

#define RELAY1 4
#define RELAY2 5
#define RELAY3 6
#define RELAY4 7

int delayms = 300;
byte intBuffer[12];
String intData = "";
int delimiter = (int) '\n';


void setup() {
  // initialize digital pin 13 as an output.
  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, OUTPUT);
  switchRelay(RELAY1, 0, false);
  switchRelay(RELAY2, 0, false);
  switchRelay(RELAY3, 0, false);
  switchRelay(RELAY4, 0, false);
  delay(500);
  switchRelay(RELAY1, 0, true);
  delay(1000);
  switchRelay(RELAY1, 0, false);
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {
  /*int port = 4;
  bool state = true;
  int i = 0;
  bool side = true;
  while(true) {
    if(i == 180) {
      i = 0;
    }
    i++;
    if(port == 7) {
      state = !state;
      port = 4;
    } else {
      port++;
    }
    switchRelay(port, 0, state);
    int delayms = sin(3.14159/180.0 * i)*300;
    Serial.print(delayms);
    Serial.print("\n");
    delay(delayms);
  }*/
if (Serial.available()) {
delayms = Serial.parseInt();
}

  switchRelay(RELAY1, 0, true);
  delay(delayms);
  switchRelay(RELAY2, 0, true);
  delay(delayms);
  switchRelay(RELAY3, 0, true);
  delay(delayms);
  switchRelay(RELAY4, 0, true);
  delay(delayms);
  switchRelay(RELAY1, 0, false);
  delay(delayms);
  switchRelay(RELAY2, 0, false);
  delay(delayms);
  switchRelay(RELAY3, 0, false);
  delay(delayms);
  switchRelay(RELAY4, 0, false);
  delay(delayms);


}

void switchRelay(int port, int order, bool state) {
  digitalWrite(port, state ? LOW : HIGH);
}