void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);

}

int val;
bool newM, M;

void loop() {
  // put your main code here, to run repeatedly:
  delay(1);
  // Serial.println(millis()/1000%2);
  digitalWrite(2, millis()/1000%2);
  digitalWrite(3, millis()/500%2);
  digitalWrite(4, millis()/350%2);
  digitalWrite(5, millis()/170%2);


  M = millis()/1000%2;
  if( M != newM ){
    newM = M;
    val++;
    Serial.println(val);

  }

}