unsigned long blnkIntrvl1;
unsigned long blnkIntrvl2;
unsigned long blnkIntrvl3;
unsigned long blnkIntrvl4;
int ledState1;
int ledState2;
int ledState3;
int ledState4;

void setup() {
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
Serial.begin(9600);
Serial.println(blnkIntrvl1);

}

void loop() {

  //Serial.println(millis()); 

  // blink 1st bit every sec
if (millis() - blnkIntrvl1 >= 1000) {
  blnkIntrvl1 = millis();
  if (ledState1 == 1) {
  digitalWrite(2, LOW);
  ledState1 = 0;
  }
  else {
  digitalWrite(2, HIGH);
  ledState1 = 1;
  Serial.println(blnkIntrvl1);
  }
}

// blink 2nd bit every 2 sec
if (millis() - blnkIntrvl2 >= 2000) {
  blnkIntrvl2 = millis();
  if (ledState2 == 1) {
  digitalWrite(3, LOW);
  ledState2 = 0;
  }
  else {
  digitalWrite(3, HIGH);
  ledState2 = 1;
  Serial.println(blnkIntrvl2);
  }
}

// blink 3d bit every 4 sec
if (millis() - blnkIntrvl3 >= 4000) {
  blnkIntrvl3 = millis();
  if (ledState3 == 1) {
  digitalWrite(4, LOW);
  ledState3 = 0;
  }
  else {
  digitalWrite(4, HIGH);
  ledState3 = 1;
  Serial.println(blnkIntrvl3);
  }
}

// blink 4th bit every 8 sec
if (millis() - blnkIntrvl4 >= 8000) {
  blnkIntrvl4 = millis();
  if (ledState4 == 1) {
  digitalWrite(5, LOW);
  ledState4 = 0;
  }
  else {
  digitalWrite(5, HIGH);
  ledState4 = 1;
  Serial.println(blnkIntrvl4);
  }
}
}