//int var = 1;      // variable to store the read value

const int ledPin = 2;  
int ledState = LOW;  
unsigned long previousMillis = 0; 
const long interval = 1000;  

void setup() {

  pinMode(ledPin, OUTPUT);

}

void loop() {

  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }
    digitalWrite(ledPin, ledState);
  }
}


//////////////////////////////

void ledPin2 () {
  digitalWrite(2, 1); // sets the LED on
  delay(500);  
  digitalWrite(2, 0); // sets the LED on
  delay(500);  
}

void ledPin3 () {
  digitalWrite(3, 1); // sets the LED on
  delay(500);  
  digitalWrite(3, 0); // sets the LED on
  delay(500);  
}

void ledPin4 () {
  digitalWrite(4, 1); // sets the LED on
  delay(500);  
  digitalWrite(4, 0); // sets the LED on
  delay(500);  
}

void ledPin5 () {
  digitalWrite(5, 1); // sets the LED on
  delay(500);  
  digitalWrite(5, 0); // sets the LED on
  delay(500);  
}