int ledPin;

void ledPattern1();
void ledPattern2();
void ledPattern3();
void ledPattern4();

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for (ledPin=2; ledPin<6; ledPin++) {
    pinMode(ledPin, OUTPUT);
  }
  Serial.println("Enter the pattern number (1,2,3,4)");


}
void ledPattern1()
{
  for (ledPin=2;ledPin<6;ledPin++){
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
  for (ledPin=2;ledPin<6;ledPin++){
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}
void ledPattern2()
{
  for (ledPin=2;ledPin<6;ledPin++){
    digitalWrite(ledPin, HIGH);
    delay(1000);
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}

void ledPattern3()
{
  for (ledPin=5;ledPin>0;ledPin--){
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
  for (ledPin=5;ledPin>0;ledPin--){
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}
void ledPattern4()
{
  for (ledPin=1;ledPin<6;ledPin=ledPin+2){
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
 for (ledPin=2;ledPin<6;ledPin=ledPin+2){
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
   for (ledPin=1;ledPin<6;ledPin=ledPin+2){
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
 for (ledPin=2;ledPin<6;ledPin=ledPin+2){
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
if(Serial.available()>0)
{
  int reqdPattern= Serial.parseInt();
  if (reqdPattern==1)
   ledPattern1();
   else if   (reqdPattern==2)
   ledPattern2();

   else if   (reqdPattern==3)
    ledPattern3();
    else if   (reqdPattern==4)
    ledPattern4();
    else Serial.println("Invalid pattern");
}
}