Hackidemia Activity 1

const int ledPin1 = 3;
const int ledPin2 = 4;
const int ledPin3 = 5;
const int ledPin4 = 6;

void setup() {
  pinMode(ledPin1, INPUT);
  pinMode(ledPin2, INPUT);
  pinMode(ledPin3, INPUT);
  pinMode(ledPin4, INPUT);
}

void loop() {
  
  //randomSequence();
  //linearSequence();    
  //oneOnAtATime();      
  pingPong();           
}

void allOff() {
  for (int i=3; i<7; i++) {
    digitalWrite(i, LOW);
  } 
}

void allOn() {
  for (int i=3; i<7; i++) {
    digitalWrite(i, HIGH);
  } 
}

void pingPong() {
  allOff();
  digitalWrite(3, HIGH);
  delay(500);
  for (int i=3; i<7; i++) {
    digitalWrite(i, HIGH);
    digitalWrite(i-1, LOW);
    delay(500);
  }
    for (int i=6; i>2; i--) {
    digitalWrite(i, HIGH);
    digitalWrite(i+1, LOW);
    delay(500);
  }

}

void oneOnAtATime() {
  allOff();
  delay(500);
  for (int i=3; i<7; i++) {
    digitalWrite(i, HIGH);
    digitalWrite(i-1, LOW);
    delay(500);
  } 
}

void linearSequence() {
  allOff();
  delay(500);
  for (int i=3; i<7; i++) {
    digitalWrite(i, HIGH);
    delay(500);
  } 
}

void randomSequence() {
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, HIGH);
  digitalWrite(ledPin4, HIGH);
  delay(500);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, HIGH);
  digitalWrite(ledPin4, LOW);
  delay(500);
  digitalWrite(ledPin1, HIGH);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, LOW);
  delay(500);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin3, LOW);
  digitalWrite(ledPin4, HIGH);
  delay(500);
}