//EX 1.5 4 EXTERNAL LEDS TO PICO AND CREATE A SEQUENCE OF RUNNING LEDS
/*
void setup() {
  // put your setup code here, to run once:
  for (int i = 0; i < 4;i++) 
  pinMode(i, OUTPUT);
}

void blink (int i) {
  digitalWrite(i, HIGH);
  delay(500);
  digitalWrite(i, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1); // this speeds up the simulation
  for (int k = 0; k < 4; k++){
    blink(k);
  }
}
*/
//EX 1.6 4 EXTERNAL LEDS TO PICO AND CREATE A SEQUENCE OF RUNNING LEDS IN ALTERNATING DIRECTION
void setup() {
  // put your setup code here, to run once:
  for (int i = 0; i < 4;i++) pinMode(i, OUTPUT);
}

void blink (int i) {
  digitalWrite(i, HIGH);
  delay(500);
  digitalWrite(i, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1); // this speeds up the simulation
  for (int k = 0; k < 4; k++){
    blink(k);
  }
  for (int rev = 3; rev != 0; rev--) blink(rev);
}