/*
==== Task 4 - LED Chase Sequence Using a Function ====
              Author: Roberto Palozzo
======================================================
*/

// Turns on a single LED for "delayTime" ms, then turns it off
void lightLED(int ledPin, int delayTime) {
  digitalWrite(ledPin, HIGH);   // turn LED on
  delay(delayTime);             // keep it on
  digitalWrite(ledPin, LOW);    // turn LED off
}

void setup() {
  pinMode(4, OUTPUT);           // set pin 4 as output
  pinMode(5, OUTPUT);           // set pin 5 as output
  pinMode(6, OUTPUT);           // set pin 6 as output
  pinMode(7, OUTPUT);           // set pin 7 as output
}

void loop() {
  lightLED(4, 200);             // fast blink — 200 ms on/off
  lightLED(5, 200);             // chase to next LED
  lightLED(6, 200);             // chase to next LED
  lightLED(7, 200);             // chase to last LED, then loop repeats
}