// Project 5 - LED Chase Effect
// Create array for LED pins
byte ledPin[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
int ledDelay(65); // delay between changes
int direction = 1;
int currentLED = 0;
unsigned long changeTime;
void setup() {
 // set all pins to output
 for (int x=0; x<10; x++) {
 pinMode(ledPin[x], OUTPUT); }
 changeTime = millis();
}
void loop() {
 // if it has been ledDelay ms since last change
 if ((millis() - changeTime) > ledDelay) {
 changeLED();
 changeTime = millis();
 }
}
void changeLED() {
 // turn off all LED's
 for (int x=0; x<10; x++) {
 digitalWrite(ledPin[x], LOW);
 }
 // turn on the current LED
 digitalWrite(ledPin[currentLED], HIGH);
 // increment by the direction value
 currentLED += direction;
 // change direction if we reach the end
 if (currentLED == 9) {direction = -1;}
 if (currentLED == 0) {direction = 1;}
}