Commented Code for Project 5 Chapter 3

...is it just me or is this not the same code we commented in pairs in class? Either way, here is my commented code for Project 5, Chapter 3 (which I posted about a week ago.

// Project 5 - LED Chase Effect

byte ledPin[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13};

// Array of which pins hold the LED’s (labels the LED’s)

int ledDelay(65);

// delay between changes

int direction = 1;

// direction of light movement (ex: from LED 0 to LED 1, to LED 2, one LED at a time)

int currentLED = 0;

// the current LED

unsigned long changeTime; 

//changing time with a "long" data type

void setup() {

//setup the program

for (int x=0; x<10; x++) {

//while these conditions are true [starting at x=0 while x is less than ten, add 1]

pinMode(ledPin[x], OUTPUT); }

changeTime = millis();

// change the time in milli seconds

}

void loop() {

// tells the program to constantly loop (everything in the void loop() will loop automatically

if ((millis() - changeTime) > ledDelay) {

//if ((millis() - changeTime) > ledDelay) is true, start the “change LED” function (next line below) and change the time to milliseconds (last line before } bracket)

changeLED();

changeTime = millis();

}

}

void changeLED() { 

// change LED function (that was called on previously) and everything below is what happens in this function

for (int x=0; x<10; x++) {

// while these conditions are true [starting at x=0 while x is less than ten, add 1] turn off all LED's (line below)

digitalWrite(ledPin[x], LOW);

}

digitalWrite(ledPin[currentLED], HIGH);

// when the “if” statement is not true, turn on the current LED

currentLED += direction;  

// increment by the direction value

if (currentLED == 9) {direction = -1;}

// change direction if we reach the end

if (currentLED == 0) {direction = 1;}

// change direction if we reach the beginning again

}