Pete and Kylen making it happen with arduino

Alternating:

void setup() {

  pinMode(13, OUTPUT);

  pinMode(12, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

    digitalWrite(9, HIGH);

    delay(500);

    digitalWrite(13, LOW);

    delay(800);

    digitalWrite(9, HIGH);

    delay(800);

    digitalWrite(13, LOW);

    delay(500); 

}

Changing Speeds:

void setup() {

  pinMode(13, OUTPUT);

  pinMode(12, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

    digitalWrite(9, HIGH);

    delay(300);

    digitalWrite(13, LOW);

    delay(900);

    digitalWrite(9, HIGH);

    delay(900);

    digitalWrite(13, LOW);

    delay(300);

}

Count:

void setup() {

  pinMode(13, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  int count = 0;