00_blinky.ino

/* Activity 00 - Blinky

  Turns LED on for one second, then off for one second, repeatedly.
  Sends a serial message indicating whether LED is "on" or "off".
  Uses onboard LED connected to pin 13.
*/

#define LED_PIN 13  // define LED pin

// put your setup code here, to run once:
void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  // initialize digital pin 13 (LED) as an output
  pinMode(LED_PIN, OUTPUT);
}

// put your main code here, to run repeatedly:
void loop() {
  digitalWrite(LED_PIN, HIGH);  // turn the LED on
  Serial.println("on");         // tell PC LED is on
  delay(1000);                  // wait for a second
  digitalWrite(LED_PIN, LOW);   // turn the LED off
  Serial.println("off");        // tell PC LED is off
  delay(1000);                  // wait for a second
}