With a single LED and a single resistor, we can HELLO WORLD our arduino with a flashing LED. Of course I am no embedded programmer so I recoile at using C. Luckily there are other embedded languages available to the Arduino Uno, which I happen to be using.

1. Hello World
2. Required Software
3. Required Hardware (Arduino Uno, LED, Resistor)
4. Assembly
5. uLisp Flash
6. Code Upload via Serial

For this I will be using Arduino Studio, tio, uLisp.

• Arduino Uno
• USB A MALE CABLE
• 22K RESISTOR
• LED

GPIO.13 –> 22K –> LED –> GND

1.1. Open Arduino Studio 1.2. Copy ulisp.ino into Arduino Studio 1.3. Upload

2 Code Upload Via Seria

tio -b9600 /dev/ttyACM0

Your serial device may be different from mine ttyACM0. Use Arduino Studios Auto Detection to find your Arduino.

;; is-prime? -> bool
(defun pri (n)
  (let ((d 2))
    (loop
     (when (> (* d d) n) (return t))
     (when (zerop (mod n d)) (return nil))
     (incf d))))

;; prime-blink-led-pin -> nil
(defun bli (pin)
  (pinmode pin t)
  (dotimes (x 32767)
    (when (and (> x 1) (pri x))
      (dotimes (f (* x 2))
        (digitalwrite pin (evenp f))
        (delay 250))))
  '())

;; led-n-times-between-dly-ms -> nil
(defun alt (pin n dly)
  (pinmode pin t)
  (dotimes (x (* 2 n) )
    (digitalwrite pin (evenp x))
    (delay dly))
  (delay dly)
  '())

;; alternate-blink-n-times-delayed -> nil
(defun ald (pin n dly)
  (pinmode pin t)
  (dotimes (x (* 2 n))
     (delay dly))
  '())


(ald 13 20 100)