An Obnoxious Blinky LED Sketch

rando-blink.pde

// rando-blink ala https://www.arduino.cc/en/Tutorial/Blink

void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(13, HIGH); 
  delay(random(50, 100)); 
  digitalWrite(13, LOW);    
  delay(random(50, 100)); 
}