ATTiny Christmas Ornament

// ATTiny85 based Christmas ornament
// Written by Brian Gosney aka UnaClocker December 2011
// Creative Commons FTW

void setup() {
  pinMode(0, OUTPUT); // Clock pin
  pinMode(1, OUTPUT); // Data pin
  pinMode(2, OUTPUT); // Latch pin
  pinMode(3, INPUT); // Analog input for randomizer
  randomSeed(analogRead(3)); // Doesn't NEED to be random, but why not..
}

void loop() {
  pinMode(2, LOW); // Drop the latch pin
  delay(20);
  shiftOut(1, 0, MSBFIRST, random(255)); // shift out a random number, causing random lights to come on.
  delay(20);
  pinMode(2, HIGH); // Raise the latch, activating the new set of lights.
  int temp = random(15)+1; // Random number between 1 and 15
  delay(temp*100); // Delay between 100 and 1500ms.
}