Blinking electroluminescent wire

neon_blink.ino

// Blinking sign
// Instructables Build Night with Cool Neon

const int p[] = {13, 12, 11};  // List of pins with connected EL wires
const int pn = 3;  // number of connected wires

void setup() {
  delay(200);  
  for( int i = 0 ; i < pn ; i++ ) { // declare all the Cool Neon channels as outputs
      pinMode(p[i], OUTPUT);
      digitalWrite(p[i], HIGH);
  }  
}

void loop() {
  for( int i = 0 ; i < pn ; i++ ) {
      if (random(2) > 0) {   // 50% chance
          digitalWrite(p[i], LOW);   // Light on
      } else {
          digitalWrite(p[i], HIGH);  // Light off
      }
  }
  delay(100 * random(1, 9));  // random delay between next cycle
}