emily.pde

void setup() {
  Serial.begin(115200);  
  for (int i = 1; i <= 12; i++) {
    /* Set pins 12-18 to output, and strobe them to test. */
    pinMode(i, OUTPUT);
    digitalWrite(i, HIGH);
    delay(100);
    digitalWrite(i, LOW);
  }
}

void loop()          
{
  int i = 0;
  int numMails = 0;
  delay(2000);
  
  switch (Serial.available()) {
    /* Serial.available() is the number of bytes waiting.  Convert from 
     * ASCII val to an int.  Intentional switch-case fall through below. 
     */
    case 3:
      numMails = Serial.read();
      numMails -= 48;
      numMails *= 10;
    case 2:
      numMails += Serial.read();
      numMails -= 48;
      numMails *= 10;
    case 1:
      numMails += Serial.read();
      numMails -= 48;
      break;
    default:
      /* If >3 chars, just clear out the incoming buffer. */
      while (Serial.available())
        Serial.read();
      return;
  }

  for (int i = 1; i <= 12; i++) {
    // strobe!
    digitalWrite(i, HIGH);
    delay(100); // this delays the strobe
    digitalWrite(i, LOW);
  }
}