//-----------  Simplest serial send from Arduino -------------
//  (-View output using Serial Monitor in Arduino Interface.)
//------------------------------------------------------------

void setup() {                   // Only do once at startup       
  Serial.begin(9600);            // start serial port at 9600 bps:
}
void loop()  {                   // repeat forever  
    Serial.println("A");         // Send message to serial (USB)
    delay(500);                  // delay a half second
    Serial.println("1");         // Send message to serial (USB)
    delay(500);                  // delay a half second
}