void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  Serial.println("Hello Arduino");
}

void loop() {
  // put your main code here, to run repeatedly:

  while(Serial.available()) {
    // get the character
    char ch = Serial.read();

    // echo the character to serialaaaa monitor or PuTTY
    Serial.print("You enter : ");
    // Serial.write(ch);
    Serial.println(ch);
  }
}