// sketch 01_04_serial
int switchPin = 7;

void setup()
{
  pinMode(switchPin, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop()
{
  if (digitalRead(switchPin) == LOW)
  {
    Serial.println("Paperclip connected");
  }
  else
  {
    Serial.println("Paperclip NOT connected");
  }
  delay(1000);
}