/*
 TDD: Test Driven Desgin    / BDD

 INPUT:   2   =>  INPUT
 LED: 3 pwm

 serial:  1: led full,  2: led off
 */

void setup() {

  pinMode(2,INPUT_PULLUP); //  default: HIGH,  >>>>> /GND/
  Serial.begin(9600);


}

void loop() {
  Serial.println(digitalRead(2));
  delay(30);

}