Arduino button without resistor pull up or pull down

Buttons are everywhere, many of our projects using button to interact with users. Many tutorials told us to use resistor as pull up or pull down for button. And maybe you have question and that’s why you are here. Does resistor really needed? Can we just skip the resistor and using only button?. Hmmmm fortunately the answer is yes! The arduino has internal pull up resistor that you can use it so you don’t need resistor to use your button.

So, how do we do that? Here’s the schematic example :

Or this

And this is the code:

int button = 2;

void setup() {
  // put your setup code here, to run once:
  pinMode(button, INPUT);
  digitalWrite(button, HIGH); //activate arduino internal pull up
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(button)==LOW){
    Serial.println("Button is pressed");
  }
  delay(500);
}

How is it? Do you love it? Comment below.