Arduino door sensor (with code and schematic)

I bought an “MC-38 Door And Window Sensor” from AliExpress. And I wanted to make a Morse code machine. The first step of that was the sensor.

Schematic

Code

// main.ino

const int sensor = 5;

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

void loop() {
  /**
   * On the door sensor:
   *   0 - the circuit is complete.
   *   1 - the circuit is broken.
   */
  Serial.println(digitalRead(sensor));
  delay(200);
}

Sample output

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