KY-020 Tilt switch

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int tiltPin = 2;
int ledPin  = 13;

int  lastReading = HIGH;
int  stableState = HIGH;
unsigned long lastChange = 0;

void setup() {
  pinMode(tiltPin, INPUT_PULLUP); // LOW = tilted (contacts closed)
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int reading = digitalRead(tiltPin);

  if (reading != lastReading) {
    lastChange  = millis();
    lastReading = reading;
  }

  if (millis() - lastChange > 50) { // 50 ms debounce
    if (reading != stableState) {
      stableState = reading;
      digitalWrite(ledPin, stableState == LOW ? HIGH : LOW);
    }
  }
}

Рекомендуемые ссылки:
Arduino Tilt Switch Sensor KY-020 – Wiring & Code
KY-020 Tilt switch – SensorKit
How to Use Tilt Sensors on the Arduino
Using the Tilt Switch Module KY-020 with Arduino – Phipps Electronics
KeyesKY-020Tilt_Sensor_Instructions.pdf

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