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Tilt Alarm (Arduino)

Beep when something is tipped or moved, using a ball tilt sensor. Learn to read an orientation switch.

Beginner15 min

What you need

Wiring

Arduino Uno
Tilt sensor
Piezo buzzer

Hover a pin or a wire to trace the connection.

Code

tilt_alarm.ino
// Beep when the tilt sensor is tipped past its angle.
const int tiltPin = 2;
const int buzzer  = 8;

void setup() {
  pinMode(tiltPin, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  // Upright the ball usually closes the contacts (LOW); tilted = open (HIGH).
  if (digitalRead(tiltPin) == HIGH) {
    tone(buzzer, 800, 100);
    delay(120);
  } else {
    noTone(buzzer);
  }
}

Steps

  1. Wire the tilt sensor: one leg to D2, the other to GND.
  2. Wire the buzzer: + to D8, − to GND.
  3. Upload — tipping the sensor sets off short beeps.
  4. If it's triggered upright instead, flip the HIGH/LOW logic.