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Tilt Sensor Module
Tilt sensors allow you to detect orientation or inclination. It acts like a switch. When the tilt sensor is in horizontal position, it is open. When rotate (tilt), the switch is closed and pass the current.
They are small, inexpensive, low-power and easy-to-use. Their simplicity makes them popular for toys, appliances and many other applications.
Inside the can are a pair of balls that make contact with the pins when the case is upright. Tilt the case over and the balls don't touch, thus not making a connection.
There are numerous uses for these basic sensors, but keep in mind you might need to use some debouncing code. By debounce code we mean to check twice in a short period of time to make sure that the output is not HIGH because of vibration in your project but because of real orientation