Tilt sensors are essential components in security alarm systems today. Standalone tilt sensors sense tilt angle or movement. Tilt sensors can be mounted using mechanical threading, magnets, or adhesives, depending on what type of surface they are being mounted to.

Module Features: 1: Highly sensitive switch SW-520D as the angle sensor. 2: Clean output signal, good waveform, drive more than 15mA device. 3: Working voltage 3.3V-5V 4: Digital output format: HIGH or LOW 5: Easy installation 6: PCB board size: 3.2cm x 1.4cm 7: Wide voltage comparator LM393

The type SW-520D is a commonly available roller-ball type tilt sensor consisting of two conductive elements (poles) and a conductive free mass (rolling ball), encapsulated in the same case.

Electronics circuitry behind this tiny module is usually centered around the dual- comparator chip LM393. The module features a tilt sensor, a signal amplifier, a standard 4-pin header, a power indicator that signals that the module is correctly powered, and a status indicator that lights up when a tilt is detected by the tilt sensor.

When the tilt sensor is in its upright position, the ball inside the tilt sensor bridges the two contacts, completing the circuit. When the board is tilted, the ball moves, and the circuit opens. When upright, the module outputs 0V (L) and when it is tilted, it outputs 5V (H) through the digital output (DO) terminal of the 4-pin header. If the analog output (AO) of the module is connected to an analog input (for example A0) on the Arduino you can expect to read a value of 0 (0V) when it is in its upright position and 1023 (5V) when it is tilted.

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