The SW-520D is a ball-type tilt and vibration switch, not a mercury switch. A conductive ball moves inside and opens or closes the contact with orientation and vibration.
Wiring
Read the switch with an internal or external pull-up, or use a breakout that includes a comparator. Check whether the module output is active-high or active-low because boards differ.
Programming
Apply time debouncing and require a stable state before driving an LED or buzzer. It is not an angle sensor; its trigger orientation depends on mounting and vibration.
Use
It suits approximate tilt/opening alarms and simple shock detection. Use a calibrated accelerometer for quantitative angle or motion measurement.
Engineering review: verify the library version, module operating voltage, and the actual board pinout before wiring; visually similar breakout boards can differ.
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