Vibration Sensor Module for Arduino SW-520D

Vibration Sensor Module for Arduino (SW-520D) is a sensitive, non-directional motion and tilt detection module designed to trigger digital signals upon physical vibration, shaking, or angular rotation. Built around the high-sensitivity SW-520D rolling ball ball-switch and an onboard LM393 dual differential voltage comparator IC, this module provides both clean digital (ON/OFF) output and raw analog sensitivity adjustment. Featuring a high-precision trimmer potentiometer for threshold tuning and an active indicator LED, it is an essential component for alarm systems, anti-theft security devices, impact detectors, and interactive motion-activated robotics.

Features

• Equipped with the reliable SW-520D ball-type rolling contact sensor ensuring high-sensitivity vibration and tilt response
• Powered by the LM393 dual comparator chip providing clean, stable digital switching output
• Onboard sensitivity adjustment potentiometer allowing precise threshold tuning for minor or major shocks
• Dual output interface providing both digital switch output (DO) and raw analog voltage output (AO)
• Active indicator LEDs for power status (Red) and vibration trigger detection (Green)
• Standard 4-pin interface (VCC, GND, DO, AO) compatible with 3.3V and 5V microcontroller logic
• Compact PCB size with a pre-drilled mounting hole for effortless mechanical installation
• Maintenance-free, long-lasting mechanical contact switch suitable for low-power event logging

Applications

• Anti-theft vibration alarms, automobile security systems, and bicycle motion monitors
• Earthquake detectors, impact shock indicators, and structural vibration loggers
• Smart toy motion triggers, interactive lighting effects, and tilt-activated switches
• Washing machine imbalance detectors, appliance drop sensors, and tamper-proof enclosures
• Polytechnic diploma, university engineering thesis, and Arduino/ESP32 sensor experimentation

Important Notes:

• Non-Directional Nature: The SW-520D utilizes a rolling ball inside a cylindrical tube, meaning it detects motion and vibration from any angle, though it is not designed to measure exact multi-axis acceleration like an IMU (e.g., MPU6050).
• Chattering / Debouncing: Vibration switches can generate contact bounce (rapid high/low transitions) when triggered. Implement simple software debouncing or a short delay in your microcontroller code to prevent false multiple triggers.
• Potentiometer Tuning: Rotate the blue onboard potentiometer screw clockwise or counter-clockwise to calibrate the trigger sensitivity threshold based on your application environment.
• Logic Compatibility: Connect VCC to 3.3V or 5V (matching your microcontroller logic), GND to Ground, and DO to any digital input pin on your Arduino, ESP32, or Raspberry Pi.

Package includes

• 1 x Vibration Sensor Module with LM393 Comparator and SW-520D Sensor