SW-420 Vibration Sensor Module 3.3V-5V LM393 Alarm Switch for Arduino

🔧 SW-420 Vibration Sensor Module | AuscomTech

The SW-420 Vibration Sensor Module is a compact shock and vibration detection board designed for Arduino, ESP32, STM32, and other microcontroller projects.

It uses a normally closed SW-420 vibration switch together with an LM393 comparator to provide a clean digital high/low output signal when vibration is detected. The onboard potentiometer allows the sensitivity threshold to be adjusted to suit different applications.

This module is commonly used in alarm systems, anti-tamper projects, equipment monitoring, motion-triggered devices, and DIY automation where simple digital vibration detection is required.

⭐ Key Features

• SW-420 vibration switch – Normally closed sensor responds to shock or vibration events.
• LM393 comparator – Provides stable digital switching output with clean signal waveform.
• Adjustable sensitivity – Onboard trimmer potentiometer lets you tune the trigger threshold.
• 3.3V to 5V operation – Suitable for common Arduino and other microcontroller platforms.
• Digital output – Outputs logic 0 or 1 for simple connection to input pins.
• Status LEDs – Power indicator and switch signal indicator for quick visual checking.
• Compact PCB – Small board size makes installation easy in tight projects.
• Mounting hole – Fixed bolt hole allows convenient mechanical mounting.

📊 Technical Specifications

• Sensor Type: SW-420 normally closed vibration switch
• Comparator: LM393
• Operating Voltage: 3.3V to 5V DC
• Output Type: Digital switching output
• Output Levels: 0 / 1 logic signal
• Drive Capability: Greater than 15mA
• Sensitivity Adjustment: Onboard potentiometer
• PCB Size: Approx. 3.2cm × 1.4cm
• Interface Pins: DO, GND, VCC

🧩 Typical Applications

• Vibration alarm systems
• Shock detection projects
• Anti-tamper enclosures
• Equipment vibration monitoring
• DIY security devices
• Motion-triggered electronics
• Arduino and ESP32 sensor projects

⚠️ Important Notes

• Digital output only – this module does not provide analogue signal output.
• When the module is not vibrating, the switch is closed and the output is low.
• When vibration occurs, the switch momentarily disconnects and the output goes high.
• Sensitivity should be adjusted to suit the installation environment and vibration level.
• Colour and minor PCB details may vary slightly between batches.

📦 Package Includes

• 1 × SW-420 Vibration Sensor Module

🔗 Recommended Accessories (Not Included)

• Arduino UNO or Nano – for quick testing and project integration
• Dupont jumper wires – for connecting the module to development boards
• Breadboard – for prototyping without soldering
• Active buzzer module – for building simple vibration alarm systems