SW-420 Vibration Sensor Module & Alarm Switch for Arduino
SW-420 Vibration Sensor Module & Alarm Switch for Arduino
SW-420 Normally Closed Vibration Sensor Module
The SW-420 Vibration Sensor Module is a compact, reliable switching transducer designed for Arduino and other microcontroller-based projects. Using a resistance-based sensing principle with a normally closed configuration, this module triggers an alarm output the moment vibration or movement is detected — making it ideal for DIY security systems, motion-triggered alerts, and smart automation builds.
Made in Mainland China.
Key Features
- Normally Closed (NC) Design: Circuit remains closed at rest and opens upon vibration, providing reliable trigger signals for alarm and automation applications.
- SW-420 Vibration Switch: High-sensitivity resistance sensor that detects even subtle vibrations, knocks, or shakes.
- Switching Transducer Output: Digital output signal compatible with Arduino, Raspberry Pi, and most 3.3V/5V microcontroller boards.
- Durable Metal Construction: Robust metal housing built for repeated use in prototyping and embedded system projects.
- Easy Integration: Simple 3-pin interface (VCC, GND, DO) for quick wiring and immediate use in your circuit.
- Customizable Sensitivity: Adjustable onboard potentiometer lets you fine-tune vibration detection threshold to suit your project needs.
- Compact & Lightweight: Small form factor fits neatly into breadboards and enclosures without bulk.
Typical Applications
- DIY burglar and intrusion alarm systems
- Anti-theft vehicle and object monitoring
- Earthquake or shock detection prototypes
- Smart home automation triggers
- Robotics and Arduino maker projects
Specifications
- Model: SW-420
- Type: Normally Closed Vibration Switch / Resistance Sensor
- Output: Digital Switching Transducer
- Material: Metal
- Compatibility: Arduino, Raspberry Pi, and 3.3V–5V microcontroller systems
- Origin: Made in Mainland China
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Frequently Asked Questions
Q: What does "normally closed" mean for the SW-420 vibration sensor module?
A: A normally closed (NC) sensor means the internal switch circuit is closed (conducting) when at rest. When vibration or movement is detected, the switch opens and changes the output signal. This makes the SW-420 ideal for alarm systems that need to detect any disturbance and immediately trigger a response.
Q: Is the SW-420 vibration sensor module compatible with Arduino?
A: Yes! The SW-420 vibration sensor module is fully compatible with Arduino boards (Uno, Nano, Mega, etc.) as well as Raspberry Pi and other 3.3V–5V microcontrollers. It features a simple 3-pin interface (VCC, GND, Digital Output), so you can wire it up quickly and start reading vibration signals with minimal code.
Q: Can I adjust the sensitivity of the vibration switch module?
A: Yes. The module includes an onboard potentiometer that allows you to adjust the vibration detection sensitivity. Turn it to make the sensor respond to very light taps or only to stronger impacts, depending on your project requirements.
Q: What kind of projects can I build with the SW-420 sensor module?
A: The SW-420 is commonly used in DIY alarm systems, anti-theft devices, earthquake detection prototypes, smart home automation triggers, and robotics projects. Anywhere you need to detect motion, shock, or vibration in an Arduino or microcontroller circuit, this module is a great fit.