{"product_id":"sw-420-vibration-sensor-module-alarm-switch-for-arduino","title":"SW-420 Vibration Sensor Module \u0026 Alarm Switch for Arduino","description":"\n\u003ch2\u003eSW-420 Normally Closed Vibration Sensor Module\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Closed (NC) Design:\u003c\/strong\u003e Circuit remains closed at rest and opens upon vibration, providing reliable trigger signals for alarm and automation applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSW-420 Vibration Switch:\u003c\/strong\u003e High-sensitivity resistance sensor that detects even subtle vibrations, knocks, or shakes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitching Transducer Output:\u003c\/strong\u003e Digital output signal compatible with Arduino, Raspberry Pi, and most 3.3V\/5V microcontroller boards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Metal Construction:\u003c\/strong\u003e Robust metal housing built for repeated use in prototyping and embedded system projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Integration:\u003c\/strong\u003e Simple 3-pin interface (VCC, GND, DO) for quick wiring and immediate use in your circuit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable Sensitivity:\u003c\/strong\u003e Adjustable onboard potentiometer lets you fine-tune vibration detection threshold to suit your project needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Small form factor fits neatly into breadboards and enclosures without bulk.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY burglar and intrusion alarm systems\u003c\/li\u003e\n  \u003cli\u003eAnti-theft vehicle and object monitoring\u003c\/li\u003e\n  \u003cli\u003eEarthquake or shock detection prototypes\u003c\/li\u003e\n  \u003cli\u003eSmart home automation triggers\u003c\/li\u003e\n  \u003cli\u003eRobotics and Arduino maker projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SW-420\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Normally Closed Vibration Switch \/ Resistance Sensor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e Digital Switching Transducer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Arduino, Raspberry Pi, and 3.3V–5V microcontroller systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/led-fishing-bite-alarm-bells-2-pack-rod-clip-freshwater-saltwater\"\u003eLED Fishing Bite Alarm Bells with Light – 2 Pack for All Rods\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does \"normally closed\" mean for the SW-420 vibration sensor module?\u003c\/h4\u003e\n\u003cp\u003eA: A normally closed (NC) sensor means the internal switch circuit is \u003cstrong\u003eclosed (conducting) when at rest\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the SW-420 vibration sensor module compatible with Arduino?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I adjust the sensitivity of the vibration switch module?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What kind of projects can I build with the SW-420 sensor module?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does \\\"normally closed\\\" mean for the SW-420 vibration sensor module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A normally closed (NC) sensor means the internal switch circuit is closed (conducting) when at rest. 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