SW420 Normally Closed Vibration Sensor Module Vibration Alarm Module for DIY Electronics Product overview A compact normally closed vibration sensor module based on the SW420 switch element. Designed to act as a reliable vibration trigger for alarm systems, remote monitoring, and DIY electronics projects. The sensor provides a simple switchstyle output that changes state when vibration or shock is detected. Key benefits Detects vibration quickly and reliably: responds to shocks and movement to trigger alarms or inputs. Normally closed operation: stays in a closed state until vibration causes the contact to open, making it suitable for failsafe alarm designs. Easy to integrate: connects directly to digital inputs on microcontrollers, alarm panels, or relay circuits for fast deployment. Compact and durable: small PCB footprint and metal sensor element fit into tight enclosures and resist typical mechanical wear. Low power and simple operation: no complex setup required, ideal for hobbyist and professional use. Important attributes Function: vibration detection using a normally closed SW420 switch element that changes state on vibration. Model: SW420 vibration sensor module, normally closed type. Compatibility: works with common microcontrollers and single board computers such as Arduino and Raspberry Pi as a digital input trigger; also suitable for alarm panels and relay interfaces. Size and form factor: compact PCB module suitable for mounting inside enclosures, sensor element sized for embedded applications. Material and build: metal sensor element paired with a PCB module for robust mechanical response and straightforward wiring. Performance: fast mechanical response for detecting shocks and intermittent vibration events. Suitable for use as a binary trigger for alarms or monitoring systems. Typical applications Security alarm systems: detect windows, doors, or fixtures being struck or moved and trigger an alarm or notification. Equipment monitoring: detect unexpected vibration in pumps, motors, or cabinets and send a digital alert to a controller. DIY and prototyping: integrate with Arduino or Raspberry Pi projects to add motion or tamper detection for robots, instrument cases, or interactive installations. Installation tips Mount the module securely to the structure to ensure vibration transfers to the sensor element. Connect the module to a digital input and use a pullup or pulldown configuration appropriate for normally closed operation. Test sensitivity and mounting position in the final installation to avoid false triggers from background vibration. This SW420 normally closed vibration sensor module provides a straightforward, reliable way to add vibration detection to alarm circuits and electronic projects without complex signal processing.