The SW-420 Vibration Sensor Module is a simple and reliable motion detection module designed to detect vibrations, shocks, or sudden movements. It is widely used in security systems, machine monitoring, and embedded projects where vibration-based event detection is required. The module provides both digital output and sensitivity adjustment, making it easy to integrate with microcontrollers.
Core Module Specifications
• Sensor Type: Mechanical vibration sensor (SW-420)
• Detection Method: Vibration and shock sensing
• Output Type: Digital (HIGH / LOW)
• Sensitivity Adjustment: Onboard potentiometer
Electrical & Interface
• Operating Voltage: 3.3 V – 5 V
• Logic Level: TTL compatible
• Interface Pins: VCC, GND, DO
• Output Response: Active HIGH on vibration detection
• Comparator IC: LM393
Performance Characteristics
• Detection: Responds to vibration, knocks, and movement
• Response Time: Fast (real-time trigger)
• Sensitivity Range: Adjustable from low to high vibration levels
• Stability: Digital output reduces noise-related fluctuations
Physical Characteristics
• Module Type: PCB-mounted vibration sensor
• Sensor Element: Cylindrical spring-type vibration switch
• Form Factor: Compact and lightweight
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• STM32, AVR, PIC microcontrollers
• Raspberry Pi GPIO
Key Advantages
• Simple digital output, no ADC required
• Adjustable sensitivity using onboard potentiometer
• Low cost and easy to use
• Suitable for both beginner and advanced projects
Technical Insights
• LM393 comparator converts analog vibration signal to digital output
• Threshold level can be tuned using the onboard potentiometer
• Best suited for vibration detection, not precise measurement
• Can be used with interrupts for instant detection
Applications
• Anti-theft and security alarms
• Earthquake or shock detection prototypes
• Machine vibration monitoring
• Smart door or window sensors
• DIY alert and notification systems
Pro Tip
• Fine-tune the potentiometer to avoid false triggering
• Mount the sensor firmly to the surface for accurate vibration detection
• Use software debouncing if false triggers occur
Package Includes
• 1 × SW-420 Vibration Sensor Module