Vibration/Shock Sensor Module (SW420)

Vibration/Shock Sensor Module (SW-420) with Adjustable Digital Output

 

The Vibration/Shock Sensor Module (SW-420) is a highly sensitive and reliable solution for detecting movement, shaking, or collisions. It uses the SW-420 vibration switch paired with the LM393 voltage comparator to produce a stable digital signal. The module is configured in a Normally Closed (NC) state, meaning that its digital output remains HIGH until a vibration or shock event occurs, upon which the output quickly switches LOW.

 

This functionality makes it invaluable for security and alert systems. The module's sensitivity can be precisely controlled by adjusting the onboard potentiometer, allowing you to tune it to ignore minor disturbances while reliably catching significant shocks.

 

🔧 Key Features

 

   
• Sensor Type:SW-420 Vibration Switch (Normally Closed).
   
• Comparator: High-precision LM393 Comparator IC.
   
• Digital Output (DO): Provides a TTL-level signal (LOW upon detection).
   
• Sensitivity Control: Easily adjustable via potentiometer to set the shock threshold.
   
• Indicators: Onboard LED to visually show the digital output status.
   
• Power Supply: Wide operating voltage range of $3.3 \text{V}$ to $5 \text{V}$ DC.
   
• Installation: Features a fixed bolt hole for convenient and secure mounting.
 

 

💡 Applications

 

   
• Anti-Theft and Burglary Alarms on doors, windows, or vehicles.
   
• Robotics for collision detection and impact sensing.
   
• Automatic device activation based on vibration alerts (e.g., turning on a fan if a machine shakes excessively).
   
• Security Monitoring in sensitive equipment or machinery.
 

 

⚙️ Technical Specifications

                                                                                   

Sensor Model	SW-420
Comparator Chip	LM393
Operating Voltage	$3.3 \text{V}$ to $5 \text{V}$ DC
Output Type	Digital Switch (TTL Logic)
Detection Logic	Normally Closed (Output LOW on vibration)
Sensitivity	Adjustable (Potentiometer)
Sampling Rate	Instantaneous
Temperature Range	$-10^\circ \text{C}$ to $50^\circ \text{C}$ (Operating)
Interface Pins	VCC, GND, DO (3-Pin Header)
Typical Dimensions (L x W)	$3.2 \text{ cm} \times 1.4 \text{ cm}$

 

📦 Package Includes

 

   
• 1 × SW-420 Vibration/Shock Sensor Module