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SW-420 Vibration and Shock Sensor Module for Arduino

Specification	Details
Operating Voltage	DC 3.3V – 5V
Sensor Type	SW-420 (Normally Closed)
Comparator IC	LM393 High-Precision Voltage Comparator
Current Consumption	~15mA
Output Type	Digital Switching (0 & 1)
Adjustment	Onboard Sensitivity Potentiometer
PCB Dimensions	32mm x 14mm

Price

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₹ 50.85

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Barcode: 8971403

Product Description

The SW-420 Sensor Module utilizes a spring-based internal mechanism that provides a reliable digital trigger upon sensing a vibration. Unlike mercury-based switches, this sensor is non-directional and environmentally safe. The raw signal from the SW-420 element is processed by an onboard LM393 comparator, which provides a clean, noise-free TTL-compatible output (D0). The module features two onboard LEDs: a Power LED to confirm the DC supply and a Signal LED that toggles when a vibration is detected. Its small form factor and simple 3-pin interface make it perfect for integration into tight enclosures or hobbyist projects.

Key Features

Adjustable Sensitivity: Use the blue multi-turn potentiometer to set the vibration intensity required to trigger the output.
Normally Closed Design: The sensor is in a conductive state by default, providing high reliability for security applications.
LM393 Processing: Ensures a sharp digital pulse output that is easily readable by any microcontroller.
Low Power Requirement: Ideal for battery-operated IoT devices and portable alarms.
Easy Installation: Pre-drilled 3mm mounting hole for secure attachment to any vibrating surface.

Technical Details

Pinout: 1. VCC: 3.3V to 5V. 2. GND: Ground. 3. DO: Digital Output Signal.
Logic State: Output is LOW when still and HIGH when vibration is detected.
Durability: Rated for millions of vibration cycles under standard operating conditions.

Prototyping and Engineering Tips from Robogears

The "Window" of Detection: The SW-420 is excellent for detecting "sudden" impacts. If you are building a window alarm, mount the sensor directly to the glass frame. The vibration from a knock or a break will trigger the digital pin instantly.
Sensitivity Calibration: To calibrate, turn the potentiometer until the "Signal LED" just turns OFF. Now, even a light tap on the table should make the LED flicker. If it's too sensitive and triggers from a nearby fan, turn the potentiometer slightly in the opposite direction.
Interrupt Usage: In your Arduino code, connect the DO pin to an Interrupt pin (e.g., Pin 2 or 3 on an Uno). Use RISING or CHANGE mode in your attachInterrupt() function to catch the very first millisecond of a vibration, ensuring your alarm responds without delay.

Package Includes

1 x SW-420 Vibration / Tilt Sensor Module

Disclaimer

This module is a digital switch and cannot measure the "magnitude" of vibration (G-force); for variable intensity data, an analog accelerometer is required. Ensure the module is mounted firmly, as a loose sensor will provide inconsistent and "chattery" data.

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