Info
product url - Vibration Shake Sensing Module, LM393 SW18020P
This module uses a normally-open, high-sensitivity vibration switch (SW-18010P). At rest the switch is open (OFF). When subject to an impact or sufficient acceleration/centrifugal force, the internal contact momentarily closes (ON); when the force is removed the switch returns to the open (OFF) state.
Typical uses: vibration-triggered alarms, smart vehicles, educational electronic blocks, and general vibration sensing. The sensor board includes an M3 mounting hole for easy fixing and orientation. It uses an LM393 comparator for a clean, conditioned signal with good drive capability (over 15 mA). Sensitivity is adjustable via the on-board precision potentiometer.
Schematic
Operation and behavior
- When the product is not vibrating the vibration switch is open; the module output is HIGH and the green indicator LED is off.
- When vibration occurs, the switch momentarily closes and the output goes LOW; the green indicator LED turns on.
- The output can be connected directly to a microcontroller input. The MCU can monitor the pin state to detect vibration and trigger alarms or other logic.
Quick test procedure
- Connect VCC and GND (observe correct polarity). The power LED should light.
- Place the module on a flat surface. Rotate the blue potentiometer until the switch indicator LED lights, then slightly turn the pot back so the LED is off.
- Tap the surface to produce vibration — the switch indicator LED should light while vibration is detected and turn off when vibration stops.
This demonstrates that vibration triggers the module and lights the indicator.
Caution
- Wire the module correctly — do not reverse VCC and GND, as this can damage components.
- The trigger pulses produced by the sensor on small vibrations are very short and usually cannot directly drive a relay. Although some sources claim direct relay connection works, practical results are often unreliable. Use a driver or latch circuit if you need to switch higher currents or drive a relay.
Board Map, Dimension, Pins, chip info, Use Guide, Setup Jumper, etc.
Applications, category, tags, etc.
Demo Code and Video
ref
Documentation: Reference schematic please refer to this post.
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