Description
The 801S Vibration Switch Sensor Module is a compact, omnidirectional shock and vibration detection board designed for anti-theft alarms, motion-triggered wake-up circuits, and mechanical vibration monitoring. Its sensing element is the 801S vibration probe, a cylindrical component containing a flexible spring suspended around a central pin. At rest, the spring does not make contact. When subjected to shock or vibration, inertia causes the spring to oscillate and briefly touch the metal housing, closing the circuit for a fraction of a second . An onboard LM393 comparator converts these rapid, bouncing contact closures into a clean digital output, with a potentiometer allowing sensitivity (trigger threshold) adjustment .
This 3-pin version provides only a digital output (DO)—it lacks the analog output (AO) found on some 4-pin variants . The module operates from 3.3V to 5V, making it directly compatible with Arduino, ESP32, and most microcontroller platforms. Detection is non-directional (omnidirectional), meaning it responds to vibration from any axis . The compact PCB typically measures approximately 32×14mm or 41×15mm depending on the batch, with mounting holes for secure installation .
Important limitation: This module detects the presence of vibration/shock, not its magnitude, frequency, or direction . The output pulse is brief; for sustained alarm signaling, a microcontroller latch or monostable circuit is required.
Features
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801S Spring-Probe Sensing Element: Omnidirectional vibration detection with high sensitivity to light taps and shocks .
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LM393 Comparator with Clean Digital Output: Converts chaotic mechanical bouncing into a stable digital signal for direct MCU interfacing .
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Adjustable Sensitivity Potentiometer: Onboard trimpot allows threshold tuning to reduce false triggers from ambient vibration .
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Wide Voltage Compatibility (3.3V–5V): Works with both 3.3V and 5V logic systems .
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Non-Directional Detection: Responds to vibration from any orientation, simplifying mounting requirements .
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Compact PCB with Mounting Holes: Small footprint with pre-drilled holes for secure installation .
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Indicator LED: Provides visual feedback during calibration and troubleshooting .
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Brief Trigger Pulse: Detection events are momentary; latching logic in software is recommended for alarm applications .
Technical Specifications
| Parameter | Specification |
|---|---|
| Sensor Element | 801S vibration probe (spring-type) |
| Comparator IC | LM393 |
| Operating Voltage | DC 3V – 5V |
| Output Type | Digital (DO only on 3-pin version) |
| Output Drive Capability | TTL-level compatible |
| Detection Type | Omnidirectional (non-directional) |
| PCB Size | Approx. 32×14mm or 41×15mm (varies by batch) |
| Operating Temperature | -40°C to +85°C (typical, varies by source) |
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