Description
Description
The 5V Normally Closed Shock Sensor Relay Module is a specialized vibration and impact detection device designed for fail-safe industrial equipment protection, security systems, and critical automation applications. Operating on a standard 5V DC supply—compatible with USB power, Arduino, Raspberry Pi, and other microcontroller platforms—this module combines a highly sensitive piezoelectric shock/vibration sensor with a built-in relay that opens (deactivates) when physical impact or excessive vibration is detected.
Unlike Normally Open (NO) modules, this device features a Normally Closed (NC) relay configuration, meaning the relay remains closed (active) under normal conditions and opens (interrupts the circuit) only when a shock event occurs. This is the industry standard for fail-safe applications: if the module loses power, the relay opens, safely shutting down connected equipment. This design is essential for protecting critical machinery, preventing damage, and ensuring operator safety.
The module includes an adjustable sensitivity potentiometer, allowing you to set the precise impact threshold required for triggering, from light taps to heavy shocks. The onboard LM393 comparator processes the sensor signal and provides clean, bounce-free triggering. A green LED indicator confirms normal operation (relay closed), and the LED extinguishes when a shock is detected. The sensor element is compact and can be mounted remotely on vibrating machinery, doors, windows, or structural elements.
Whether you need to shut down a CNC machine upon excessive vibration, protect conveyor systems from jams, detect unauthorized access to equipment cabinets, trigger emergency stops during seismic events, or provide impact detection for industrial robots, the 5V Normally Closed Shock Sensor Relay Module delivers reliable, fail-safe protection without requiring complex programming or PLC integration.
Key Features
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Normally Closed (NC) Default State – Relay remains closed (active) under normal conditions; opens (shuts down) when shock is detected. Fail-safe design – power loss = safe state (relay opens).
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Adjustable Sensitivity – Onboard potentiometer allows precise setting of impact/vibration threshold, from light taps to heavy shocks.
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5V DC Operation – Compatible with USB power, Arduino, Raspberry Pi, and standard 5V power supplies.
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Piezoelectric Shock Sensor – Fast response to physical impacts and vibrations; solid-state design with no moving parts.
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LM393 Comparator IC – Provides stable, noise-immune threshold detection with adjustable hysteresis.
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Built-in SPDT Relay – Controls external devices up to 10A / 250V AC or 10A / 30V DC.
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Dual Output Terminals – Both NC (Normally Closed) and NO (Normally Open) available for flexible wiring, but NC is the primary fail-safe output.
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Status Indicator LED – Green LED illuminates when relay is closed (normal operation); turns off when shock is detected.
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Compact Design – Small footprint for easy installation inside control panels, equipment enclosures, or security housings.
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Fail-Safe Operation – Relay opens automatically on power failure, ensuring connected equipment stops safely.
Technical Parameters
| Parameter | Value |
|---|---|
| Operating Voltage | 5V DC (±5%) |
| Current Consumption | ≤ 30 mA (standby, relay closed) / ≤ 70 mA (relay open after shock) |
| Sensor Type | Piezoelectric vibration/shock sensor |
| Sensitivity Adjustment Range | Adjustable via potentiometer (approx. 0.1g to 10g trigger threshold) |
| Relay Output Type | Normally Closed (NC) – opens on shock detection (fail-safe) |
| Relay Contact Rating | 10A / 250V AC or 10A / 30V DC (resistive load) |
| Output Terminals | 3-pin screw terminal (COM, NO, NC) |
| Response Time | ≤ 10 ms (typical) |
| Operating Temperature | -20°C to +60°C |
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