SW-420 Vibration Sensor
by Generic
SKU: PSA-CMP-SW420
No reviews yetTypical India street price
₹30–₹70
Spring-contact shake switch — knock, earthquake toy, anti-theft.
Interface: Digital (comparator)
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Concept
A spring rattles against a pin, closing a circuit when shaken.
A little theory
Not a calibrated accelerometer. Threshold via LM393 pot. Debounce in software. In the classroom, treat SW-420 Vibration Sensor as a beginner part using Digital (comparator). Typical India street price is about ₹30–₹70. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
digitalRead; ignore bursts shorter than N ms.
Classroom & project use
- Bike alarm
- Washing-machine “done?”
- Tap interface
Buying in India
Precautions
- Share a common GND with the microcontroller
- Verify polarity and voltage before powering the circuit
Specifications
| Type | Spring / closed on shock |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 3.3–5V |
| Interface | Digital (comparator) |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
