Piezoelectric Knock Vibration Sensor Switch Module - Compoden
Piezoelectric Knock Vibration Sensor Switch Module
This module uses a piezoelectric element to convert mechanical vibrations into a digital high/low signal. It detects knocks, taps, or sustained vibration and outputs a clean TTL-level pulse. The built-in potentiometer lets you set the detection threshold for different project needs.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage | 3.3V to 5V DC |
| Output Type | Digital (High/Low) |
| Sensitivity Adjustment | Onboard potentiometer |
| Indicator LED | Yes, lights on detection |
| PCB Dimensions | 30 x 20 mm |
What You Can Build With This
- Knock-activated door lock system
- Vibration alarm for drawers or safes
- Electronic drum trigger or musical glove
- Interactive tap sensor for art installations
Compatibility
The module works with any 3.3V or 5V microcontroller board, including Arduino Uno, Nano, Mega, Raspberry Pi Pico, and ESP32. It connects directly to a single digital input pin and mirrors the vibration state as a high logic level when a knock is detected.
Wiring Notes
Connect VCC to 5V (or 3.3V), GND to ground, and DO to a digital pin. Keep the wiring short to minimise stray capacitance that can cause false triggers. Use the onboard potentiometer to fine-tune sensitivity: clockwise increases, counterclockwise reduces.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, it works with all Arduino boards. Connect DO to any digital input pin and read the signal with a simple digitalRead() in your sketch.
Can I use this as a knock sensor for a door?
Absolutely. Mount the module on a door surface, adjust sensitivity to ignore light touches, and have the microcontroller trigger an alarm or unlock mechanism on solid knocks.
How do I adjust sensitivity?
Turn the small blue potentiometer on the module. Turn clockwise for higher sensitivity (detects lighter taps), counterclockwise for lower sensitivity (only responds to stronger knocks).
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items