The KY-031 Percussion Knocking Knock Sensor Module is a compact and reliable vibration detection module designed for Arduino, Raspberry Pi, ESP32, ESP8266, AVR, PIC, STM32, and other microcontroller development platforms. This sensor detects physical knocks, taps, impacts, and vibrations and converts them into a digital signal output, making it ideal for security systems, alarm projects, smart automation, interactive electronics, and DIY embedded applications.

The module operates with a wide voltage range of 3.3V to 5V, allowing seamless integration into both 3.3V and 5V development boards. Its simple digital output design makes it easy to connect and program, making it suitable for beginners, students, hobbyists, and professional developers.

Features:

• Detects knocks, taps, shocks, impacts, and vibrations

• Compatible with Arduino and various microcontroller platforms

• Digital High/Low output signal

• Wide operating voltage range from 3.3V to 5V

• Fast response to physical movement and vibration

• Compact PCB design for easy installation

• Built-in mounting holes for secure attachment

• Suitable for automation, security, and monitoring systems

• Easy interfacing with digital input pins

• Low power consumption

• Reliable vibration sensing performance

• Ideal for educational and DIY electronics projects

Applications:

• Knock detection systems

• Anti-theft alarm projects

• Vibration monitoring devices

• Smart home automation

• Security and intrusion detection systems

• Interactive electronic projects

• Impact sensing applications

• Industrial monitoring prototypes

• Motion-triggered electronics

• Educational STEM and robotics projects

• Equipment vibration monitoring

• Door knock detection systems

How to Use:

• Connect the VCC pin to 3.3V or 5V power supply.

• Connect the GND pin to the microcontroller ground.

• Connect the signal output pin to a digital input pin of the microcontroller.

• Upload the appropriate program to detect HIGH or LOW digital state changes.

• Mount the sensor securely using the provided bolt holes.

• Position the sensor on the surface where vibration or knocking needs to be detected.

• Monitor digital output signals for knock or vibration events.

Working Principle:

• The sensor detects physical impacts, knocks, or vibrations.

• Internal sensing elements react to mechanical movement.

• When a knock or vibration occurs, the module generates a digital output signal.

• The connected microcontroller reads the signal and triggers programmed actions such as alarms, notifications, LEDs, relays, or data logging.

Installation Instructions:

• Power the module using a compatible 3.3V or 5V source.

• Secure the module using mounting holes for accurate detection.

• Avoid loose mounting to prevent false readings.

• Connect output directly to a digital GPIO pin.

• Test sensitivity through software logic and installation positioning.

• Use shielding or vibration isolation when operating in noisy environments.

Benefits:

• Simple digital signal output for easy programming

• Compatible with most popular development boards

• Compact and lightweight design

• Cost-effective solution for vibration detection

• Reliable performance in embedded systems

• Suitable for beginners and professionals

• Excellent choice for smart sensing applications

• Easy integration into existing projects

Specifications:

• Model: KY-031

• Operating Voltage: 3.3V – 5V

• Output Type: Digital (High/Low)

• Installation: Bolt holes for mounting

• Application: Vibration and knock detection for microcontroller input

Package Includes:

• 1 x KY-031 Percussion Knocking Knock Sensor Module for Arduino

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