Skip to Content
  1. All products
  2. 🧠 Controllers & Systems
  3. 📡 Sensors & Modules
  4. KY-031 Tap Sensor Module for Arduino and Robotics
  5. 📡 Sensors & Modules
Pricelist: Retail Price (B2C) Pricelist
Pricelist: Retail Price (B2C) Pricelist
KY-031 Tap Sensor Module for Arduino and Robotics

KY-031 Tap Sensor Module for Arduino and Robotics

(0 review)
SpecificationDetails
Operating Voltage3.3V to 5V DC
Output TypeDigital Signal (High/Low)
Sensor TypeSpring-based Vibration Switch
Pin ConfigurationSignal (S), VCC (+), Ground (-)
Dimensions~19mm x 15mm
Price
₹ 50.85 ₹ 50.85
(Tax included)

Barcode: 319832

Product Description

This Tap Sensor is widely used in interactive projects, such as "knock-to-unlock" systems, vibration alarms, or as a simple user-interface trigger for wearables. Because it provides a binary digital output, it is incredibly easy to code for Arduino, Raspberry Pi, or ESP32. The module usually includes a built-in resistor to ensure signal stability and prevent "floating" inputs.

Key Features

  • High Sensitivity: Capable of detecting even light finger taps or surface bumps, making it more responsive than standard tilt switches.

  • Plug-and-Play: Features a standard 3-pin header that connects directly to breadboards or female-to-male jumper wires.

  • Low Power Consumption: Draws almost zero current when in an idle state, making it perfect for battery-powered IoT devices.

  • Durable Design: The internal spring mechanism is protected by a plastic housing, ensuring consistent performance over thousands of trigger cycles.

  • Wide Voltage Range: Works perfectly with both 3.3V and 5V logic, allowing it to interface with modern low-power microcontrollers without a level shifter.

Technical Details

  • Onboard LED: Some versions include a status LED that flashes when a tap is detected.

  • Response Time: Near-instantaneous mechanical trigger.

Prototyping and Engineering Tips from Robogears

  • Debouncing is Essential: Because the internal trigger is a vibrating spring, a single tap might generate multiple "on/off" signals in a few milliseconds (mechanical bounce). Use a software debounce (a 50ms delay or a timer check) in your code to ensure one tap is counted as one action.

  • Mounting Orientation: For maximum sensitivity, mount the sensor vertically or flat against the surface you expect to be tapped. If it is mounted loosely, the spring may not make consistent contact.

  • Pull-Up/Down Resistors: Most KY-031 modules have a built-in resistor. However, if your signal is inconsistent, ensure you have enabled the INPUT_PULLUP mode on your Arduino pin or added an external 10k resistor.

  • Sensitivity Limitation: Note that this is a "switch" and not an "accelerometer." It cannot tell you how hard the tap was; it only tells you that a tap occurred. For measuring the force of a hit, consider a Piezo Vibration Sensor.

Package Includes

  • 1 x Tap Sensor Module (KY-031 Style)

Disclaimer

Avoid using this sensor in environments with constant heavy machinery vibration, as it will trigger continuously.