HKD SW-520D Vibration Sensor (Pack of 5)

The SW-520D is a compact and reliable vibration and tilt detection sensor that uses a simple roller-ball mechanism to detect physical motion or changes in orientation. Enclosed in a cylindrical brass case, the sensor contains a metal rolling ball that shifts position when tilted or vibrated, momentarily closing or opening an internal circuit. This mechanical action mimics a switch and provides a digital ON/OFF signal based on its orientation or any sudden motion.

The sensor is encapsulated in shrink tubing to prevent short circuits and provide basic environmental protection. Its non-polarized pins make it easy to connect in any direction without concern for pin order, simplifying integration into a wide range of electronic or microcontroller-based projects.

This sensor is widely used in DIY electronics, home automation, alarm systems, and robotics to detect motion, vibration, or tilt - without the need for complex signal processing or analog-to-digital conversion circuitry as required by accelerometers.

Working Principle:

When the sensor is oriented vertically with its pins pointing downward, the internal metal ball settles between the two electrical contacts, completing the circuit (switch ON). If tilted 30 to 90 from the vertical, the ball rolls away from the contacts, opening the circuit (switch OFF). The sensor therefore acts as a simple digital switch that reacts to tilt or motion.

Applications:

• Tilt or angle detection
• Motion and vibration sensing
• Anti-theft and shock detection systems
• Automatic lighting or control systems
• Hobby electronics and robotic applications
• Sleep or movement monitors
• DIY projects with microcontrollers like Arduino or Raspberry Pi

Specifications:

• Contact Rating: 12V (DC recommended)
• Contact Resistance: Less than 10 ohms
• Insulation Resistance: Greater than 10 megaohms
• Capacitance: 5 pF
• Maximum Voltage: 20V
• Maximum Current: 30mA
• Activation Angle: Switch turns ON when tilted between 30 and 90 from the vertical position
• Switch Type: Non-polarized (pins can be interchanged)
• Case Material: Brass with shrink wrap for insulation
• Quantity: Pack of 5 units

Advantages:

• Low-cost, simple motion sensing solution
• Easy to use with digital inputs
• No programming libraries required
• Minimal power consumption
• No analog-to-digital conversion needed
• Compact and easy to mount

What's in the box
x5 HKD SW-520D Vibration Sensor