The SW-520 Tilt Ball Switch (also known as the 2801 ball sensor) is a compact, vibration-sensitive tilt sensor that uses a rolling metal ball to detect changes in orientation or motion. When tilted or shaken, the ball inside makes or breaks contact with internal electrodes, creating a simple digital ON/OFF signal. This sensor is widely used in DIY electronics, Arduino projects, and security systems where detecting motion, tilt, or vibration is needed. It's low-cost, passive (non-powered), and easy to interface with microcontrollers.
Features
Simple ON/OFF digital tilt or vibration detection
Works by internal rolling ball making electrical contact
No power supply required – passive device
Fast response to tilt and vibration
Can be used in any orientation
Durable metal and plastic housing
Easy to interface with microcontrollers like Arduino, ESP32, etc.
Ideal for anti-theft alarms, orientation detection, and motion-triggered systems
