The SW520D Tilt Sensor Module is a digital roller-ball switch used to detect physical orientation or movement. It acts as a binary switch (ON/OFF) that triggers when tilted past a specific threshold (typically greater than 15 degrees). It is ideal for microcontrollers like Arduino, ESP32, and Raspberry Pi.Technical Specifications

• Operating Voltage: 3.3V to 5V DC
• Onboard IC: LM393 Voltage Comparator (ensures a clean signal)
• Output Type: Digital switching signal (Logic 0 or 1)
• Trigger Angle: Greater than 15 degrees
• Internal Component: Dual metal conductive balls inside a sealed cylinder

Pin Configuration

1. VCC: Connects to 3.3V – 5V power
2. GND: Connects to ground
3. DO (Digital Output): Outputs LOW when upright (circuit closed) and HIGH when tilted (circuit open)
4. AO (Analog Output): Optional pin that provides real-time voltage variation

Working Principle

• Upright: Metal balls roll down to touch the internal terminals, bridging them to close the circuit.
• Tilted: Gravity pulls the balls away from the pins, breaking contact and opening the circuit.
• Calibration: An onboard potentiometer allows you to adjust sensitivity and filter out noise.