Description
The KY-021 Tilt Switch Module is a compact and efficient sensor that detects small changes in orientation, ideal for adding tilt or motion detection to Arduino, Raspberry Pi, and microcontroller projects.
This module uses a ball-type mechanical tilt switch, which closes the circuit when tilted to a certain angle. It outputs a digital HIGH or LOW signal, making it perfect for fall detection, motion-activated systems, anti-tamper alarms, or orientation-based triggers.
Due to its miniature design, the KY-021 is especially suited for projects with space constraints, including robotics, wearables, and compact embedded systems.
- Module: KY-021
- Sensor Type: Mini Ball Tilt Switch
- Function: Detects angular movement
- Output Type: Digital (0 or 1)
- Operating Voltage: 3.3V – 5V
- 3-Pin Interface: VCC, GND, Digital Output (DO)
- Switch Type: Normally open, closes on tilt
- Module Size: 19mm x 15mm x 7mm
Key Features:
- Module: KY-021
- Function: Tilt detection using a mini ball switch
- Output: Digital signal based on orientation
- Mercury-free and environmentally safe
- Operating Voltage: 3.3V – 5V
- 3-pin interface: VCC, GND, DO
- Compatible with Arduino, Raspberry Pi, ESP32, etc.
- Small and lightweight for space-limited projects
What’s Included:
- 1x KY-021 Mini Tilt Switch Module
Great For:
- Fall Detection in Robotics
- Motion Alarms & Anti-Tamper Systems
- Orientation Sensing in Compact Devices
- Wearable Tech Projects
- STEM Kits & Educational Applications
- DIY Smart Devices & Automation
Usage Tips:
- Use digitalRead() in Arduino to detect tilt events
- Tilt causes a LOW signal (when contact closes)
- Add software debouncing for stability if needed
- Mount on a vertical or angled surface for best sensitivity
- Ideal where space-saving motion sensing is required
