Project Resonance
2026HW123 IMU · heart-rate fusion · Titan haptics · PlatformIO
Wrist-worn fall detector that fuses accelerometer and heart-rate data to confirm real falls, then alerts via haptic, audio, and LCD — fully offline, ~2 s latency.
Overview
Project Resonance is a wrist-worn fall detector that fuses accelerometer and heart-rate data to identify critical falls in real time. When a fall is detected, the device triggers haptic feedback to alert the wearer and nearby caregivers. It works entirely offline with no WiFi or internet required, with detection latency around 2 seconds.
Key features
- Two-stage detection: HW123 impact exceeding ~5g, then heart-rate rise >20 bpm within 2 seconds to reject false positives.
- Hardware stack: HW123 gyro/accel, Gravity heart-rate sensor, 1.28" round LCD, Titan Haptics Dev Kit, piezo buzzer/speaker.
- Custom 3D-printed wearable housing with mechanical isolation so haptic actuators don’t corrupt IMU readings.
- Event-driven firmware with Kalman-filtered heart-rate and fixed-point math for low-power embedded timing.