SafeCharm
IoT wearable safety jewelry — INF 148: Designing for IoT · Group 53
The problem
Existing tracking devices prioritize function over form — bulky, obvious, and socially uncomfortable to wear. Growing data privacy concerns have further eroded trust in location-based tech. Users want safety and peace of mind without feeling surveilled, stigmatized, or aesthetically compromised.
Key design decisions
SafeCharm embeds secure GPS tracking, geofencing alerts, movement detection, and jewelry-removal sensing into a fully customizable charm bracelet. The core design constraint was invisibility: every sensor had to fit inside a charm housing no larger than a typical pendant, mounted on a custom PCB (18×12×4mm). Privacy was non-negotiable — end-to-end encryption, no third-party data selling, and an optional local-only tracking mode.
What I learned
Designing hardware is a UX problem. Every component choice — from the BNO055 IMU to the magnetic reed switch clasp detector — had a direct impact on what the user would feel and trust. The most important insight: in wearable safety tech, trust is the product. Transparency about what data is collected and who controls it matters more than any feature.
Key features
Real-time tracking
Live GPS location via u-blox MAX-M10S
Safety zones
Geofence alerts for home, school, work
Removal detection
Magnetic reed switch detects clasp opening
Discreet design
Fully customizable sterling silver / stainless
vs. competitors