JUST TAP YOUR UNIVERSITY ID TO GET A LOCKER.
XERO KEY SECURITY // 12-BAY Locker
XERO KEY SECURITY // HARDWARE & CLOUD ARCHITECTURE
Engineered for high-reliability physical access control. The Xero Key hardware node operates on an ESP32 microcontroller paired with a NFC transceiver and a 12-channel opto-isolated relay array. Asynchronous dual-slot state machines allow concurrent check-in and check-out operations with 500KB LittleFS ring-buffer protection and 15-second live heartbeat telemetry.
Strict 7-byte UID hardware validation with non-blocking asynchronous solenoid actuation and magnetic door monitoring.
Simultaneous 1x Check-In and 1x Check-Out state tracking with real-time tri-color LED status arbitration.
Authenticated hardware heartbeats verify live ESP32 connectivity within a strict 30-second watchdog window.
Self-pruning 500KB LittleFS offline CSV storage paired with DS3231 RTC timestamps prevents flash overflow during outages.