BLE Key

ESP32 Secure BLE Key is an open-source Bluetooth Low Energy access-control system that uses an ESP32-C3, a native Kotlin Android app, and a Garmin Connect IQ watch app. It authenticates commands using HMAC-SHA256 challenge-response authentication and can trigger a car remote, gate, garage door, or similar low-voltage control.

While designed for automotive use, the system can be adapted to any application requiring a secure BLE-triggered action, such as doors, gates, or other access control systems. (This is not for keyless ignition/starting.)

Designed for both convenience and security:

No need to carry physical keys for everyday access Lost keys alone cannot unlock the car without the additional authentication layer Access can be restored on a new device if your phone or watch is lost, with proper authentication Power-optimised for always-on operation in a parked vehicle