LighterJack
Bluetooth proximity app built in React Native using a Nordic Semiconductor BLE chip as a peripheral device. Establishes connection with BLE chip, uses Kalman Filter algorithm to clean out noise from RSSI values. Implements QR Scanner, Background Processing, and Local/Push Notifications. Alerts central device (phone) when peripheral device (microchip) is going out of range.

https://github.com/mattelianyc/LJ2