An Android app for controlling a Syma X4 (218 BKT) quadcopter via Bluetooth Low Energy using a Nordic nRF51 SOC as a BLE-to-ShockBurst bridge. More information about the project is located here.
The quad_bridge_fw project turns the nRF51-DK into a BLE-to-ShockBurst bridge using the S110 SoftDevice's Multiprotocol Timeslot API. This app reads the device's accelerometer and uses it to send commands to the nRF51.