ATmega32u4 (Leonardo) with Nordic nRF8001 Bluetooth LE and 9/10 DOM/DOF orientation-sensing IMU
See Cordova/README/bleUART/README.md for Ionic framework + Android SDK setup info.
The Cordova/ folder contains Cordova (Phonegap) example apps using the Ionic Framework meant for an iOS or Android device that supports Bluetooth 4.0