The HC-05, a Bluetooth to serial bridge, can be found for around $5 on the internet and therefore may be the cheapest way to add Bluetooth connectivity to your project. However, its default setting… ...

Posted in Arduino Hacks, LED Hacks, Transportation Hacks Tagged arduino nano, bicycle, hc-05, QI, turn signal, weatherproof ← Programmable Air Makes Robotics A Breeze Headlight Mod For An Audi ...

The $22 kit includes an Arduino-BLE board and 6-pin header that should be fairly broadly applicable for building Arduino-based hardware that can communicate with iOS devices.