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 ...

An Arduino with an HC-05 Bluetooth adapter took care of driving the LEDs and wireless communications, respectively. A wooden frame later, and the whole thing is ready to go.