An Arduino mini pro provides the brains ... If you need help reprogramming the HC-05 Bluetooth module, we’ve covered that before. This project drew inspiration from [Evan’s] similar project ...

It’s hard to imagine an easier way to set up communications between an Android device and an Arduino using Bluetooth ... the cheap and ubiquitous HC-05 Bluetooth module. Having picked up one ...

Fortunately, Bluetooth modules like the HC-05 and HC-06 can send serial signals wirelessly ... Just reverse the receive (Rx) and transmit (Tx) lines between your Arduino and Bluetooth module, and ...