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 ...

We would look at this can call it an HC ... Connect the device, launch the terminal monitor in the Arduino IDE, then give it your desired settings. The sketch will poll the Bluetooth module ...

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 ...