For $8.60, you can buy a very simple Bluetooth serial module that works great with Arduino. It uses 4 pins: GND, VCC, TX, and RX, and has a very simplified configuration of only Name, PIN, BAUD. With a device like this, you can do simple bi-directional serial over bluetooth with a PC or Android phon…

Utility to configure JY-MCU module (inexpensive bluetooth serial)

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