In final form, a Bluetooth module and Arduino Pro Micro are stuffed inside the stereo along with a DPDT relay to switch the I2C bus. An external button is used to trigger the Arduino to switch to ...

A FT-232 USB to serial board is used to program the Arduino. A standard Bluetooth module has to have HID firmware installed. [Dastardly] makes a homemade daughterboard–er, shield–to connect ...

Just reverse the receive (Rx) and transmit (Tx) lines between your Arduino and Bluetooth module, and provide the proper input voltage level. This method requires zero software pairing; your device and ...

Makers, developers and hobbyists that are looking for a low-cost Bluetooth ... module and Atmega328p to communicate both messages from the client which can be PC, Mac, iOS or Android to the Arduino.