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 ...

But it does automate the process of setting up the Bluetooth to serial module for use in your projects ... [James’] solution connects the device to an Arduino running a sketch that he wrote.

Check out the video below to learn more about the Bluetooth THINGY module. “We have all said it a 100 times, if we only had an App to tell us if our garage door is open late at night.