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.

We’ve had very few car radios from scratch here at Hackaday, but we have had more than one bluetooth upgrade or addition of a line-in port. Thanks [Darkspr1te] for the story.

Have you ever wanted to build yourself a 2WD Electric Car and control it wirelessly especially through your Android application? In this post, I am going to share some concepts and simple working ...

Thanks to the LightBlue Bean+, however, one of those roadblocks has been torn down. The Bean+ is basically an Arduino board that can be programmed via Bluetooth LE.

Your robot army, controlled by Arduino and Bluetooth Open-source hardware project shrinks Arduino, adds wireless, creates awesome.

Unlocking your car isn't exactly tough, but if you want to spice it up a bit, The Mercuino Project shows off how to unlock your doors with Bluetooth and an Arduino.