In this project [Ryan] shows how he added Bluetooth audio to the stock stereo of his Toyota Matrix. The work he did with his add-on hardware is quite good. And the installation was surprisingly easy.
A simple Bluetooth module designed for wiring into car audio systems ... However, it requires adding in a Arduino or similar that can speak I2C, a DPDT relay, and some supporting components.
You can even change the whole stereo head unit to a new one with ... On the positive side, it’s one of the cheapest ways to add a Bluetooth functionality to your car and it has a lot of features.
A Bluetooth audio adapter is also called a Bluetooth audio "receiver." See Bluetooth audio. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.
Plus, they're cheap enough that you can get two and make for a pretty impressive stereo pair. Whether you're looking for one Bluetooth speaker or five of them, or you simply want something you can ...