A recap of the project showing all iterations of the PCB design for my Bluetooth adapter. I am happy to say that you can finally order one.

An isolated DC/DC converter is added to the PCB to remove audible alternator whine when the my bluetooth solution is installed in my BMW.

The third updated version of my Bluetooth board has arrived. In this post I test if the overheating and sound quality issues are fixed in the latest design.

The ESP32 Pico from my first Bluetooth PCB is replaced by a conventional ESP32 module. Further testing is done to see if all functionality is as intended.

There are still some few minor issues in my first BMW Bluetooth module prototype. To resolve these, I start the process of designing my own circuit board.

Reverse engineering the interface between my BMW E36 325i head unit and CD changer with the goal to develop a plug and play Bluetooth audio interface.