In this project I reverse engineer the interface between my BMW stereo head unit and CD changer with the goal to replace it by my own Bluetooth audio interface.
Aug 20, 2020
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.
Jun 21, 2020
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.
May 1, 2020
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.
Nov 22, 2019
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.
Oct 10, 2019
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.
Jun 29, 2019
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.