This project is a CD Changer (CDC) emulator for Old Generation (OG) Saab 9-3 and 9-5 vehicles. This device allows the user to connect their phone to the Microchip RN52 bluetooth chip and stream music to the device, which then plays through the stock head unit. The head unit thinks a factory CDC has been married to the car and turns on the CD lines to allow the music to play.
This is v6.0, which is a complete new design; new uC and new schematic and new layout, using new layout software (Circuit Maker). Previous versions to this were done in EagleCad, using Atmel ATMega328P-AU as the brain.