saab-93NG-bluetooth-aux

A module to augment the Aux-In functionality of SAAB 93NG's (2002/3+), to add Bluetooth media playback and steering wheel media control support.

September 30th 2022 update - PCB ordered!

Features

• Bluetooth music playback through the wired AUX port
• Steering wheel button controls
  • Play / Pause
  • Next / Previous
  • WIP Voice Assistant
  • WIP Accept incoming phone call
• [SOON] Digital Microphone support
• [FUTURE] SID integration for automatic Aux-switching
• [FUTURE] SID augmentation, to show music track names etc.

Project Layout

• /hardware/saab_bluetooth_aux_kit
  • Version 1 hardware. Very basic, breakout-module-based. KiCAD 5
• /hardware/saab_bluetooth_aux_kit_v2
  • Version 2 of the 'kit'. WeMos LOLIN32-Lite module is used as the MCU. Some SMD components for power supply and CAN. Multiple through-hole DAC options (PCM5102, UDH1334H). KiCAD 6.
• /hardware/esp32_93NG_btaux_v2
  • Version 2 hardware, unfinished. Intention was to use full-SMD components, and have multiple CAN interfaces. Currently too much work, and not as approachable for newbies.
• /esp32_a2dp_reciever
  • PlatformIO project, the software flashed to the ESP32 module.
  • Utilises the Arduino for ESP32 framework.

Version 1, Prototype

The first edition of the PCB serves only to wire together some off-the-shelf modules, after they were tested on a breadboard.

Prototype parts

• ESP32 NodeMCU Board (30-pin variant)
• Adafruit I2S to Stereo DAC (UDA1334)
• MCP2515 CAN-bus to SPI interface module