ESP32_bluetoothmedia
An esp32 used as a2dp sink attached to the bmw canbus for steering wheel controls
Imported libs
Used parts
- ESP32: https://de.aliexpress.com/item/33004561102.html
- External DAC: https://de.aliexpress.com/item/1005004491534008.html
- CAN transceiver: https://de.aliexpress.com/item/1005002844175352.html
- AUX pinout adapter (not really necessary, since the external DAC has output pins to attatch to): https://www.amazon.de/gp/product/B009PH1IG4
- DC 8V-32V to DC 5V transformer: https://www.amazon.de/gp/product/B09B818N5F
- Random USB-A to USB-C cable
Wireing
- CAN 3.3V -> ESP 3.3V
- CAN Ground -> ESP Ground
- CAN RX -> ESP pin D4 (GPIO 4)
- CAN TX -> ESP pin D5 (GPIO 5)
- DAC 3.3V -> ESP 3.3V
- DAC Ground -> ESP Ground
- DAC FLT -> ESP Ground
- DAC DMP -> ESP Ground
- DAC SLC -> ESP Ground
- DAC BCK -> ESP pin D26 (GPIO 26)
- DAC DIN -> ESP pin D22 (GPIO 22)
- DAC LCK -> ESP pin D25 (GPIO 25)
- DAC FMT -> ESP Ground
- DAC XMT -> ESP 3.3V
- ESP USB-C -> Transformer USB-A
Remember to short the pins on the can transceiver, if you don't need the 120 Ω resistor as an endpoint.
Features
- Automatic reconnect to the last connected device is handled by the ESP32-A2DP-library
Todos (maybe?)
- Set volume on bluetooth connect automatically to the maximum of the bluetooth device
Ideas for your own implementation:
- a2dp can receive information about the song that is currently playing. You could attach a display to show the current artist and title.