I’m working on a DIY project that combines embedded audio hardware with the functionality of open-source music streaming apps — like BlackHole APK and ViMusic. My goal is to build a portable music streaming device (offline or Bluetooth-based), powered by STM32 + external DAC + Bluetooth module, that can pull content from a paired phone running an open-source app.
Here’s what I’m exploring so far:
:wrench: Concept Setup:
MCU: STM32F4 series (considering its DSP and audio capabilities)
Audio Output: I2S interface + external DAC (PCM5102A)
Bluetooth: HC-05 or newer BLE modules
Storage: SD card or onboard flash for offline playback
Power: Rechargeable Li-Po + charging circuit (TP4056)
:light_bulb: Inspiration from Open-Source Apps:
I've been testing apps like BlackHole APK and ViMusic, which support offline downloads, high-quality streaming (320kbps), and clean UIs. I run a small project blog at bhapk.com where I write about these apps and how they can be used beyond smartphones — like powering offline devices or custom Android builds.
:question_mark: What I Need Help With:
Any STM32 models you’d recommend specifically for low-latency audio handling?
Best way to buffer and stream audio over Bluetooth from a phone to STM32?
Should I integrate a basic UI (OLED) or go headless and control via phone app?
Any examples of STM32 + Bluetooth + Audio codec projects to learn from?
I’m open to suggestions on modules, firmware libraries (HAL, LL, STM32Cube), and even real-time OS ideas if needed for smoother streaming.
Thanks in advance — I’ll document the build on the blog as it evolves!
Best regards,
Mr Blogger
https://bhapk.com
