Embedded Programming

Testing speaker with OLED & multi-controller 

Summary

The following project features the combination of a speaker with a rotary encoder for volume control and an OLED display for visual feedback. Currently, the system simulates simplified musical tones using a buzzer. While the project demonstrates the core system, future improvements will focus on enhancing sound quality and Bluetooth integration for a fully functional speaker.


Reflections and Future Revisions

The current demo is based on the WOKWI's online components to test its system. To develop a fully functioning Bluetooth speaker at the end of the semester, several improvements are planned:

1. Improve Audio Quality:
- Replace the buzzer with a proper speaker and integrate an MP3 decoder module or Bluetooth streaming for better sound quality.
- Utilize the rotary encoder to control both analog and digital volume.

2. Bluetooth Integration:
- Although Arduino Nano 2040 has a built-in Bluetooth system, it probably still needs to add a Bluetooth module (e.g., ESP32 or CSR8675) to stream high-quality audio with advanced codec support.

3. Power and Amplification:
- Incorporate the vacuum tube amplifier for richer sound and ensure the power supply can handle both the amplifier and Bluetooth module.

4. Aesthetic and Functional Enhancements:
- Refine the enclosure design to showcase the vacuum tubes and enhance the OLED display to provide real-time feedback.
- Evaluate the actual sizes of boards, power supply, wires, etc. So that it is possible to integrate with the final envelope design.