In this tutorial, you'll learn how to build a fully functional Bluetooth speaker by integrating the Greycode IoT Dev Board as the Bluetooth receiver, an amplifier module to boost the audio signal, and a speaker to deliver clear sound—all encased in a custom cover for a polished and portable design.

Components Needed

• Greycode IoT Dev Board
• Amplifier Module (PAM8403)
• Potentiometer (MAX 98357A)
• 2X Speaker (3W–4 ohms)
• Jumper Wires
• C-type USB Cable

Step 1: Circuit Diagram

Use the circuit diagram below as a connection reference.

Step 2: Assemble the Components

1. Mount the Greycode IoT Dev Board at the back of your 3D printed speaker cover.
2. Place the amplifier module and potentiometer inside the speaker cover.
3. Attach wires to the speaker terminals.
4. Use jumper wires to connect all components according to the circuit diagram.

Ensure connections are secure. Avoid soldering for testing; solder permanently later.

Step 3: Code for Bluetooth Speaker

Install the Visual Studio Code IDE and load the Bluetooth speaker code into the Greycode IoT Dev Board.

Step 4: Upload the Code

1. Select the Espressif ESP32 Dev Module for the chip in PlatformIO (VS Code).
2. Connect the Greycode IoT Dev Board via USB.
3. Select the correct board and port, then upload the code.

Step 5: Test the Speaker

1. Turn on the Greycode IoT Dev Board and amplifier module.
2. Pair your phone with "Greycode".
3. Play music from your device to test sound output.

Step 6: Assemble the Cover

1. Place the amplifier inside the speaker cover.
   
2. Mount the speakers and potentiometer on the front cover, then attach it to the main cover.
   
3. Secure all components and attach the speaker legs to their designated spots.
   

Troubleshooting Tips

• No Bluetooth connection? Check the code and ensure Bluetooth is enabled.
• No sound? Verify connections to the amplifier and speaker.

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