Radio Speaker

Static-Speaker

View PCB on KiCanvas

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This is my custom radio combined with a speaker designed for the YSWS Static I chose this project to upgrade the standard kit by integrating an M18 Bluetooth module alongside the original RDA5807 FM radio chip, transforming it into a permanent Bluetooth speaker for my bedroom while keeping the physical over-the-air FM radio chip!

Features:

• Bluetooth audio streaming directly from a phone
• Over-the-air local FM Radio playback
• One physical push-button to switch modes
• Dual analog potentiometers for volume control

CAD Model:

PCB

Schematic

Layout

PCB

Firmware Overview

Runs on CircuitPython using an RDA5807 library wrapper. A code.py script handles I2C tuning for the FM radio, manages the M18 module's mute line via pin A3 (BT_MUTE), and toggles between Bluetooth and FM sources using a push button (SW1).

File structure

There's 3 main folders: Firmware, PCB, and Production. The PCB folder contains .kicad_pcb, .kicad_pro, and .kicad_sch. The Firmware folder contains files for the Seeed Xiao code. The production folder will have files for the PCB printing.

BOM (Bill of Materials):

Here should be everything you need to make this speaker Most things should be what static sends you except the bluetooth module.

• 1x Seeed Studio XIAO RP2040
• 1x MH-M18 Bluetooth Audio Module
• 1x RDA5807FP FM Radio Tuner Chip
• 1x TDA2822 Audio Amplifier Chip
• 1x WH148 10kΩ Potentiometer
• 4x 1kΩ Resistors
• 1x 3.5mm Jack (for FM Radio Antenna)
• 2x 10uF Capacitors
• 2x 100uF Capacitors
• 2x 30mm Speakers
• 1x 12mm Momentary Push Button Mode switch
• Hookup wire (for off-board connections)
• 1x Custom PCB

Software

• Kicad recommended to view the Gerber files or the general .pcb .pro .sch files
• Thonny or VSCode for programming the board.

Tools:

• Soldering Iron
• Solder

How to build/replicate

1. Gather Parts: Get everything that is on the BOM.
2. Solder the PCB: Solder all components onto your custom PCB using a soldering iron.
3. Print & Mount Case: 3D print your enclosure design, then mechanically secure and screw the potentiometers (RV1/RV2) and push button (SW1) into place.
4. Wire Peripherals: Wire your speakers to J1 and J2, and plug a cable into the 3.5mm jack (CN1) to serve as the FM antenna.
5. Flash Firmware: Install CircuitPython onto your Seeed XIAO RP2040.
6. Add Code Files: Copy the RDA5807.py library and your code.py script directly onto the board's CIRCUITPY drive.
7. Power Up & Test: Connect USB power (+5V). Pair your phone via Bluetooth to the M18 module or press the push button (SW1) to switch over to FM radio mode.
8. Enjoy: Adjust your volume knobs and enjoy your custom speaker!

Extra stuff

In Hackpad style - Hi guys

Bye guys