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SiSeriesRadio

Open-Source Si4732 / Si4735 Radio Receiver with Raspberry Pi Pico Front End

This project documents the design and development of a modular Si4732 / Si4735–based radio receiver, controlled by a Raspberry Pi Pico and implemented on a custom, fully open-source PCB platform.

SiRadioSeriesBoard

Open-Source Si4732 / Si4735 Radio Platform with Raspberry Pi Pico Front End

Overview

SiRadioSeriesBoard is a fully open-source hardware radio receiver platform based on the Silicon Labs Si4732 and Si4735 radio receiver ICs. Version 2.0 builds upon the original breakout-board design and introduces a dedicated Raspberry Pi Pico–based front-end user interface, replacing earlier ESP32-based implementations.

The hardware is intentionally split into three independent boards, allowing:

• Easier assembly and debugging
• Simple replacement or upgrade of radio cards
• Future expansion without redesigning the entire system

This architecture makes the project ideal for radio experimentation, DIY receivers, educational use, and embedded radio research.

Key Features

• Si4732 / Si4735 Radio Receiver

  • AM, FM, and SW reception (chip-dependent)

• Raspberry Pi Pico Front End

  • Reliable and flexible MCU control

• Dedicated Power Supply Section

  • Clean and stable power delivery

• Dual 0.96-inch OLED Displays

  • Simultaneous information display

• SPI Display Header

  • Optional external display support

• 5 Tactile Input Switches

• Rotary Encoder

  • Smooth tuning and menu navigation

• Modular 3-Board Architecture

• 3.5 mm Audio Output Jack

• On-board I²S Expansion Headers

• Fully Open-Source Hardware

Board Architecture

The project consists of three separate PCB boards:

1. Radio Card (Si4732 / Si4735 Board)

• Hosts the Si4732 or Si4735 radio IC
• Includes all required RF passives and filtering components
• Designed as a plug-in radio module
• Pinout optimized for Raspberry Pi Pico control

2. Front-End UI Board (Raspberry Pi Pico)

• Raspberry Pi Pico microcontroller
• Dual 0.96-inch OLED displays
• 5 input buttons
• Rotary encoder interface
• SPI display expansion header
• Handles all user interaction and display logic

3. Interconnect / Power Board

• Centralized power distribution
• Electrical interconnection between Radio Card and UI Board
• Optional voltage regulation
• External power input interface

Hardware Design Files

The repository includes complete design files for all boards:

RadioCard/
 ├─ Schematics
 ├─ PCB Layout

FrontEndUIBoard/
 ├─ Schematics
 ├─ PCB Layout

InterconnectPowerBoard/
 ├─ Schematics
 ├─ PCB Layout

GerberFiles/
 ├─ Manufacturing outputs

BOM/
 ├─ Bill of Materials

Designs are provided in standard EDA formats (KiCad / EasyEDA, depending on board revision).

Software Status

🚧 Software is currently under development

Planned Raspberry Pi Pico firmware features include:

• I²C communication with Si4732 / Si4735
• Button and rotary encoder handling
• OLED display control
• Band switching, scanning, and presets
• Future support for I²S digital audio

Software will be published in this repository or linked as a companion project once stable.

Getting Started

1. Review schematics and PCB layouts
2. Check the Bill of Materials (BOM)
3. Generate and order PCBs using the Gerber files
4. Source components
5. Assemble the three boards
6. Interconnect the boards
7. Flash firmware to the Raspberry Pi Pico (when available)

Contributing

Contributions are welcome and encouraged.

• Fork the repository
• Create a feature or fix branch
• Submit a pull request
• Open issues for bugs or enhancement ideas

License

Attribution Required License

You are free to:

• Use
• Modify
• Manufacture
• Distribute

⚠️ Attribution to the original author (ecmastermind) is mandatory in any derivative work.

See the LICENSE file for full terms.

Acknowledgements

Thanks to:

• The open-source radio community
• Silicon Labs documentation
• Contributors and testers

Links & Contact (Verified)

• GitHub Repository https://github.com/SREERAJSVT/SiSeriesRadio

• OSHWLab Project Page https://oshwlab.com/appusrtv2016/si473x

• Website https://ecmastermind.com

• Email team@ecmastermind.com

SiRadioSeriesBoard by ecmastermind Fully Open-Source Hardware — Attribution Required