RYMCU BigSmart Development Board
RYMCU BigSmart is a smart voice interaction development board based on ESP32-S3-WROOM-1-N16R8. It integrates audio, display, camera, sensors, MicroSD storage, battery power, and other peripherals.
Key Features
- MCU: ESP32-S3-WROOM-1-N16R8 (16 MB Flash + 8 MB PSRAM)
- Audio: ES8311 DAC + ES7210 four-channel ADC + NS4150B power amplifier
- Display: 2.8" ST7789 LCD (320 x 240) + GT911 capacitive touch panel
- Camera: GC0308 (640 x 480 @ 16 FPS)
- Sensor: QMI8658 six-axis accelerometer/gyroscope
- Storage: MicroSD card slot
- Battery: 2500mAh 3.7V lithium-ion battery
- Other: WS2812B RGB LED, battery charging management, button input
Showcase
| Home | Xiaozhi |
|---|---|
 |  |
| Page 1 | Tetris |
|---|---|
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Third-party Support
RYMCU BigSmart has been merged into the following official open source projects, making it easier to build firmware and validate applications on top of their upstream ecosystems.
| Xiaozhi AI Official | Espressif Official |
|---|---|
| 78/xiaozhi-esp32 PR #1958 | espressif/esp-brookesia PR #94 |
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Open Source Hardware PCB Project
The BigSmart hardware consists of a mainboard and a microphone/button daughter board. Complete open source hardware project files are provided in the hardware folder. Import the corresponding project into LCSC EDA Professional to use it.
| Mainboard | Microphone/Button Board |
|---|---|
 |  |
Open Source Enclosure Project
The enclosure is open source and can be used directly for 3D printing.
| Top Cover | Bottom Shell |
|---|---|
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Repository Layout
BigSmart-Open/
├── hardware/
│ ├── mainboard/ # Mainboard EDA project and schematics
│ └── mics-keys/ # Microphone/button board EDA project and schematics
├── enclosure/ # Fusion 360 enclosure design files
├── docs/
│ ├── zh/ # Chinese documentation
│ └── en/ # English documentation
├── firmware/ # Prebuilt merged firmware images
├── images/ # Images referenced by documentation
├── tools/
│ └── video-converter/ # BigSmart video converter
└── README.md
Documentation
| English | 中文 |
|---|---|
| Quick Start Guide | 快速使用指南 |
| Product Brief | 产品介绍书 |
| User Manual | 用户详细使用手册 |
| Hardware Configuration | 硬件配置说明 |
| Video Converter User Guide | 视频转换器使用说明 |
Firmware
- RYMCU official firmware
- Xiaozhi AI official firmware
- Espressif official firmware
- Firmware flashing guide
The recommended image is now rymcu-V2.3.28-merged.bin. rymcu-V2.3.19-merged.bin remains available as a legacy fallback image.
Feature Showcase
Tap the Music app and Video app on the screen to play mp3 music and videos from the SD card.
| Music Playback | Video Playback |
|---|---|
 |  |
License
- Personal DIY / non-commercial use: licensed under Apache-2.0.
- Commercial use: requires commercial authorization from RYMCU. Contact RYMCU for licensing details.