DIY Smart AI Watch for 80 Yuan: 100% Open Source, Based on ESP32 with 1.8-Inch LED Screen, Built-in Pedometer, Compass, and Barometer

Contact the editor at the end of the article to obtain the project source code.

The Monica smart watch is based on the Espressif EPS32-S3 development board, equipped with a1.8-inch LED display, developed using the Mooncake UI framework, and includes a built-in pedometer, compass, and barometric sensor.

• Microcontroller: ESP32-S3, 32M external Flash

• IMU: BMI270 + BM150 (wrist raise wake-up, pedometer, compass)

• Power Management: AXP2101

• Others: SD card slot, RTC, buzzer, MIC, barometric sensor, buttons

• Screen: 1.8-inch AMOLED 368*448

• Battery: 402728 400mAh

The Mooncake UI framework decouples the application and driver layers:

SimpleKV: A simple Key-Value memory database framework that implements two-layer data interaction. It uses keys to index data, breaking the data coupling between the application layer and the driver layer.

Lvgl: Uses Lvgl as the default graphics library for upper-layer applications and its file system interface.

Driver Layer

• HAL: Object abstraction for peripheral drivers

• Hardware Manager: Responsible for low-level hardware initialization and runtime state maintenance updates, such as automatic sleep, wrist raise wake-up, and pedometer updates.

• USB MSC Mode: To facilitate reading and writing to the SD card, when the power and down buttons are pressed during startup, it enters USB MSC mode, and the SD card is mounted as a U disk, allowing direct read and write when connected via USB.

Application Layer

• App Base Class, Installation and Uninstallation Framework: The base class for all App objects, describing the basic framework of the App. The installation and uninstallation framework implements simple App list management.

• App Lifecycle Management: Supports the scheduling of the App running lifecycle in the foreground and background (single-threaded, single foreground, multiple backgrounds), implemented using a finite state machine (FSM).

• Built-in System Apps: All applications implemented above the App layer, but the startup animation and launcher are specially called by the Framework.

User-defined Watch Faces

Each folder under the watch_faces directory is treated as a watch face.

• background directory: Stores watch face background resources (png, gif)

• number directory: Stores time digit resources from 0 to 9 (png)

• face.json: Resource description file, such as time digit coordinates, etc.

watch_faces/|├── AyanamiRei│   ├── background│   │   ├── background.png│   ├── face.json│   └── number│       ├── 0.png│       ├── ~│       └── 9.png|├── FloatingNum│   ├── background│   │   └── background.png│   ├── face.json│   └── number│       ├── 0.png│       ├── ~│       └── 9.png|└── PixelThinking  ├── background  │   ├── background.png  ├── face.json  └── number      ├── 0.png      ├── ~      └── 9.png

3D Shell Model

Schematic DiagramPCB Board

If you have needs for IoT source code procurement and project delivery, please scan the code to contact the editor, WeChat ID: beacon0418

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