Hardware, BOM, and Enclosure

Visual Asset Set

Image	Intended use
body-tracker-hero.png	Homepage overview and project landing page.
body-tracker-product-shot.png	Public hardware photo for the tracker body.
body-tracker-board-top.png	Close-up top view of the wearable board and mounting.
body-tracker-imu-preview.png	3D preview of the IMU module and enclosure fit.
body-tracker-imu-render.png	IMU board rendering and enclosure discussion.
body-tracker-imu-schematic.png	Sensor circuit and axis-reference explanation.
body-tracker-esp32-photo.jpg	ESP32-C3 transport board photo.
body-tracker-esp32-pcb.png	PCB layout and component placement.
body-tracker-esp32-schematic.png	Power and transport-board schematic.
body-tracker-esp32-overview.png	Full board function overview.

Included Design Assets

Asset	Location	License
ESP32-C3 transport board	HARDWARE/esp32c3信息传输板.epro2	CERN-OHL-S-2.0
ICM-20948 test board	HARDWARE/ICM-20948测试板.epro2	CERN-OHL-S-2.0
Battery enclosure	3D打印文件/batteryBoxNew-Body001.step	CC BY-SA 4.0
Connector enclosure	3D打印文件/connter-Body.step	CC BY-SA 4.0
Public bill of materials	BOM/body-tracker-bom.csv	Repository default, verify suppliers yourself
BOM notes	BOM/README.md	Repository default
Historical sourcing sheet	BOM/淘宝imu+esp32关键元件采购表.xlsx	Source reference only

The public website should prefer the image set above for layout and explanation. Use the photo assets for product identity, and keep the schematic/PCB assets for board-level explanation.

Visual Gallery

The EPRO2 files are for Lichuang EDA. Review every schematic, footprint, net class, battery-polarity marking, and manufacturing rule before ordering.

The normalized BOM describes two configurations: a four-node minimum tracker (chest, upper_arm, forearm, palm) and the current five-node standard tracker with finger. Supplier links are references and must be checked before ordering.

Current Board Connections

GPIO	Function
IO5	Battery-voltage ADC; the measured value is scaled by two in the board design.
IO6 / IO7	I2C SDA / SCL for the IMU.
IO1	ICM-20948 data-ready interrupt.
IO2	Button voltage input.
IO10	System-enable latch.

The ICM-20948 test-board silkscreen has a known X/Y labeling issue. Use the sensor datasheet and a physical check, not the silkscreen alone, when defining sensor axes.

Before Powering a Board

1. Inspect battery polarity and charging/protection circuitry.

2. Verify I2C continuity and pull-up voltage before inserting the sensor.

3. Confirm that the board target is ESP32-C3 and that flash size matches partitions.csv.

4. Start with USB power and serial logs before battery-only operation.

5. Do not use unverified hardware on a person or near a moving robot.