The SensWear Core Mainboard is the central processing and power backbone of the SensWear modular wearable platform. It provides wireless connectivity, motion sensing, intelligent power management, and a standardized expansion interface for daughter boards, enabling rapid development of research-grade and production-ready wearable systems.

Designed as the primary controller of the SensWear ecosystem, this board handles all compute, communication, sensing coordination, and battery operations while exposing a clean and scalable I²C-based architecture for modular sensor and actuator expansion.

Core Processing & Connectivity

At the heart of the board is the nRF54L15, delivering high-efficiency wireless connectivity and embedded processing for real-time sensing and edge AI workloads. It acts as the central hub of the platform, managing communication with peripherals, coordinating data acquisition from onboard and external sensors, and enabling seamless BLE connectivity for data streaming, configuration, and firmware updates.

Integrated Motion Sensing

The board includes the BHI360 smart IMU, providing high-precision inertial sensing and onboard sensor fusion capabilities. This enables accurate motion tracking, gesture recognition, activity monitoring, and orientation estimation while offloading processing from the main MCU when needed.

Intelligent Power & Battery Management

The SensWear Core Mainboard is engineered for robust and flexible power operation:

• BQ25180 handles battery charging and power path management for safe and efficient energy delivery.
• BQ27427 provides accurate fuel gauging, enabling precise monitoring of battery level, health, and runtime estimation.
• TPSM83102 high-efficiency regulator supplies stable voltage rails for both the main system and connected daughter boards, ensuring reliable operation across varying load conditions.

Together, these components form a complete battery management and regulation subsystem optimized for low-power wearable deployments and continuous sensing applications.

Visual Feedback & Interaction

An integrated LP5562 LED driver enables advanced multi-channel LED control for visual feedback, notifications, and interaction design. This allows developers to implement expressive status indicators, biofeedback cues, or experimental interaction paradigms directly on the platform.

Modular Expansion Architecture

The mainboard serves as the central interface to all SensWear daughter boards through a standardized I²C expansion bus. It provides:

• Data communication to external sensor and actuator modules
• Regulated power distribution to expansion boards
• Scalable architecture for rapid prototyping and research experimentation

This modular approach allows developers and researchers to easily attach new sensing modalities, physiological sensors, environmental sensors, or custom hardware without redesigning the core system.

Purpose of the Mainboard

The SensWear Core Mainboard is designed to:

• Provide reliable wireless connectivity and embedded processing
• Enable high-quality motion sensing through an integrated IMU
• Manage battery charging, fuel gauging, and power regulation
• Drive visual feedback through programmable LEDs
• Act as the central hub connecting all modular daughter boards

It forms the foundation of the SensWear open, modular, and form-factor-agnostic wearable platform — enabling rapid development of next-generation wearable sensing systems for research, prototyping, and advanced real-world deployments.