SmartWatchProject

SmartWatch Project

Overview

This repository hosts the source code and technical documentation for the SmartWatch project, developed as part of an embedded systems course. The prototype is a wearable device designed for health monitoring, motion tracking, and real-time data visualization, while seamlessly communicating with a smartphone via Bluetooth Low Energy (BLE).

Key Features

• Health Monitoring: Measures heart rate and blood oxygen saturation (SpO₂) using the MAX30102 sensor.
• Motion Tracking: Detects 3D acceleration and orientation with the MPU-6500 sensor.
• Environmental Sensing: Captures temperature, humidity, and atmospheric pressure using the BMP280 sensor.
• GPS Navigation: Provides accurate location tracking with the NEO-7M module.
• User Interface: Displays real-time data on a high-performance ST7789 TFT screen and allows navigation via dedicated buttons.
• Wireless Communication: Transmits sensor data using the AT-09 Bluetooth module.
• Efficient Power Management: Powered by a rechargeable LiPo battery (USB-C charging) with voltage regulation via LM317.

Repository Structure

smartwatch/
├── hardware/         # Schematics, PCB design files, and hardware documentation
├── Code/         # Source code, drivers, and firmware modules
├── docs/             # Detailed technical documentation, testing procedures, cost calculations, etc.
├── Ressources/         # GIF used for screen animation

└── README.md         # This file

Hardware Overview

The design centers around the STM32L476RCT6 microcontroller, ensuring low power consumption and high performance. The main hardware components include:

• MCU: STM32L476RCT6 (ARM Cortex-M4, 80 MHz, low-power design)
• Bluetooth Module: AT-09 (based on TI CC2541) for BLE connectivity
• Sensors:
  • MPU-6500: IMU for acceleration and gyroscopic data
  • MAX30102: For heart rate and SpO₂ measurements
  • BMP280: For temperature, humidity, and pressure readings
• Display: ST7789 TFT screen for real-time information display
• GPS Module: NEO-7M for precise location tracking
• Power Management: Voltage regulators (LM317) and a power switch optimize energy efficiency

Software Architecture

The firmware is organized into modular APIs that manage:

• LED Indicators: Status and error signals.
• Bluetooth Communication: Data exchange over BLE.
• User Input: Button handling for reset and display navigation.
• Sensor Data Acquisition: Interfaces for reading data via I2C and SPI.

Upon startup, the system performs a handshake with each module. Once all components are verified, the main loop continuously:

• Acquires sensor data on a periodic basis.
• Refreshes the TFT display.
• Monitors user inputs.
• Transmits sensor data via Bluetooth every second.
• Continuously updates GPS data.

Testing Procedures

Testing covers multiple aspects of the system to ensure reliability:

• Visual & Hardware Inspection: Check for soldering issues, short circuits, and proper PCB assembly.
• Power Supply Testing: Verify voltage levels and current draw under various loads.
• Sensor Validation: Calibrate and compare readings for health, motion, and environmental sensors.
• Communication Tests: Ensure robust Bluetooth pairing and accurate GPS data reception.
• System Integration: Confirm end-to-end functionality, including data flow from sensors to display and wireless transmission.

Getting Started

1. Clone the Repository:

   git clone https://github.com/exysta/SmartWatchProject.git
   cd SmartWatchProject

2. Build the Firmware:
   • Open the project in STM32CubeIDE or your preferred environment.
   • Compile the project
3. Flash the Firmware:
   • Use an ST-LINK/V2 programmer to flash the firmware onto the STM32 MCU.

Acknowledgments

• Project Team: Mathéo Morin, Lucas Chapart, Mayane Guillon
• Supervisor: Marko Kauppinen
• Course: Embedded Systems Project