LifeLink Smart Health-Safety Bracelet - ESP32-S3

LifeLink is an advanced smart health-safety bracelet prototype built on the ESP32-S3 platform, utilizing ESP-IDF alongside LVGL for a rich graphical interface (466x466 AMOLED display). It focuses on the care of the most vulnerable patients and elderly people, health tracking, and robust emergency response functionality.

Features

• Advanced Fall Detection: Utilizes the QMI8658 IMU (Accelerometer + Gyroscope) to detect sudden drops (Free Fall) and hard impacts. It requires extended stillness after an impact coupled with an orientation shift to confirm a real fall and avoid false alarms.
• Fall Simulation & Override: Users can simulate a fall via the interactive UI of the bracelet for testing purposes. Real falls trigger an immediate 5-second on-screen countdown; if it's a false alarm, users can tap to cancel before an alert is dispatched.
• Automated GSM Emergency SMS: Communicates with a SIM800L GSM Module to send background SMS alerts containing:
  • Precise GPS coordinates formatted as a direct Google Maps link.
  • Heart rate at the time of the event.
  • Contextual warnings stating whether the fall was real or simulated.
• Live Health Monitoring: Reads heart rate (BPM) and blood oxygen saturation (SpO2) using a MAX30102 sensor. Values are constantly updated on the primary watch face.
• Interactive UI (LVGL):
  • Dynamic top status bar indicating GPS lock, Cellular Network registration, Battery Levels, and BLE connectivity.
  • Intuitive gesture-based navigation (swipe left/right) between screens.
  • Dedicated "Settings" view featuring an on-screen numpad allowing users to register emergency SMS phone numbers without requiring an external mobile app.
• Sensor Debug View: Accessible "DEBUG" toggle available in the UI to visualize live X, Y, Z, and G-force readings for rapid testing and threshold calibration.

Companion Mobile App (Flutter)

A cross-platform Flutter companion app extends LifeLink's capabilities via Bluetooth Low Energy (BLE):

• Real-Time Dashboard: Live Heart Rate (BPM), SpO2, G-Force, and GPS location mirrored from the bracelet.
• BLE Connectivity: Automatic or manual pairing with the LifeLink ESP32 wearable via BLE SPP.
• Emergency Response: Configurable fall response actions — direct phone Call, SMS with GPS coordinates, or system-wide SOS intent.
• Fall Mirroring: App mirrors the bracelet's 3-stage fall detection (Safe → Warning → Alarm) with a 5-second countdown and haptic/audio alerts.
• Settings: Configure emergency contact, fall action type, countdown duration, and default device MAC address.
• Interactive Map: Displays the user's location on an OpenStreetMap view for responder assistance.

Hardware Stack

• MCU: ESP32-S3
• Display: Round AMOLED (466 x 466)
• Cellular: SIM800L GSM Module (AT Commands over UART, powered directly from 3.7V Li-Ion battery)
• IMU Sensor: QMI8658 (Accelerometer & Gyroscope)
• Health Sensor: MAX30102 (HR & SpO2)
• Power Management: AXP2101

Setup & Building

This project is built using the official Espressif ESP-IDF framework (v5.x recommended).

1. Configure the Project

idf.py set-target esp32s3
idf.py menuconfig

2. Build and Flash

idf.py build
idf.py -p COM_PORT flash monitor

Application Flow

1. Dashboard (Screen 1): Primary bracelet face, health vitals, and connectivity status icons.
2. Fall Trigger/Debug (Screen 2): Simulate a fall, or engage the raw hardware debug sensors stream.
3. Settings (Screen 3): Utilize the customized numpad to input or replace your dedicated emergency contact's GSM phone number.
4. Emergency Countdown (Screen 4): Activated upon Fall Confirmation. Provides an unmissable red-alert interface allowing users to abort the alert.