BLE Heart Rate Monitor
Dragos Stahie
This is a Jetpack Compose-based Android application that connects to Bluetooth Low Energy (BLE) heart rate monitors and visualizes heart rate data in real time. Designed with a focus on clean architecture, the app combines performance and simplicity to provide users with actionable insights for fitness and health tracking.
🌟 Current Features
1. Device Discovery
Scans for BLE devices with the Heart Rate Service.
Displays a bottom sheet for users to select a device to connect to.
2. Heart Rate Visualization
Real-time BPM reading from the connected heart rate monitor.
A color-coded graph representing heart rate zones for better tracking.
3. Efficient BLE Data Handling
Reads and subscribes to BLE heart rate characteristic changes.
Parses characteristic bytes to extract heart rate data.
🚀 Planned Features
Session Recording
Record heart rate sessions for later review.
Visualize session data with trends and insights.
Additional Sensor Support
Connect and visualize data from cadence, speed, and power sensors for cycling.
Advanced Metrics
Display Heart Rate Variability (HRV) and respiration rate for compatible devices.
UI Improvements
Enhanced graph animations and a more customizable user experience.
🛠️ Technical Overview
This app is built using a simple version of clean architecture and Jetpack Compose, with a focus on maintainability and scalability.
Key Components:
BLE Scanning and Connection:
Uses the Bluetooth Low Energy API to discover devices advertising the Heart Rate Service.
Creates a stable connection and subscribes to real-time data updates.
Heart Rate Data Parsing:
Parses the heart rate measurement characteristic’s byte data to extract accurate BPM values.
UI:
Fully implemented in Jetpack Compose for a modern and dynamic UI experience.
Includes a real-time graph with heart rate zones color-coded for easy interpretation.
📚 Tech Stack
Language: Kotlin
Architecture: Clean Architecture (simplified version)
UI: Jetpack Compose
BLE API: Android BLE Library
Other Tools: Coroutines, SharedFlow, StateFlow
💡 Future Goals
This app aims to provide athletes and fitness enthusiasts with advanced BLE-based tracking tools. The planned features will make it a comprehensive platform for monitoring multiple metrics like heart rate, cadence, and power, all while delivering an intuitive user experience.
🚧 Development Progress
✅ Scanning and connecting to BLE devices with Heart Rate Service
✅ Parsing heart rate measurement characteristic data
✅ Visualizing BPM and heart rate zones in real-time
🔜 Session recording and review
🔜 Support for HRV, respiration rate, and other sensors
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Posted Dec 19, 2024
An advanced Android app designed for seamless connection and visualization of real-time heart rate data from BLE (Bluetooth Low Energy) devices.
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