🚀 Integrating Bluetooth Low Energy (BLE) Heart Rate Monitoring in Flutter App

Overview

In this project, we explore integrating a BLE-compatible heart rate monitor with a Flutter app, enabling real-time health data display.

Memory updated

🚀 Integrating Bluetooth Low Energy (BLE) Heart Rate Monitoring in Flutter Apps

Overview

In this project, we explore integrating a BLE-compatible heart rate monitor with a Flutter app, enabling real-time health data display.

Key Features

1. Real-Time Heart Rate Tracking

• The app connects to a BLE heart rate monitor and displays the heart rate in real-time on the user interface.
• BLE ensures efficient, low-latency data transfer, suitable for live updates.

2 . Battery Level Monitoring

• Using BLE services, the app retrieves and displays the device’s battery status.

3 . Seamless Bluetooth Connectivity

• Built with the flutter_blue package, providing a robust solution for BLE communication.

Tech Stack

• Flutter: For cross-platform app development.
• BLE: For connecting and interacting with smart devices.
• flutter_blue: A Flutter plugin for BLE communication.

Step-by-Step Implementation

1️⃣ Project Setup

Add the flutter_blue package to your project:

dependencies:
  flutter_blue: ^x.x.x

import the package:

import 'package:flutter_blue/flutter_blue.dart';

2️⃣ Scanning for Devices

⚫️ Initialize a BLE scan:

FlutterBlue.instance.startScan(timeout: Duration(seconds: 5));

⚫️ List available devices:

FlutterBlue.instance.scanResults.listen((results) {
  for (ScanResult r in results) {
    print('${r.device.name} found! RSSI: ${r.rssi}');
  }
});

⚫️ Discover services:

List<BluetoothService> services = await device.discoverServices();

4️⃣ Reading Heart Rate ♥️

⚫️ Locate the heart rate characteristic:

BluetoothCharacteristic heartRateCharacteristic = services
    .firstWhere((s) => s.uuid == HEART_RATE_SERVICE_UUID)
    .characteristics
    .firstWhere((c) => c.uuid == HEART_RATE_CHARACTERISTIC_UUID);

⚫️ Enable notifications for real-time data:

heartRateCharacteristic.setNotifyValue(true);
heartRateCharacteristic.value.listen((value) {
  int heartRate = value[1]; // Parse heart rate data
  print('Heart Rate: $heartRate bpm');
});

5️⃣ Fetching Battery Level 🔋

⚫️ Locate and read the battery characteristic:

BluetoothCharacteristic batteryCharacteristic = services
    .firstWhere((s) => s.uuid == BATTERY_SERVICE_UUID)
    .characteristics
    .firstWhere((c) => c.uuid == BATTERY_CHARACTERISTIC_UUID);

List<int> batteryData = await batteryCharacteristic.read();
print('Battery Level: ${batteryData[0]}%');

6️⃣ Building the UI

Use Flutter widgets to create a clean interface displaying heart rate and battery level:

Text('Heart Rate: $heartRate bpm'),
Text('Battery: $batteryLevel%'),

Challenges

• Handling device compatibility: Ensure the BLE device supports the necessary GATT profiles.
• Real-time updates: Optimize for efficient UI rendering during frequent data updates.

Conclusion

This project showcases how Flutter and BLE can create seamless, responsive apps for smart device integration. Whether you’re a developer diving into IoT or building the next big health app, BLE is a game-changer for mobile connectivity.

Stay tuned for the full source code and more on this topic in my Medium post! 💡

🔗 Check out the demo or learn more: 👉 https://www.linkedin.com/posts/mohammed-shamseer-pv_flutter-bluetooth-healthtech-activity-7266155475254091776-WHXY?utm_source=share&utm_medium=member_android