Intro to Bluetooth Low Energy and how to play with it using the iPhone and Node.js.

1. Bluetooth Low-Energy
Intro and demo using the iPhone and Node.js
Mirko Kiefer
@mirkokiefer
mirkokiefer.com

2. Bluetooth data rates
• Bluetooth 1.2: 0.72 Mbit/s
• Bluetooth 2.0: 2.1 Mbit/s
• Bluetooth 3.0: 24 Mbit/s
• Bluetooth LE: 0.27 Mbit/s

4. Design Goals
• Lowest possible energy usage
• Short range (up to 50 m)
• Client-Server
• Connectionless / Statelessness
• Discoverability

5. Applications
• Home automation
(open door with phone)
• Medical measurement devices
(heart rate sensor, blood pressure, …)
• Mobile payment
• Indoor navigation
• …

6. Roles
• Central:
- Discover and connect to devices
- Interact with services
• Peripheral:
- Be discoverable
- Expose Services

7. Services
• Exposed by Peripherals
e.g. a weather service
• Contain Characteristics
attributes including meta data
e.g. temperature, humidity

8. Demo time
• Peripheral: iPhone
- Publishes “attitude service” using gyrometer
• Central: Node.js on Macbook
- Subscribes to attitude service
- Streams attitude into browser (Websockets)
- Browser renders 3-d wireframe of iPhone attitude
• Code on github:
https://github.com/mirkokiefer/bluetooth-low-energy-
demo