Building a BT 4.0 LE HID device
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Building a BT 4.0 LE HID device, a talk at London Bluetooth Hardware Developers http://meetup.com/London-Bluetooth-Hardware-Developers/
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Building a BT 4.0 LE HID device
- 1. London Bluetooth Hardware Developers Sponsored by Venue #LBTHD .IDEAL
- 2. “Apple iBeacon Technology Overview” Vladimir Petrov @VladPetroff 🍕🍩🍻💬 🍕🍩🍻💬 🍕🍩🍻💬 “Deploying beacons in a retail environment” Tim Woolford @tim_woolford “Introduction to Avnet and Bluegiga BLE121LR” Alastair Worth @wirelessworthy 🍻 Blueberry Bar, across the road #LBTHD “Building a BT 4.0 LE HID device” Nick Brook @nrbrook .IDEAL
- 3. #LBTHD .IDEAL “Building a BT 4.0 LE HID device” Nick Brook @nrbrook
- 4. #LBTHD • Bluetooth foot pedal • Supports up to 4 pedals • Used primarily with music display Apps, turning pages .IDEAL AirTurn BT-105
- 5. #LBTHD • Bluetooth 2.1 • HID device — Bluetooth keyboard • iOS • Doesn’t provide access to key events (directly, <7) • Hides the virtual keyboard • Requires hacks .IDEAL AirTurn BT-105
- 6. #LBTHD • Provides direct access to Bluetooth 4 LE devices • Introduced iOS 5 • Good device support .IDEAL CoreBluetooth
- 7. #LBTHD • AKA “Bluetooth Smart” • Entirely new protocol stack (vs Bluetooth “Classic”) • Peripheral (Server) advertises services • Central (Client) scans and connects to devices .IDEAL Bluetooth 4 LE
- 9. #LBTHD • 31 byte advertising packet + scan response • GATT Database • Services • Characteristics (key -> value store) • Up to 512 bytes • Read, write, notify .IDEAL Bluetooth 4 LE
- 10. #LBTHD • Some services defined by Bluetooth SIG, e.g. • Human Interface Device • Device Information • Battery • You can define your own services .IDEAL Bluetooth 4 LE
- 11. #LBTHD • Simple • Quick to learn • Can achieve a lot • Some oddities .IDEAL Bluetooth 4 LE BLUETOOTH SPECIFICATION Version 4.0 [Vol 3] page 485 of 656 Attribute Protocol (ATT) Unlikely Error 0x0E The attribute request that was requested has encountered an error that was unlikely, and therefore could not be completed as requested. Insufficient Encryption 0x0F The attribute requires encryption before it can be read or written. Unsupported Group Type 0x10 The attribute type is not a supported Name Error Code Description
- 12. #LBTHD • Small • Low cost (£8) • Low power (CR2032) • Complete integrated package (radio, antenna, microcontroller, flash, GPIO, UART, I2C, PWM, ADC) • Easy, simple, quick to get started • BGScript .IDEAL Bluegiga BLE113
- 13. #LBTHD • Don’t need much circuitry around the package • Power supply • Any sensors/IO .IDEAL Bluegiga BLE113
- 16. #LBTHD • Custom GATT service • Provides pedal state change notifications • Also supports HID for keyboard / mouse commands .IDEAL New AirTurn
- 17. #LBTHD • Scans for / connects to devices • UI provided • Sends out notifications on pedal events • Works in background • Different AirTurns connected to different Apps • Simple to implement • No Hacks!! .IDEAL New framework
- 18. #LBTHD • Growing number of freelance projects • Get in touch • @nrbrook • nick@nickbrook.me • Speak to me! • Please give feedback! http://goo.gl/HgSrgu .IDEAL LE + mobile projects