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Seeed XIAO BLE Sense

• Seeed Studio
• Getting started with XIAO BLE Sense on Windows
  • Arduino IDE
  • nRF52840 by Nordic Semiconductor
  • Floating-point unit (FCU)
  • Device Firmware Upgrade (DFU)
  • adafruit-nrfutil
  • Arduino IDE > File > Preferences > Settings > Additional Boards Manager URLs > https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json > OK
  • Arduino IDE > Tools > Board > Board Manager > seeed nrf52 > Seeed nRF52 Boards > 2.7.2 > Install
  • Arduino IDE > Tools > Board > Seeed nRF Boards > Seeed XIAO BLE Sense - nRF52840
  • Quit Arduino IDE
  • Arduino IDE > Tools > Port > COM* (Seeed XIAO BLE Sense - nRF52840)
• Collaborators
  • Sean Pelcher
  • Francesca Tannenbaum
  • Omar El Sayed
• Setup Arduino IDE on Raspberry Pi to support Seeed XIAO BLE Sense
• Seeed XIAO BLE Sense with Arduino IDE on Raspberry Pi OS > exec: "adafruit-nrfutil": executable file not found in $PATH > Error compiling for board Seeed XIAO nRF52840 Sense

pi@raspberrypy:~ $ pip3 install --user adafruit-nrfutil
pi@raspberrypy:~ $ adafruit-nrfutil version
adafruit-nrfutil version 0.5.3.post17

• Seeed XIAO BLE Sense with Arduino IDE on macOS > /Users/.../Library/Arduino15/packages/Seeeduino/hardware/nrf52/2.6.1/tools/adafruit-nrfutil/macos/adafruit-nrfutil: permission denied > Error compiling for board Seeed XIAO BLE Sense - nRF52840
  • The subfolder name nrf52 for versions 2.6.1 and 1.0.0 becomes mbed for version 2.7.2 with executable adafruit-nrfutil

$ cd Library/Arduino15/packages/Seeeduino/hardware/nrf52/2.6.1/tools/adafruit-nrfutil/macos/
$ chmod +x adafruit-nrfutil
$ ./adafruit-nrfutil version
adafruit-nrfutil version 0.5.3.post12

• A deep sleep example showed power consumption about 3µA
  • A fully charged 3.7 V 100 mAh lithium polymer battery may power the blink example up to 68 hours and 52 hours for the first and second times, respectively
  • Arduino IDE > File > Examples > Build-in Examples > 01.Basics > Blink
  • Keeping the battery above 50% is recommended
• 6-Axis IMU Usage on XIAO BLE Sense
  • Inertial measurement unit (IMU)
  • Seeed_Arduino_LSM6DS3 > Code > Download ZIP
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > File > Examples > Seeed Arduino LSM6DS3 > HighLevelExample > Upload
  • LSM6DS3 iNEMO inertial module: always-on 3D accelerometer and 3D gyroscope
• PDM Microphone Usage on XIAO BLE Sense
  • Pulse-code modulation (PCM)
  • Pulse-density modulation (PDM)
  • Adafruit PDM microphone breakout
  • MSM261D3526H1CPM MEMS microphone
    • Microelectromechanical systems (MEMS)
  • Seeed_Arduino_Mic > Code > Download ZIP
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > File > Examples > Seed Arduino Mic > mic_serial_plotter > Upload
  • Getting started with Wio terminal
  • Thin-film-transistor liquid-crystal display (TFT LCD)
  • Direct memory access (DMA)
  • Interrupt service routines (ISR) also known as interrupt handler
  • Wio audio spectrum display
• Speech Recognition on XIAO BLE Sense
  • Arduino_TensorFlowLite > Code > Download ZIP
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > File > Examples > Arduino_TensorFlowLite > micro_speech > Upload
• Bluetooth Usage on XIAO BLE Sense
  • ArduinoBLE > Code > Download ZIP
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > File > Examples > INCOMPATIBLE > ArduinoBLE > Peripheral > LED > Upload
  • Arduino IDE > Tools > Serial Monitor
  • When the board is powered by a battery, comment out while(!Serial); that pauses the code until the Arduino IDE serial monitor is open
  • LightBlue apps by Punch Through > Peripherals Nearby > Arduino
    • How to Use LightBlue: The Go-To BLE Development Tool
  • Web Bluetooth API
    • MDN Web Docs
  • Web Bluetooth demos
• Motion Recognition Based on Edge Impulse
  • U8g2 Monochrome Display Library > Code > Download ZIP
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > XIAO-display.ino
  • Arduino IDE > XIAO-gestures.ino
  • Edge Impulse
    • Getting started
    • Projects
    • Spectral features
  • Edge Impulse > Create new project > XIAO-BLE-gestures > Developer (20 min job limit, 4GB or 4 hours of data, limited collaboration) > Accelerometer data > Let's get started
  • Open a terminal to install the Edge Impulse CLI that requires Python 3 and Node.js, e.g., node 16.15.1 and npm 8.11.0
  • Run the Edge Impulse Data Forwarder to connect the XIAO BLE Sense
    • Frequency
    • Baud
  • Edge Impulse > Data acquisition > Record new data > Label: left-right > Sample length (ms.): 20000 > Frequency: 50Hz > Start sampling > Collected data > ⋮ > Split Sample > + Add Segment per second > Split
  • Data acquisition > Record new data > Label: idle > …
  • Data acquisition > Record new data > Label: up-down > …
  • Dashboard > Danger zone > Perform train / test split > Yes, perform the train / test split > Confirm > Dataset was rebalanced > OK
  • Impulse design > Create impulse > Time series data > Uncheck "Zero-pad data" > Add a processing block > Spectral Analysis > Add a learning block > Classification (Keras) > Save Impulse
  • Impulse design > Spectral features > Save parameters > Check "Calculate feature importance" > Generate features
  • Impulse design > NN Classifier > Check "Auto-balance dataset" > Start training
  • Model testing > Classify all
  • Deployment > Arduino library > Build > XIAO-BLE-gestures_inferencing.zip
  • Arduino IDE > Sketch > Include Library > Add .ZIP Library
  • Arduino IDE > File > Examples > XIAO-BLE-gestures_inferencing
  • Arduino IDE > XIAOEI.ino

On Windows

npm install -g edge-impulse-cli --force
edge-impulse-data-forwarder

If "edge-impulse-data-forwarder.ps1 cannot be loaded because running scripts is disabled on this system," update Windows PowerShell execution policy with the following command to allow running scripts

Set-ExecutionPolicy unrestricted

On macOS

sudo npm install -g edge-impulse-cli --force
edge-impulse-data-forwarder

If edge-impulse-data-forwarder command not found

sudo chown -R $USER /usr/local/lib/node_modules

On both Windows and macOS

Sensor reading shall be all numbers

What is your user name or e-mail address(edgeimpulse.com)?
What is your password?
To which project do you want to connect this device? Motion Recognition with XIAO BLE SENSE
3 sensor axes detected (example values: [9.6105,-15.7887,-2.7459]). What do you want to call them? Separate the names 
with ',': Ax,Ay,Az
What name do you want to give this device? XIAO BLE SENSE

To clean the configuration

edge-impulse-data-forwarder --clean

To override the frequency

edge-impulse-data-forwarder --frequency 100

To set a different baud rate

edge-impulse-data-forwarder --baud-rate 460800