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ME266SeniorProject

Environment Setup

Install the necessary Python packages
pip install bleak scipy pyserial

Arduino - Bluetooth Data Transmission

See the .ino file in repirOS_Arduino_BLE directory

  1. Assign UUID values to BLE_UUID_FLOW_CHAR_A and BLE_UUID_FLOW_CHAR_B (already DONE in the script) (e.g. #define BLE_UUID_FLOW_CHAR_A "00002a19-0000-1000-8000-00805f9b34fb" // mouth)
  2. Upload the code to the Arduino Nano 33 BLE device.

This Arduino script incorporates a native Low-Pass Filter for noise filtering. If you want to see the raw data and/or modify the filter implementation, the Arduino script needs to be modified to transmit raw data without signal attenuation due to the filter. See the comments in the file in this directory for instructions.

Python - Bluetooth Data Acquisition

We provide two complementary scripts to configure your Mac or Windows laptop to acquire data from the Arduino Nano 33 BLE over Bluetooth. The scanner.py steps below need to be executed only once. Once the device address is acquired, as described below, every subsequent connection only requires the connect.py steps. If the Arduino is ever replaced, then scanner.py must be re-executed to acquire the address of the new device.

In scanner.py

  1. Use scanner.py to obtain the Device Address (e.g. 17CAE466-EE0D-6B2D-67D6-3271350BA08A: FlowService )
  • NOTE * Windows have different Device Address.

In connect.py

  1. Copy and paste the Device Address from the previous step to the "address" variable.
  2. Confirm that the UUID values are matching from those in Arduino (see above).
  3. Run the script connect.py. The csv file is saved after 30 seconds.

Serial Data Acquisition

We provide the serial_connect.py script for debugging purposes. This script uses a direct USB connection between the Arduino and the connected computer device for data transmission instead of Bluetooth. This generally allows for a faster data transmission rate (allowing for higher frames per second for the visualization). To use this script in place of the Bluetooth version described above:

  1. Connect the Arduino Nano 33 BLE to a laptop with a USB cable
  2. Determine the COM port the Arduino is connected to. If using Windows, this can be determined from the Device Manager. See https://www.mathworks.com/help/supportpkg/arduinoio/ug/find-arduino-port-on-windows-mac-and-linux.html.
  3. Set the COM port determined above in line 11 of serial_connect.py
  4. Run serial_connect.py for real-time visualization
  5. Disconnect the Arduino from USB power to save the logged data as a csv

An alternate Arduino script must be used to send data over Serial instead of Bluetooth. We provide a version of this in the arduino_serial_interface directory. This script incorporates a native Low-Pass Filter for noise filtering. If you want to see the raw data and/or modify the filter implementation, the Arduino script needs to be modified to transmit raw data without signal attenuation due to the filter. See the comments in the file in this directory for instructions.