This project is concerned with reverse engineering the WitMotion BWT901CL accelerometer to enable its feed to be ingested through the kdb+ TICK architecture.
This project was developed using:
WitMotion BWT901CL accelerometerLinuxkdb+/qKX Dashboards
The project was developed on Linux Ubuntu 16.04 LTS.
This software was last ran on 18/03/2021.
This package allows users to display stream information including acceleration, angular velocity and angle from the WitMotion BWT901CL accelerometer through KX Dashboards.
Follow the instructions below to display your accelerometer's data.
To download and configure kdb+/q, follow this link.
To download KX Dashboards, follow this link.
This project uses CLI commands which have been depreciated in later versions of Linux. This project assumes that these tools are installed on your local machine but it notes alternative commands that can be used when appropriate.
Run the super user command and enter your password when prompted:
sudo su
Run the system command to bring up your Bluetooth daemon service:
systemctl start bluetoothd
or
service bluetoothd start
To check bluetoothd is running, run the following:
systemctl status bluetoothd
or
service bluetoothd status
You should get a read out like:
● bluetooth.service - Bluetooth service
Loaded: loaded (/etc/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2020-11-06 21:38:45 CET; 6s ago
Docs: man:bluetoothd(8)
Main PID: 2434 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
CGroup: /system.slice/bluetooth.service
└─2434 /usr/lib/bluetooth/bluetoothd
Run the command below to bring up your registered Bluetooth adaptor:
hcitool dev up
To verify your Bluetooth adaptor is up, run this command:
hcitool dev
You should get a read out like this:
Devices:
hci0 74:DF:BF:37:DA:C0
To install this project on your local machine, follow these instructions:
- Clone this repo to your local machine:
git clone <HTTPS URL>/witmotion-bwt901cl-accelerometer-reverse-engineer.git /path/to/proj/
- Turn on your accelerometer.
To configure this application follow these steps.
In a Linux terminal run the following commands:
bluetoothctl
then in the Bluetooth controller prompt
scan on
then after a few seconds
scan off
finally, search through the printed MAC addresses for the accelerometer's, it should look something like this
[NEW] Device 20:20:08:24:49:23 HC-06
or
hcitool scan
then search through the printed MAC addresses for the accelerometer's, it should look something like this
[NEW] Device 20:20:08:24:49:23 HC-06
Note: If the accelerometer was undetected, run the above command with lescan rather than scan.
This is an optional step to verify that our MAC address is correct by running the following:
hcitool info 20:20:08:24:49:23
You should get something similar to the following:
Requesting information ...
Handle: 32 (0x0020)
LMP Version: 4.2 (0x8) LMP Subversion: 0x22bb
Manufacturer: Telink Semiconductor Co. Ltd (529)~
Features: 0x39 0x00 0x00 0x00 0x00 0x00 0x00 0x00
In the ./init.sh script change the placeholder MAC address with your accelerometer's:
rfcomm bind rfcomm0 20:20:08:24:49:23
picocom /dev/rfcomm0 -b 115200 > stream.txt
Note: The stream scripts run in the background so can be ran in the same terminal, however the kdb+ server and KX Dashboards server run in the foreground so 2 terminal tabs are required.
Follow the steps below to display your accelerometer's stream.
Run the corresponding script:
sh ./bin/init.sh &
Run the corresponding script:
sh ./bin/parse.sh &
Run the corresponding script:
q ./q/init.q
Run the corresponding script:
q dash.q -p 10001 -u 1
Note: This must be ran inside the KX Dashboards folder.
To configure your data connection and UI components, follow this video.
Note: The port used for the kdb server is 6010.
If running the following command:
hcitool dev
Results in:
Devices:
_____
Your Linux OS does not recongise any Bluetooth adaptors.
This is likely if you are running Linux non-natively, i.e. Virtual Machine, virtualisation, etc.
Install Linux natively as a dual-boot OS or seek online advice.