WiT BWT61CL User manual

BWT61CL | manual V22-0412 | www.wit-motion.com
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USER MANUAL BWT61CL
Bluetooth 2.0 Inclinometer Sensor

BWT61CL | manual V22-0412 | www.wit-motion.com
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Tutorial Link
Google Drive
Link to instructions DEMO:
WITMOTION Youtube Channel
BWT61CL Playlist
If you have technical problems or cannot find the information that you need in the
provided documents, please contact our support team. Our engineering team is
committed to providing the required support necessary to ensure that you are
successful with the operation of our AHRS sensors.
Contact
Technical Support Contact Info
Application
●AGV Truck
●Platform Stability
● Auto Safety System
●3D Virtual Reality
●Industrial Control
●Robot
●Car Navigation
●UAV
●Truck-mounted Satellite Antenna Equipment

BWT61CL | manual V22-0412 | www.wit-motion.com
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Contents
Tutorial Link ............................................................................. - 2 -
Contact ................................................................................... - 2 -
Application............................................................................... - 2 -
Contents.................................................................................. - 3 -
1 Introduction .......................................................................... - 5 -
1.1 Warning Statement ......................................................... - 6 -
1.2 LED Status..................................................................... - 6 -
2 Use Instructions with PC.......................................................... - 7 -
2.1 PC Connection ................................................................ - 7 -
2.1.1 Serial Connection ................................................... - 7 -
2.1.2 USB-HID connection ..............................................- 10 -
2.1.3 PC’s Bluetooth Connection ......................................- 14 -
2.2 Software Introduction.....................................................- 15 -
2.2.1 Main Menu ..........................................................- 15 -
2.2.2 Menu of Configuration ............................................- 17 -
2.3 Calibration ....................................................................- 19 -
2.3.1 Accelerometer Calibration .......................................- 19 -
2.3.2 Reset Z-axis Angle .................................................- 20 -
2.4 Configuration ................................................................- 22 -
2.4.1 Set Baud Rate .......................................................- 22 -
2.4.2 Data Recording......................................................- 22 -
2.4.3 Data Playback .......................................................- 24 -
2.4.4 Standby and Wake Up ............................................- 26 -
2.4.5 Placement Direction ...............................................- 26 -
2.4.6 Static Threshold ....................................................- 28 -
2.4.7 Bandwidth ............................................................- 29 -

BWT61CL | manual V22-0412 | www.wit-motion.com
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3 Use Instructions with Android Phone ........................................- 31 -
3.1 APP Installation .............................................................- 31 -
3.2 Connection ...................................................................- 32 -
3.2.1 APP Pairing ...........................................................- 32 -
3.2.2 Phone’s Bluetooth Pairing........................................- 34 -
3.3 Calibration ....................................................................- 36 -
3.3.1 Acceleration Calibration ..........................................- 36 -
3.3.2 Reset Z-axis Angle .................................................- 37 -
4 Multiple Connection ...............................................................- 38 -
4.1 Download Link...............................................................- 38 -
4.2 Connection Instructions ..................................................- 38 -

BWT61CL | manual V22-0412 | www.wit-motion.com
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1Introduction
The BWT61CL is a multi-sensor device detecting acceleration, angular
velocity and angle . The robust housing and the small outline makes it
perfectly suitable for industrial retrofit applications such as condition
monitoring and predictive maintenance. Configuring the device enables the
customer to address a broad variety of use cases by interpreting the sensor
data by smart algorithms.
BWT61CL’s scientific name is AHRS IMU sensor. A sensor measures 3-axis
angle, angular velocity, acceleration. Its strength lies in the algorithm which
can calculate three-axis angle accurately.
BWT61CL is an CE standard accelerometer. It is employed where the highest
measurement accuracy is required. BWT61CL offers several advantages over
competing sensor:
•Heated for best data availability: new WITMOTION patented zero-bias
automatic detection calibration algorithm outperforms traditional
accelerometer sensor
•High precision Roll Pitch Yaw (X Y Z-axis) Acceleration + Angular Velocity +
Angle
•Low cost of ownership: remote diagnostics and lifetime technical support by
WITMOTION service team
•Developed tutorial: providing manual, datasheet, Demo video, free software
for Windows computer, APP for Android smartphones
•WITMOTION sensors have been praised by thousands of engineers as a
recommended attitude measurement solution

BWT61CL | manual V22-0412 | www.wit-motion.com
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1.1 Warning Statement
Putting more than 5 Volt across the sensor wiring of
the main power supply can lead to permanent damage
to the sensor.
For proper instrument grounding: use WITMOTION
with its original factory-made cable or accessories.
Do not access the I2C interface.
Do not change the baud rate because
WITMOTION BLUETOOTH sensor’s baud rate is
fixed.
1.2 LED Status
LED
Status
Remark
Red
Flashing
Charging
Blue
Flashing
Pairing process
Keeping still
Successful pairing

BWT61CL | manual V22-0412 | www.wit-motion.com
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2Use Instructions with PC
2.1 PC Connection
PC software is only compatible with Windows system.
BWT61CL Playlist
2.1.1 Serial Connection
Step 1. Connect the sensor with offered Type-C wire.
(Warm Reminder:If you wanna use a longer cable,it should be a standard
Type-C data cable)
Step 2. Unzip the software and install the driver CH340
https://drive.google.com/file/d/1I3hl9Thsj9aXfG6U-cQLpV9hC3bVEH2V/view
?usp=sharing
*How to Install and update the CH340 driver
Click the "Uninstall" button first. Then click on the "Install" button.

BWT61CL | manual V22-0412 | www.wit-motion.com
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*How to verify your driver is working
1）To check that the CH340 enumerates to a COM port, you can open the device
manager. You can click the Start or ⊞(Windows) button and type "device
manager to quickly search for the application.
2）After opening the device manager, you will need to open the Ports (COM &
LPT) tree. The CH340 should show up as USB-SERIAL CH340 (COM##).
Depending on your computer, the COM port may show up as a different number.

BWT61CL | manual V22-0412 | www.wit-motion.com
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Step 4. Open the software(Minimu.exe)
Data will appear after auto-search finishes
Notice: If not successful, please operate manually
Choose the com port and baud rate 115200, data will be shown on the software.

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.1.2 USB-HID connection
Step 1. Open the software, Minimu.exe
Step 2. Insert the USB-HID adapter into the USB slot of the computer（the blue
light of HID adapter flashes）

BWT61CL | manual V22-0412 | www.wit-motion.com
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Step 3. Install the driver CH340 and confirm the “com port” in device manager
https://drive.google.com/file/d/1I3hl9Thsj9aXfG6U-cQLpV9hC3bVEH2V/view
?usp=sharing
*How to Install and update the CH340 driver
Please kindly refer to Chapter 2.1.1 Serial Connection, content of
installing or updating CH340 driver
Step 3. Turn on the sensor and the blue light of the sensor flashes
Step 4. Close the pop-up window

BWT61CL | manual V22-0412 | www.wit-motion.com
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Step 5. the software will be set up unbinding automatically and search devices
successfully (Bluetooth Pairing process)
Step 6. Set successfully, click "ok"

BWT61CL | manual V22-0412 | www.wit-motion.com
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Step 7. Wait till the sensor's blue LED light remains on--means pairing
succeeded
Step 8. Data will appear once the auto-search finishes

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.1.3 PC’s Bluetooth Connection
Step 1. Turn on computer's Bluetooth
Step 2. Turn on the sensor
Step 3. Search HC-06 device and input pairing password, 1234
Step 4. Confirm the outgoing com port on “More Bluetooth Options” page
Step 5. Open software (Minimu.exe) and choose the correct com port
Step 6. Data will appear once the automatic search finishes

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.2 Software Introduction
Link to download software
2.2.1 Main Menu
Main Menu of software
Button
Function
File
Launch recorded HEX file (Bin format)
Tools
Hide or display tools box on left side
Record
Record function
3D
3D Unity DEMO
Config
Configuration setting
Help
Language
Switch to English or Chinese
Bluetooth Set
Option for binding device or unbind
Firmware update
Option for firmware update
About Minimu
Info about Minimu.exe
Factory test
For manufacturer internal test only
Auto-search
Auto searching the sensor
Port
Com port selection
Baud
Baud rate selection
Type
Fixed setting as JY61 for BWT61CL

BWT61CL | manual V22-0412 | www.wit-motion.com
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Open
Open com port
Close
Close com port
Acc Calibrate
Acceleration calibration

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.2.2 Menu of Configuration
Menu of Configuration
Button
Function
Reset Z-axis Angle
Reset Z-axis angle to 0 degree
Acceleration Calibration
Ability to proceed accelerometer calibration
Sleep
Sleep function, not available for Bluetooth
sensor series
Baudrate
115200(100Hz) (Fixed)/ 9600(20Hz)
Mode
Serial / IIC(only for modules)
Direction
Vertical or horizontal installation
Static threshold
Static threshold for angular velocity
Bandwidth
Option for bandwidth range

BWT61CL | manual V22-0412 | www.wit-motion.com
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Menu of Data
Button
Function
Time
Real time
Acceleration
Data for Acceleration
Angular Velocity
Data for Angular Velocity
Angle
Data for Angle

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.3 Calibration
Preparation:
Make sure the sensor is “Online”.
Calibration on PC software：
It is required to calibrate for the first time usage.
2.3.1 Accelerometer Calibration
Purpose:
The accelerometer calibration is used to remove the zero bias of the
accelerometer. Before calibration, there will be different degrees of bias error.
After calibration, the measurement will be accurate.
Methods:
1. Firstly keep the module horizontally stationary, then click “Acceleration
Calibration”in the “Config” of the software.
2. After 1 ~ 2 seconds, the three axial acceleration value of the module is
about 0, 0，1, the X and Y axis Angle is around 0 °. After calibration, the x-y
axis Angle is accurate.
Note: when putting the module horizontal, there is one G of gravitational
acceleration on the Z-axis.

BWT61CL | manual V22-0412 | www.wit-motion.com
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2.3.2 Reset Z-axis Angle
Z-axis to 0 is to make the initial angle of the Z-axis angle is relative 0 degree.
When the module is used before and Z-axis drift is large, the Z-axis can be
calibrated, When the module is powered on, the Z-axis will automatically return
to 0.
Calibration methods as follow:
Step 1: Keep the module static.
Step 2: Open the “Config”and then click the “Reset Z-axis Angle”option, you
will see the angle of the Z-axis backs to 0 degree in the module data bar.