WITMOTION BWT901CL Bluetooth Accelerometer+Inclinometer User Manual

1. Product Overview

The WITMOTION BWT901CL is a high-precision 9-axis IMU sensor integrating an accelerometer, gyroscope, angle sensor, and magnetometer. It features a Kalman Filter for stable data output and high bias stability. Designed for various applications, it offers flexible measurement ranges and output rates.

Figure 1: WITMOTION BWT901CL Bluetooth Accelerometer+Inclinometer.

This compact sensor is equipped with Bluetooth 2.0 for wireless connectivity, offering a 10-meter range without obstacles. It supports multi-connection via WITMOTION PC software (USB-HID adapter required) and features a 4-hour battery life with long-term measurement capability while recharging.

2. Package Contents

Upon unboxing, ensure all the following items are present:

• 1 x WitMotion BWT901CL Bluetooth 2.0 inclinometer
• 1 x Charging cable
• 1 x Welcome guide

(Note: USB-HID adapter not included and must be purchased separately for PC multi-connection.)

Figure 2: Contents included in the BWT901CL package.

3. Setup and Connection

3.1. Software/App Installation

The BWT901CL sensor can be connected and configured via both PC software and a mobile application. For the best experience, it is recommended to download the official WITMOTION software/app.

• For PC software and drivers, visit the official WITMOTION Wiki or GitHub repository.
• For mobile applications (iOS/Android), search "WITMOTION" in your device's respective app store.

Figure 3: WITMOTION PC Software Interface.

Figure 4: WITMOTION Multifunctional Android APP.

3.2. Bluetooth Connection Steps

Follow these steps to connect your BWT901CL sensor via Bluetooth:

1. Ensure Bluetooth is enabled on your smartphone or PC.
2. Open the WITMOTION application.
3. Turn on the sensor. For WT9011DCL, press and hold the button for 3 seconds until the green light flashes. For BWT901CL and BWT61CL, simply power them on.
4. In the app, navigate to the "Device Scan" or "Scan" section.
5. Select the corresponding device from the list. WT901BLECL will appear as "WT901BLE", and BWT901CL will appear as "HC-06".
6. Once connected, the app will display real-time sensor data.

Figure 5: Bluetooth connection overview.

Video 1: Demonstrates how to connect the WITMOTION Bluetooth sensors with an iPhone and use the iOS app. This video covers app installation, enabling Bluetooth access, scanning for devices, and connecting to different sensor models (WT9011DCL, BWT901CL, BWT61CL).

4. Operating the Sensor

4.1. Data Output and Interface

The WITMOTION app provides various data outputs and interfaces for monitoring the sensor's performance:

• Acceleration: Displays 3-axis acceleration data.
• Gyroscope: Shows 3-axis angular velocity.
• Angle: Provides pitch, roll, and yaw angles.
• Magnetic: Displays 3-axis magnetic field data.
• Quaternion: Shows quaternion values for orientation.

You can observe real-time data curves and numerical values for each parameter. The app also features a dashboard for an intuitive overview of all sensor attitude motion.

Figure 6: Software Dashboard for intuitive data viewing.

4.2. Calibration

Calibration is crucial for accurate sensor readings. The app provides options for:

• Acceleration Calibration: Place the sensor on a horizontal surface and initiate calibration. The X and Y acceleration values should return to 0, and Z-axis should show 1G, indicating successful calibration for acceleration bias.
• Magnetic Calibration: This requires careful execution to avoid magnetic interference. Ensure the sensor is away from mobile phones, computers, or metal surfaces. The calibration process involves rotating the sensor 360 degrees horizontally and vertically. The app will guide you through the steps.

Figure 7: Data stability with WitMotion Algorithm and Kalman Filtering.

4.3. Configuration Settings

Adjust various parameters to optimize sensor performance for your specific application:

• Output Rate: Change the data output frequency. The default is 10Hz, but it can be set up to a maximum of 200Hz.
• Factory Restore: Resets all settings to their default values.
• Rename Function: Allows you to customize the device name (e.g., "WT123").

Figure 8: Configuration Settings Interface.

4.4. Data Recording and Export

The app allows you to record sensor data and export it for further analysis. Recorded data can be saved in various formats, including TXT, which can then be imported into spreadsheet software like Excel for detailed review.

Figure 9: Data Storage & Export Functionality.

5. Maintenance

To ensure the longevity and optimal performance of your BWT901CL sensor, follow these general maintenance guidelines:

• Keep the device clean and free from dust and debris. Use a soft, dry cloth for cleaning.
• Avoid exposing the sensor to extreme temperatures, humidity, or direct sunlight.
• Store the device in a cool, dry place when not in use.
• Protect the sensor from physical shocks or drops, as this can affect its calibration and internal components.
• Regularly check for software/firmware updates from the official WITMOTION website to ensure you have the latest features and bug fixes.

6. Troubleshooting

Here are some common issues and their potential solutions:

7. Specifications

8. Warranty and Support

WITMOTION provides comprehensive support for its products:

• Warranty: 12-month warranty.
• Customer Service: Lifetime friendly customer service by the WitMotion team.
• Documentation: Visit wit-motion.com and find the support page for all kinds of documentation, software, instructions, and apps. You can also access the WITMOTION Google Drive to download tutorials.
• Video Tutorials: Find and subscribe to the WITMOTION YouTube channel for instructional videos and project experience sharing.
• Contact: For any assistance, contact support (at) wit-motion (dot) com.