1. Product Overview
The WitMotion BWT901CL is a high-precision 9-axis Bluetooth Gyro Inclinometer and Digital Compass. It integrates an MPU9250 chip and utilizes Kalman Filtering for stable data output and excellent bias stability, ensuring low noise levels and increased accuracy. This device is designed for various applications requiring accurate motion and orientation sensing.
Key Features:
- 9-Axis Measurement: Provides 3-axis XYZ Acceleration, Angular rate, Gyro, Angle, and Magnet Field data.
- High Accuracy: Angle accuracy of X/Y-axis: 0.05° (Static), 0.1° (Dynamic).
- Kalman Filtering: Integrated R&D dynamic fusion algorithm and Kalman Filtering for stable and accurate data.
- Bluetooth 2.0: Wireless connection with up to 10m range (without obstacles).
- Compatibility: Supports Android OS, Windows PC, and Type-C MCU.
- Software Support: Free PC software and Smartphone APP available for data visualization, recording, and configuration.
- Built-in Battery: 3.7V Li-battery 260mAh, offering approximately 4 hours of working time.
- Compact Design: Small volume of 36*51.3*15mm and lightweight at 20g.
2. Setup Instructions
2.1 Package Contents
The standard package includes the BWT901CL sensor. Please check for any visible damage upon receipt.
2.2 Software and Documentation
To get started, you will need the WitMotion PC software and/or the Smartphone APP. Comprehensive tutorials, drivers, and sample code are available through the WitMotion document center.
2.3 Device Connection
- Power On: Turn on all BWT901CL devices using their respective power switches.
- Open WitMotion APP: Launch the WitMotion application on your mobile phone or PC software on your computer.
- Select Device: In the application, click 'Select Product' or 'Select Device' and choose 'BWT901CL'.
- Search and Connect: Click 'Search Device'. The application will list available Bluetooth devices (e.g., HC-06 ports). Connect to each device one by one. Once connected, you will see real-time data from the sensor(s).
PC Connection Notes:
- For stable data transmission to a Windows PC, a USB-HID adapter is recommended.
- If connecting multiple sensors to a PC simultaneously, you may need multiple adapters.
3. Operating Instructions
3.1 Using the PC Software
The free WitMotion PC software provides a comprehensive interface for interacting with your BWT901CL sensor. It allows for real-time data visualization, recording, and advanced configuration.
Software Functions:
- 3D DEMO: Visualize the sensor's motion state in an intuitive 3D environment.
- Data Display: View real-time acceleration, angular velocity, angle, and magnetic field data in charts and numerical formats.
- Data Recording & Playback: Record sensor data for later analysis and playback.
- Configuration Settings: Adjust parameters such as acceleration and magnetic calibration, placement direction, output frequency, bandwidth, and selectable output content.
3.2 Using the Smartphone APP
The WitMotion free app is available on Android and iOS. It allows for easy configuration and data management directly from your smartphone.
App Functions:
- Configuration: Easily adjust various settings of the sensor.
- Data Recording: Record sensor data directly on your phone.
- Data Export: Extract recorded data to TXT format for further manipulation and analysis.
4. Maintenance
4.1 Charging the Device
The BWT901CL features a built-in 3.7V Li-battery with 260mAh capacity, providing approximately 4 hours of continuous operation. Charge the device using a standard Type-C cable.
4.2 General Care
- Keep the device dry and clean.
- Avoid exposing the device to extreme temperatures or direct sunlight for prolonged periods.
- Handle with care to prevent physical damage.
5. Troubleshooting
5.1 Connection Issues
- Device not found: Ensure the BWT901CL is powered on and within the 10m Bluetooth range.
- Unstable PC connection: For Windows PC, a dedicated USB-HID Bluetooth adapter is recommended for stable data transmission. Laptop's built-in Bluetooth may have limited range or stability.
- Multiple devices: If connecting several sensors to a PC, ensure you have a sufficient number of Bluetooth adapters, as each sensor may require its own connection.
5.2 Software Compatibility
- The WitMotion PC software is compatible with Windows systems only (Win 11, 10, 8, 7, XP).
- For Linux, Python, or Mac systems, new SDKs are planned for future release. Please monitor WitMotion announcements for updates.
5.3 Data Accuracy
- Perform acceleration and magnetic calibration regularly using the provided software to maintain optimal accuracy.
- Ensure the sensor is placed in a stable environment during calibration.
6. Specifications
| Parameter | Value |
|---|---|
| Name | 9-axis Bluetooth Gyro Inclinometer |
| Brand | WitMotion |
| Battery | 3.7V Li-battery 260mAh |
| Working Current | <50mA |
| Communication | Bluetooth 2.0, Serial TTL |
| Data Output | 3 Axis (Acceleration, Gyro, Angle, Magnetic Field), Quaternion |
| Range | Acceleration: ±16g, Gyroscope: ±2000°/s, Magnetometer: ±4900uT, Angle: X, Z-axis: ±180°, Y ±90° |
| Resolution | Acceleration: 0.0005g, Gyro: 2000°/s |
| Stability | Acceleration: 0.01g |
| Angle Accuracy | Static: X Y 0.05°, Z 0.1deg (calibrated) |
| Frequency | 0.2Hz - 200Hz |
| Baud Rate | 115200bps (fixed) |
| Distance | 10M Bluetooth Coverage |
| Working Time | About 4 hours |
| Weight | 20g |
| Size | 51*36*15mm / 2.02"x1.41"x0.59" |
7. Warranty and Support
WitMotion provides lifetime technical support for the BWT901CL sensor. For any questions or assistance, please contact the support team.
Contact Information:
- Email: support@wit-motion.com (Normal response time: 12 hours)
Available Resources:
- Android App
- PC software
- Sample code
- Datasheet (PDF)
- Manual (PDF)
- README.txt
- Drivers
- Tutorial videos
8. User Tips
- Multi-Sensor Setup: When connecting multiple BWT901CL sensors to a PC, consider purchasing additional Bluetooth adapters for each sensor to ensure stable and simultaneous data acquisition.
- Wired Connection for MCUs: For Arduino or Raspberry Pi, a direct wired connection via a Type-C cable is generally simpler than Bluetooth pairing.
- Custom APP Development: If you plan to develop your own application, the Android APP's source code is available for reference. Understanding the communication protocol is essential for integrating sensor data into custom applications.
