WitMotion BWT61CL Bluetooth 2.0 Accelerometer and Inclinometer User Manual

1. Introduction

The WitMotion BWT61CL is a high-precision 6-axis Bluetooth 2.0 Gyro Inclinometer and Inertial Measurement Unit (IMU) sensor. It integrates an MPU6050 gyroscope, accelerometer, and angle measurement capabilities, offering an angle accuracy of 0.05 degrees (static) and 0.1 degrees (dynamic) on the X and Y axes. This device utilizes advanced WitMotion algorithms, derived from Aerospace Satellite Attitude Determination Algorithms, combined with Kalman filtering for stable data output, excellent bias stability, and low noise levels.

The BWT61CL is designed for a wide range of applications, including rehabilitation exercises, workplace injury prevention, patient care, sports monitoring, and short-range wireless motion measurement. It is also an ideal solution for IoT applications, environmental monitoring, Unmanned Ground Vehicles (UGV), energy management, mapping, building protection, and various industrial uses.

Image: The BWT61CL sensor shown alongside a smartphone displaying real-time acceleration, gyro, and angle data, highlighting its core functionalities including Bluetooth connectivity and Kalman filtering.

2. Package Contents

Upon opening your WitMotion BWT61CL package, please verify that all the following items are included:

• WitMotion BWT61CL Sensor
• USB-C Cable
• Product Manual / Documentation
• WitMotion Branded Box

Image: The BWT61CL sensor, its packaging box, a USB-C cable, and accompanying documentation.

3. Setup

3.1. Hardware Connection

• **Wired Connection (USB-C):** Connect the BWT61CL sensor to your computer or microcontroller (e.g., Arduino, Raspberry Pi) using the provided USB-C cable. This method is generally simpler for initial setup and data collection with MCUs.
• **Wireless Connection (Bluetooth 2.0):** The sensor supports Bluetooth 2.0 for wireless communication with a range of up to 10 meters (without obstacles).

3.2. Software Installation

The BWT61CL sensor can be used with dedicated applications for various platforms:

• **Smartphone App:** A free WitMotion app is available for both Android and iOS devices. Search for "WitMotion" in your device's app store.
• **PC Software:** WitMotion provides free PC software compatible with Windows operating systems (Windows 11, 10, 8, 7, and XP). This software allows for configuration, real-time data display, recording, and playback.

For advanced users and developers, a comprehensive Development Kit is available, which includes:

• Datasheet (PDF)
• User Manual (PDF)
• README.txt
• Drivers (CH340 & CP2102)
• DEMO Videos
• PC Software
• Android/iOS APP
• Protocol and source codes for custom application development (e.g., Python, Raspberry Pi, STM32, Arduino, Windows C++/C#).

Image: Overview of the WitMotion Development Kit, showing various software, drivers, documentation, and programming language support.

4. Operating Instructions

4.1. Connecting via Bluetooth

The BWT61CL sensor can connect wirelessly to compatible devices via Bluetooth 2.0. The effective range is approximately 10 meters. For Windows PC connections, a BLE 5.0 adapter is required as the sensor cannot directly pair with a laptop's built-in Bluetooth for data output.

Image: The BWT61CL sensor wirelessly connected to a smartphone via Bluetooth, illustrating the 10-meter coverage range.

4.2. Using the Smartphone App

The WitMotion smartphone app provides an intuitive interface for configuring the sensor and viewing real-time data. Key features include:

• Real-time display of acceleration, angular velocity, and angle data.
• Configurable settings for the sensor.
• Data recording and extraction to TXT format for further analysis.

Image: Screenshots of the WitMotion smartphone app, showing system status, data graphs, configuration options, and recorded data in TXT format.

4.3. Using the PC Software

The WitMotion PC software offers comprehensive functionalities for data acquisition and analysis:

• **3D DEMO:** Visualize the sensor's motion state in a 3D environment.
• **Real-time Data Display:** View data curves and charts in real-time.
• **Data Recording and Playback:** Record sensor data and play it back for review.
• **Raw Data Reviewing:** Access and review raw sensor data.
• **Configuration Settings:** Adjust parameters such as acceleration calibration, placement direction, reset Z-axis angle, output frequency, and bandwidth.
• **Data Export:** Easily extract analyzed data to TXT files, which can then be pasted into Excel for further manipulation.

Image: The WitMotion PC software interface, showcasing features like 3D model visualization, data recording, and configuration options.

Image: The 'Config' menu within the WitMotion PC software, showing options for resetting Z-axis angle, acceleration calibration, baudrate, mode, direction, static threshold, and bandwidth.

4.4. Data Output

The BWT61CL outputs 3-axis acceleration, gyroscope, angle, and quaternion data.

5. Maintenance

• **Battery:** The sensor is equipped with a 3.7V Li-battery (260mAh) providing up to 4 hours of working time. Recharge the device using the provided USB-C cable when the battery is low.
• **Cleaning:** Keep the sensor clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using harsh chemicals or abrasive materials.
• **Storage:** Store the sensor in a cool, dry place away from direct sunlight and extreme temperatures when not in use.

6. Troubleshooting

6.1. Bluetooth Connection Issues

• **Windows PC Connection:** The BWT61CL (WT901BLECL) cannot directly pair with a laptop's built-in Bluetooth for data output. A dedicated BLE 5.0 adapter is required for Bluetooth connection to a Windows PC.
• **Multiple Sensors:** If connecting multiple sensors simultaneously, each sensor may require its own BLE adapter to pair and establish communication.
• **Range:** Ensure the sensor is within the 10-meter Bluetooth coverage range and that there are no significant obstacles impeding the signal.

6.2. Software Compatibility

• **PC Software:** The WitMotion PC software is exclusively compatible with Windows operating systems (Win 11, 10, 8, 7, XP). It does not support Linux, Python systems, or Mac computers.

6.3. Microcontroller Integration (Arduino/Raspberry Pi)

• **Wired Connection:** For easier integration with Arduino or Raspberry Pi, a direct wired connection using a Type-C cable is recommended.
• **Bluetooth Connection:** If using Bluetooth with MCUs, the BWT61CL acts as a slave device. A Bluetooth adapter configured as a master is required to establish communication. Alternatively, consider using serial sensors (e.g., WT901 modules) for simpler IMU data collection with MCU boards.

7. Specifications

Image: Detailed technical specifications table and mechanical dimensions of the BWT61CL sensor.

8. User Tips

• **Initial Setup:** A step-by-step manual is included in the box to guide you through the initial setup process. Refer to it first for quick configuration.
• **Bluetooth for PC:** Remember that a BLE 5.0 adapter is crucial for connecting the sensor to a Windows PC via Bluetooth, as direct pairing with a laptop's built-in Bluetooth may not provide data output.
• **MCU Integration:** For simpler integration with Arduino or Raspberry Pi, consider using a wired Type-C connection. If Bluetooth is necessary, ensure your MCU setup can act as a master to the sensor's slave role, or explore WitMotion's serial sensor modules for easier compatibility.
• **App Development:** If you plan to develop your own application, the Android app's source code is available for reference. Familiarize yourself with the communication protocol for effective data integration.

9. Warranty and Support

For any questions, technical assistance, or support regarding your WitMotion BWT61CL sensor, please contact the WitMotion support team directly at support@wit-motion.com. The typical response time is within 12 hours.

WitMotion also offers customization services, including OEM branding (logo printing) and tailored functional modifications for large quantity orders (20 pieces or more). Please contact the support team for more details on customization requests.