1. Introduction and Overview
The WITMOTION WT901BLE is a high-precision 9-axis Inertial Measurement Unit (IMU) sensor, integrating an accelerometer, gyroscope, angle sensor, and magnetometer. It utilizes Bluetooth 5.0 for wireless communication and incorporates advanced Kalman Filtering algorithms to ensure stable and accurate data output. This sensor is designed for various applications requiring precise attitude measurement, such as robotics, motion tracking, and industrial control systems, and is compatible with Android smartphones and Windows computers.
Figure 1.1: The WT901BLE MPU9250 IMU Sensor Module. This image displays the compact blue circuit board of the sensor, highlighting its integrated components.
2. Product Features
- High Performance Data Output: Provides accurate 3-axis XYZ (Pitch, Roll, Yaw) Acceleration, Gyroscope, Angle, and Magnetic field data.
- Bluetooth 5.0 Connectivity: Features low-power Bluetooth 5.0, offering a reliable wireless connection within a 50-meter range (without obstacles).
- Broad Compatibility: Compatible with Android smartphones (supporting multiple connections for up to 4 sensors simultaneously) and Windows computers.
- Advanced Filtering: Integrates R&D dynamic fusion algorithm and Kalman Filtering for stable data output, excellent bias stability, and low noise levels, enhancing measurement accuracy.
- Robust Design: Built with quality components including a 168MHz core MCU and embedded MEMS sensor chip for stable and reliable performance.
Figure 2.1: Superior Components Hardware Analysis. This diagram illustrates the internal components of the WT901BLE sensor, including the built-in Bluetooth antenna, 168MHz core MCU, embedded MEMS sensor chip, and power chip for voltage stability.
Figure 2.2: Tilt Angle Sensing and Application. This image demonstrates the sensor's capability in tilt angle sensing, showing its potential use in applications like human motion analysis or robotics, alongside graphs illustrating acceleration and angle data.
3. Package Contents
Upon opening the package, please verify that all the following items are included:
- 1 x WT901BLE BLE 5.0 Sensor Module
- 2 x Six-pin Male Headers (1x6)
- 1 x Welcome Guide
Figure 3.1: WT901BLE Package Contents. This image shows the WT901BLE sensor module along with the included six-pin male headers, typically used for connecting the module to a breadboard or other circuitry.
4. Setup and Installation
The WT901BLE sensor can be integrated into various projects and systems. Basic setup involves connecting the module and establishing communication via Bluetooth.
4.1 Hardware Connection
Connect the WT901BLE module to your development board (e.g., Arduino) or power supply using the provided male headers. Ensure correct pin assignments for power (VCC, GND) and data communication if using a wired connection for initial setup or debugging. For Bluetooth operation, only power is required for the module itself.
4.2 Software Installation and Pairing
To utilize the sensor's data, you will need the appropriate software:
- For Android Devices: Download the official WITMOTION app from the Google Play Store. Enable Bluetooth on your Android device and open the app to scan for and connect to the WT901BLE sensor. The app supports connecting up to four sensors simultaneously.
- For Windows Computers: Download the WITMOTION PC software and drivers from the official WIT-MOTION website (www.wit-motion.com). Install the software and ensure your computer's Bluetooth is enabled. Follow the software instructions to pair and connect to the sensor.
Figure 4.1: Multiple Connection with Android Phone. This image illustrates the capability of the WT901BLE sensor to connect to an Android smartphone, showing the phone's screen displaying data from multiple connected sensors.
Figure 4.2: Android App Interface. A close-up of an Android smartphone screen showing the WITMOTION application interface, displaying real-time angle and magnetic field data from the WT901BLE sensor.
Figure 4.3: Windows Software Interface. This image displays the WITMOTION Attitude Measurement System software running on a laptop, showing real-time angle data (Angle X, Angle Y, Angle Z) and a 3D visualization of the sensor's orientation.
5. Operating Instructions
Once connected, the WT901BLE sensor will begin transmitting data. The specific operation will depend on your application and the software used.
5.1 Data Acquisition
The sensor outputs 9-axis data: 3-axis acceleration, 3-axis angular velocity (gyroscope), and 3-axis magnetic field. Additionally, it provides calculated Euler angles (Pitch, Roll, Yaw) with 0.05° accuracy, thanks to its integrated Kalman Filtering. Data can be viewed in real-time through the WITMOTION software/app and typically logged for later analysis.
5.2 Calibration
For optimal accuracy, especially for the magnetometer, periodic calibration may be required. Refer to the specific instructions within the WITMOTION PC software or Android app for calibration procedures. This usually involves rotating the sensor in specific patterns to map the magnetic field or performing an accelerometer offset calibration.
6. Maintenance
To ensure the longevity and reliable performance of your WT901BLE sensor, follow these general maintenance guidelines:
- Handle with Care: The sensor is a sensitive electronic device. Avoid dropping it or subjecting it to strong impacts.
- Keep Dry: Protect the module from moisture, humidity, and liquids. Water damage can severely impair its functionality.
- Temperature Control: Operate and store the sensor within its specified temperature range. Avoid extreme hot or cold environments.
- Cleanliness: Keep the module free from dust and debris. Use a soft, dry cloth for cleaning if necessary. Do not use harsh chemicals.
- Avoid Strong Magnetic Fields: While the sensor includes a magnetometer, prolonged exposure to strong external magnetic fields can affect its calibration and accuracy.
7. Troubleshooting
If you encounter issues with your WT901BLE sensor, consider the following common troubleshooting steps:
- No Bluetooth Connection:
- Ensure the sensor is powered on.
- Verify Bluetooth is enabled on your Android device or Windows computer.
- Make sure the sensor is within the 50-meter Bluetooth range and there are no significant obstacles.
- Restart the sensor, your device, and the WITMOTION application/software.
- Check if other Bluetooth devices are interfering.
- Inaccurate Data Readings:
- Perform a sensor calibration using the WITMOTION software/app.
- Ensure the sensor is mounted securely and not vibrating excessively.
- Check for strong magnetic interference in the environment if magnetometer readings are erratic.
- Verify the sensor's orientation matches the expected coordinate system in your application.
- Software Not Recognizing Sensor:
- For Windows, ensure the correct drivers are installed.
- Update the WITMOTION software to the latest version.
- Check your device's Bluetooth settings to confirm the sensor is paired or discoverable.
For further assistance, please refer to the support resources mentioned in Section 9 or contact WITMOTION customer service directly.
8. Specifications
| Feature | Detail |
|---|---|
| Model | WT901BLE |
| Sensor Type | 9-axis IMU (Accelerometer, Gyroscope, Magnetometer, Angle) |
| Bluetooth Version | Bluetooth 5.0 |
| Bluetooth Range | Up to 50 meters (unobstructed) |
| Angle Accuracy | 0.05° |
| Filtering | Kalman Filtering |
| Compatibility | Android Smartphones, Windows Computers |
| Package Dimensions | 2.99 x 2.99 x 0.87 inches |
| Weight | 0.32 ounces |
| Manufacturer | WitMotion |
| First Available Date | December 7, 2017 |
9. Support and Warranty
WITMOTION is committed to providing comprehensive support for its products.
9.1 Warranty Information
The WT901BLE sensor comes with a 12-month warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For any questions, technical assistance, or support, please utilize the following resources:
- Official Website: Visit the WIT-MOTION official website at www.wit-motion.com. The support page provides access to documentation, software, instructions, and application guides. You can also find a link to the WITMOTION Google Drive for tutorials.
- YouTube Channel: Subscribe to the WITMOTION YouTube channel for instructional videos, lessons, and project experience sharing.
- Email Support: Contact the WITMOTION support team directly via email at support@wit-motion.com for personalized assistance.
- Welcome Guide: A tutorial link is printed on the guiding card included in your product package.
WITMOTION is dedicated to providing lifetime friendly customer service.
