1. Introducció
The WITMOTION WT901 is a high-accuracy 9-axis Inertial Measurement Unit (IMU) sensor designed for precise measurement of acceleration, angular velocity (gyroscope), tilt angle, and magnetic field. It integrates a Cortex-M0 core processor, highly-integrated MEMS sensors, and a Kalman filtering algorithm to ensure stable data output, excellent bias stability, and low noise levels, enhancing measurement accuracy. This sensor is suitable for various integration projects requiring reliable attitude measurement.
The sensor provides rock-solid data output for 3-axis XYZ (Pitch, Roll, Yaw) acceleration, gyroscope, angle, magnetic field, and Quaternion. Its measurement range and output rate (0.2-200Hz) are selectable, offering flexibility for diverse applications.
2. Què hi ha a la caixa
Upon opening your WITMOTION WT901 package, you should find the following items:
- 1 x WitMotion WT901 TTL Accelerometer Sensor
- 2 x Six-pin male headers (1x6)
- 1 x Welcome guide
Please note that a USB-UART converter is not included and may need to be purchased separately for certain connection types.
3. Configuració
3.1. Connexió de maquinari
Assegureu-vos que totes les connexions estiguin segures abans d'encendre el dispositiu.
3.1.1. TTL Interface Wiring
For TTL serial communication, connect the sensor to your microcontroller or USB-UART converter using the provided male headers. Ensure correct pin mapping for VCC, GND, TX, and RX.
Video 1: Demonstrates how to wire the TTL port of the inclinometer sensor module for proper connection.
Video 2: Provides instructions on how to use the TTL port of the 6-axis tilt sensor, detailing the connection process.
3.2. Instal·lació de programari
The WITMOTION sensor requires dedicated software for configuration, data visualization, and recording. Visit wit-motion.com to download the latest PC software and mobile applications.
3.2.1. PC Software Connection
After installing the PC software, connect the sensor via a USB-UART converter (not included). Ensure the correct COM port and baud rate are selected in the software.
Video 3: Instructions on how to connect the PC software and use it for sensor data acquisition and analysis.
Video 4: Detailed instructions for using the WT901 Acceleration Sensor with PC software, covering various functionalities.
3.2.2. Mobile App Connection (iOS/Android)
Download the 'WITMOTION' app from your device's app store. Enable Bluetooth and location services on your smartphone. Open the app, select the appropriate sensor series (e.g., BLE 5.0 Series), and scan for your device. The sensor's blue LED will flash, indicating it's discoverable.
Video 5: Provides instructions on how to use the WT901BLE sensor with an Android smartphone, including app usage and connection.
Video 6: Demonstrates how to connect and use the iOS app with WITMOTION Bluetooth sensors.
4. Instruccions de funcionament
4.1. Data Monitoring and Recording
The WITMOTION software provides a dashboard for real-time data monitoring, including acceleration, angular velocity, angle, and magnetic field. You can also record data for later analysis.
4.2. Configuració del sensor
The software allows you to configure various sensor parameters, such as output rate, measurement range, and communication settings, to suit specific application requirements.
4.3. Calibration Procedures
For optimal accuracy, it is recommended to perform calibration procedures before initial use and periodically thereafter.
4.3.1. Calibració de l'acceleració
Place the sensor on a horizontal, stable surface. In the software, initiate acceleration calibration. The sensor will automatically adjust its acceleration bias to ensure accurate readings, typically resulting in 0g on X and Y axes and 1g on the Z-axis when stationary.
4.3.2. Magnetic Field Calibration
Magnetic field calibration is crucial for accurate heading information. Ensure the sensor is away from any magnetic interference (e.g., mobile phones, computers, metal objects). Follow the on-screen instructions in the software to rotate the sensor 360 degrees around its X, Y, and Z axes. This process helps the sensor map the local magnetic field and correct for distortions.
Video 7: Demonstrates the Accelerometer Magnetic Field Calibration using Spherical Fitting, a key step for accurate magnetic readings.
5. Manteniment
- Keep the sensor clean and free from dust and debris.
- Eviteu exposar el sensor a temperatures o humitat extremes.
- Handle the sensor with care to prevent physical damage.
- Store the sensor in a dry, static-free environment when not in use.
6. Solució De Problemes
6.1. No Data Output
- Check all wiring connections for proper seating and correct pin assignments (VCC, GND, TX, RX).
- Verify the COM port and baud rate settings in the software match your sensor's configuration.
- Ensure the sensor is powered correctly (3.3V-5V).
6.2. Lectures inexactes
- Perform acceleration calibration on a flat, stable surface.
- Conduct magnetic field calibration away from magnetic interference.
- Ensure the sensor is mounted securely and not subject to vibrations.
6.3. Problemes de connexió (Bluetooth)
- Assegureu-vos que el Bluetooth estigui habilitat al vostre telèfon intel·ligent/ordinador.
- Verify location services are enabled for the mobile app.
- Restart the sensor and the app/software.
- Check if the sensor is within the Bluetooth range.
7. Especificacions
| Característica | Descripció |
|---|---|
| Model | WT901 |
| Marca | WITMOTION |
| Voltage | 3.3V-5V |
| Actual | <12 mA |
| Interfície | Serial TTL/IIC (support high speed 400K) |
| Sortida | Acceleration, Gyro, Magnetic, Angle, Quaternion |
| Range (Acceleration) | ±2/4/8/16g (adaptive) |
| Range (Gyro) | ±2000°/s |
| Range (Magnetic) | ±2Gauss |
| Range (Angle) | X, Z: ±180°, Y: ±90° |
| Angle Accuracy (X, Y-axis) | 0.05° (after calibrated, no magnetic field interference) |
| Taxa de retorn | 0.2-200Hz (default: 10Hz) |
| Velocitat de transmissió | 4800-230400 bps (IIC Speed: 400k) |
| Acceleration Resolution | ±2g: 0.061mg/LSB (16384LSB/g) ±4g: 0.12mg/LSB (8192LSB/g) ±8g: 0.25mg/LSB (4096LSB/g) ±16g: 0.5mg/LSB (2048LSB/g) |
| Mida | 15.24*15.24*2mm / 0.6" x 0.6" x 0.08" |
| Temperatura de funcionament | -40 °C a +85 °C |
| Muntatge | Direction: Horizontal / Vertical |
| Pes net | 1g |
8. Garantia i assistència
8.1. Informació de la garantia
The WITMOTION WT901 sensor comes with a 12-month warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use. Please retain your proof of purchase for warranty claims.
8.2. Atenció al client
For any technical assistance, documentation, software, or application-related queries, please refer to the following resources:
- Tutorials en línia: The tutorial link is printed on the guiding card inside the product package.
- Weblloc: Visita wit-motion.com and navigate to the support page for comprehensive documentation, software, and instructions.
- Canal de YouTube: Find and subscribe to the WITMOTION YouTube channel for instructional videos and project experience sharing.
- Suport per correu electrònic: Contact our friendly customer service team at support@wit-motion.com for lifetime support.