USER MANUAL WT901

Tutorial and Support Resources

Access valuable resources to help you get started and troubleshoot:

• Google Drive for documentation.
• WITMOTION YouTube Channel for video tutorials and demonstrations.

If you encounter technical problems or need further information not found in the provided documents, please contact the WITMOTION support team. Our engineering team is dedicated to providing the necessary support to ensure your successful operation of our AHRS sensors.

Technical Support Contact Info

Applications

The WT901 sensor is versatile and used in a wide range of applications, including:

• AGV Truck
• Platform Stability
• Auto Safety System
• 3D Virtual Reality
• Industrial Control
• Robot
• Car Navigation
• UAV (Unmanned Aerial Vehicle)
• Truck-mounted Satellite Antenna Equipment

1 Introduction

The WT901 is a multi-sensor device capable of detecting acceleration, angular velocity, angle, and magnetic field. Its compact size makes it ideal for industrial retrofit applications, such as condition monitoring and predictive maintenance. By interpreting sensor data through smart algorithms, the device can be configured to address a broad variety of use cases.

The WT901's scientific designation is AHRS IMU sensor. It measures 3-axis angle, angular velocity, acceleration, and magnetic field. Its primary strength lies in its algorithm, which accurately calculates three-axis angles. The WT901 is employed in applications requiring the highest measurement accuracy.

It offers several advantages over competing sensors:

• Heated for best data availability: The new WITMOTION patented zero-bias automatic detection calibration algorithm outperforms traditional accelerometer sensors.
• High precision Roll Pitch Yaw (X Y Z axis) output for Acceleration, Angular Velocity, Angle, and Magnetic Field.
• Low cost of ownership, featuring remote diagnostics and lifetime technical support from the WITMOTION service team.
• Developed tutorial resources are available, including manuals, datasheets, demo videos, free software for Windows, an Android smartphone app, and sample code for MCU integration (e.g., 51 serial, STM32, Arduino, Matlab, Raspberry Pi), along with communication protocols for project development.
• WITMOTION sensors have been praised by thousands of engineers as a recommended attitude measurement solution.

1.1 Warning Statement

Please observe the following safety precautions to prevent damage to the sensor and ensure proper operation:

• Applying more than 5 Volts across the sensor wiring from the main power supply can lead to permanent damage to the sensor.
• Connecting VCC directly to GND will result in the burning of the circuit board.
• For proper instrument grounding, use WITMOTION with its original factory-made cable or accessories.
• For secondary development projects or integration, use WITMOTION with its compiled sample code.

2 Use Instructions

Access the document or download center by clicking on the following hyperlinks:

• Software and driver download
• Quick-guide Manual
• Teaching Video
• Common Software with detailed instructions
• SDK (sample code)
• SDK Tutorial Documentation
• Communication Protocol

3 Software Introduction

This section introduces the software used with the WT901 sensor. You can explore the software's functions via the provided link.

A screenshot displays the WITMOTION software interface, showing real-time sensor data (Angle X, Y, Z), configuration options, and various data visualization tools like curves and 3D pose.

Software Function Introduction

The software provides comprehensive tools for data acquisition, configuration, and analysis. Below is a detailed breakdown of its structure:

• SOFTWARE INSTRUCTIONS
  • How to download software and driver
  • PC Software Download:
  • Install Driver
• Contents
• 1 Use Instructions with PC
  • 1.1 Connect with wiring sensor
  • 1.2 Connecting with Bluetooth Sensor
    • 1.2.1 Select Sensor Model
    • 1.2.2 Search Device
• 2 Main Menu
  • 2.1 Function configuration
    • 2.1.1 Record
    • 2.1.2 Data playback
    • 2.1.3 Tools
    • 2.1.4 View
    • 2.1.5 Help
    • 2.1.6 Language
    • 2.1.7 Configuration
  • 2.2 Data Review
    • 2.2.1 Main Interface
    • 2.2.2 Curve Display
    • 2.2.3 Map Function
    • 2.2.4 3D Demo
    • 2.2.5 Raw data
• 3. Configuration
  • 3.1 Read sensor configuration
  • 3.2 System settings
    • 3.2.1 Reset
    • 3.2.2 Sleep and disable sleep
    • 3.2.3 Alarm setting

4 MCU Connection

This section details how to connect the WT901 module to a microcontroller unit (MCU) using a serial interface.

A diagram shows an MCU with pins labeled VCC, TX, RX, GND. These are connected to a WT901 sensor with corresponding VCC, RX, TX, GND pins, indicating a serial communication interface.

5 IIC Connection

The WT901 module can be connected to the MCU through the IIC interface. The connection method is illustrated below.

Notes on IIC Connection:

• To connect multiple modules on the IIC bus, note that the IIC bus of the module is an open-drain output. When the MCU is connected to the module, the IIC bus requires pull-up resistors to VCC, typically a 4.7K resistor.
• The VCC for the WT901 is 3.3V and must be connected to an appropriate power supply. Directly using a higher voltage power supply on the module may cause a voltage drop, resulting in an actual operating voltage outside the expected 3.3V to 5V range.
• The internal pull-up resistors on the MCU can be weak, limiting driving capacity. Therefore, an external pull-up resistor on the hardware is often required for reliable communication.

A diagram illustrates an MCU with pins labeled VCC, SCL, SDA, GND. The VCC pin is connected to two 4.7K resistors, one to SCL and one to SDA. The SCL and SDA pins are connected to the WT901 sensor's SCL and SDA pins respectively. The GND pins are connected.