USER MANUAL WT901

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Tutorial link

Google Drive

Link to instructions DEMO: WITMOTION Youtube Channel

If you have technical problems or cannot find the information that you need in the provided documents, please contact our support team. Our engineering team is committed to providing the required support necessary to ensure that you are successful with the operation of our AHRS sensors.

Contact

Technical Support Contact Info

Application

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

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Contents

• Tutorial link: 2
• Contact: 2
• Application: 2
• Contents: 3
• 1 Introduction: 4
• 1.1 Warning Statement: 5
• 2 Use Instructions: 6
• 3 Software Introduction: 7
• 4 MCU Connection: 8
• 5 IIC Connection: 9

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1 Introduction

The WT901 is a multi-sensor device detecting acceleration, angular velocity, angle as well as magnetic filed. The small outline makes it perfectly suitable for industrial retrofit applications such as condition monitoring and predictive maintenance. Configuring the device enables the customer to address a broad variety of use cases by interpreting the sensor data by smart algorithms.

WT901's scientific name is AHRS IMU sensor. A sensor measures 3-axis angle, angular velocity, acceleration, magnetic field. Its strength lies in the algorithm which can calculate three-axis angle accurately.

WT901 is employed where the highest measurement accuracy is required. It offers several advantages over competing sensor:

• Heated for best data availability: new WITMOTION patented zero-bias automatic detection calibration algorithm outperforms traditional accelerometer sensor
• High precision Roll Pitch Yaw (X Y Z axis) Acceleration + Angular Velocity + Angle + Magnetic Field output
• Low cost of ownership: remote diagnostics and lifetime technical support by WITMOTION service team
• Developed tutorial: providing manual, datasheet, Demo video, free software for Windows computer, APP for Android smartphones, and sample code for MCU integration including 51 serial, STM32, Arduino, Matlab, Raspberry Pi, communication protocol for project development
• WITMOTION sensors have been praised by thousands of engineers as a recommended attitude measurement solution

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1.1 Warning Statement

• Putting more than 5 Volt across the sensor wiring of the main power supply can lead to permanent damage to the sensor.
• VCC cannot connect with GND directly, otherwise it will lead to the burning of the circuit board.
• For proper instrument grounding: use WITMOTION with its original factory-made cable or accessories.
• For secondary developing project or integration: use WITMOTION with its compiled sample code.

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2 Use Instructions

Hit the hyperlink direct to the document or download center:

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

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3 Software Introduction

Software function introduction

(Ps. You can check the functions of the software menu from the link.)

A screenshot of the WITMOTION software interface is displayed, showing various sensor readings like Angle X, Angle Y, and Angle Z, along with a 3D pose visualization. The software includes menus for Language Configuration, Tools, Add device, View, Record, and Help. It also shows connection status with COM ports and baud rates.

The document lists the following sections within the software instructions:

• SOFTWARE INSTRUCTIONS: 1
• How to download software and driver: 1
• PC Software Download: 1
• Install Driver: 1
• Contents: 2
• 1 Use Instructions with PC: 4
• 1.1 Connect with wiring sensor: 4
• 1.2 Connecting with Bluetooth Sensor: 11
• 1.2.1 Select Sensor Model: 11
• 1.2.2 Search Device: 11
• 2 Main Menu: 13
• 2.1 Function configuration: 13
• 2.1.1 Record: 13
• 2.1.2 Data playback: 15
• 2.1.3 Tools: 15
• 2.1.4 View: 15
• 2.1.5 Help: 15
• 2.1.6 Language: 15
• 2.1.7 Configuration: 15
• 2.2 Data Review: 17
• 2.2.1 Main Interface: 17
• 2.2.2 Curve Display: 17
• 2.2.3 Map Function: 18
• 2.2.4 3D Demo: 19
• 2.2.5 Raw data: 20
• 3. Configuration: 21
• 3.1 Read sensor configuration: 21
• 3.2 System settings: 22
• 3.2.1 Reset: 22
• 3.2.2 Sleep and disable sleep: 23
• 3.2.3 Alarm setting: 24

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4 MCU Connection

A diagram illustrates the MCU connection. The MCU has pins labeled VCC, TX, RX, and GND. These are connected to the corresponding pins on the WT901 module, which also has VCC, TX, RX, and GND pins. The WT901 module is shown with its serial number and certifications.

Connection Diagram:

MCU Pinout: VCC, TX, RX, GND

WT901 Pinout: VCC, TX, RX, GND

Connections:

• MCU VCC to WT901 VCC
• MCU TX to WT901 RX
• MCU RX to WT901 TX
• MCU GND to WT901 GND

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5 IIC Connection

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

Note:

1. In order to connect multiple modules on the IIC bus, the IIC bus of the module is an open-drain output. When the MCU is connected to the module, the IIC bus needs to be pulled up to VCC through a 4.7K resistor.
2. VCC is 3.3V, it must be connected to the power supply. Directly using the power supply on the module may cause a voltage drop, so that the actual voltage of the module is not 3.3 ~ 5V.
3. The internal pull-up of the MCU is a weak pull-up, the driving capacity is limited, and an external pull-up on the hardware is required.

A diagram shows the IIC connection between the WT901 module and an MCU. Both VCC pins are connected, and pull-up resistors of 4.7K are shown. The WT901 module has pins for VCC, SCL, SDA, and GND. The MCU also has corresponding pins for VCC, SCL, SDA, and GND.

IIC Connection Diagram:

WT901 Module: VCC, SCL, SDA, GND

MCU: VCC, SCL, SDA, GND

Connections:

• WT901 VCC to MCU VCC
• WT901 SCL to MCU SCL
• WT901 SDA to MCU SDA
• WT901 GND to MCU GND
• Pull-up resistors (4.7K) are required on SCL and SDA lines.