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WITMOTION HWT901B-TTL

WITMOTION HWT901B-TTL 9축 가속도계 및 경사계 사용 설명서

Model: HWT901B-TTL

1. 서론

This user manual provides detailed instructions for the setup, operation, calibration, and maintenance of the WITMOTION HWT901B-TTL 9-Axis Accelerometer and Inclinometer. This device is designed for precise motion sensing applications, integrating a gyroscope, accelerometer, digital compass, air pressure sensor, and altitude measurement capabilities. It features RM3100 magnetometer compensation and Kalman filtering for enhanced accuracy and stability.

2. 안전 정보

Please read and understand all safety precautions before operating the device. Failure to follow these instructions may result in damage to the product or personal injury.

  • 전원 공급 장치: Ensure the device is powered within its specified voltage range (e.g., 5V for TTL version). Incorrect voltag영구적인 손상을 일으킬 수 있습니다.
  • 사이: Verify all wiring connections are correct before applying power. Incorrect wiring can lead to short circuits or component failure.
  • 환경: Avoid exposing the device to extreme temperatures, humidity, or corrosive environments unless specifically rated for such conditions.
  • 손질: Handle the sensor with care to prevent physical shock or damage to internal components.
  • 구경 측정: Perform calibration procedures in a stable environment, free from strong magnetic interference, to ensure accurate readings.

3. 패키지 내용

포장을 개봉하시면 아래 나열된 모든 품목이 있는지, 그리고 양호한 상태인지 확인해 주십시오.

  • 1 x HWT901B-TTL Sensor
  • 연결 케이블 1개
  • 1 x Instruction Card
  • (Optional, depending on kit) USB-TTL Serial Converter
  • (Optional, depending on kit) Type-C Adapter
WITMOTION HWT901B-TTL package contents
Figure 3.1: Contents of the WITMOTION HWT901B-TTL package, including the sensor, cable, and instruction card.

4. 제품 오버view

The WITMOTION HWT901B-TTL is an industrial-grade 9-axis sensor module designed for high-precision attitude measurement. It integrates a 32-bit processor, MPU9250 (accelerometer, gyroscope), RM3100 magnetometer, and a BMP280 air pressure sensor. The device utilizes advanced R&D dynamic fusion algorithms and Kalman filtering to provide stable and accurate data output for pitch, roll, yaw, acceleration, angular velocity, magnetic field, air pressure, and altitude.

WITMOTION HWT901B-TTL sensor module
그림 4.1: 전면 view of the HWT901B-TTL sensor module, showing its compact design and labeling.
Internal components of HWT901B-TTL sensor
그림 4.2: 내부 view of the HWT901B-TTL, highlighting key components such as the 32-bit Cortex-M0 processor, accelerometer, gyroscope, RM3100 magnet field sensor, and BMP280 air pressure sensor.

주요 특징:

  • 10-Axis Measurement: Pitch, Roll, Yaw (X, Y, Z axis), Accelerometer, Angular Velocity, Angle, Magnet Field, Air Pressure, Height.
  • 높은 정확도: Angle measurement accuracy up to 0.05 degrees (X, Y-axis) with low Z-axis drift.
  • 고급 필터링: Integrated Kalman Algorithm and RM3100 magnetometer compensation for stable and precise data.
  • 견고한 디자인: Equipped with a 32-bit processor and highly-integrated MEMS module for performance in challenging environments.
  • Selectable Output Rate: Data output rate configurable from 0.2Hz to 200Hz.
Dimensions of WITMOTION HWT901B-TTL sensor
Figure 4.3: Dimensional drawing of the HWT901B-TTL sensor, showing its length, width, and height in millimeters.

5. 설정 지침

5.1. PC 연결

  1. Install Serial Driver: Download and install the appropriate serial driver (e.g., CH340) for your operating system.
  2. 하드웨어 연결: Connect the HWT901B-TTL sensor to your PC using a USB-TTL serial converter. Ensure VCC, TX, RX, and GND pins are correctly matched (VCC-VCC, TX-RX, RX-TX, GND-GND).
  3. COM 포트를 확인하십시오. Open Device Manager on your PC and locate the assigned COM port for the serial converter.
  4. 소프트웨어 실행: Open the WITMOTION PC software (Minimu.exe).
  5. Select Port and Baud Rate: In the software, select the identified COM port and the correct baud rate (default is typically 9600). Data should appear automatically. If not, manually select the COM port and baud rate.
PC software interface for HWT901B-TTL
Figure 5.1: The HWT901B-TTL connected to a PC via a serial converter, displaying real-time data on the WITMOTION software interface.

Video Guide: PC Connection and Basic Operation

This video demonstrates the process of connecting the HWT901B-TTL sensor to a PC, installing necessary drivers, and viewing data using the WITMOTION software.

5.2. Android Smartphone Connection

  1. 앱 설치: Install the WITMOTION APK file on your Android smartphone. Grant necessary permissions, especially "Storage" and "Location".
  2. 하드웨어 준비: You will need the HWT901B-TTL sensor, a USB-TTL cable, and a Type-C OTG adapter (if your phone has a Type-C port, adapter may need to be purchased separately).
  3. 하드웨어 연결: Connect the sensor to the USB-TTL cable, then connect the USB-TTL cable to your smartphone via the OTG adapter.
  4. 앱 열기: Launch the WITMOTION APP.
  5. Select Module Type: Choose "9-axis Series" from the module selection.
  6. Select Baud Rate: Select the appropriate baud rate (default 9600). Connection should succeed, and data will be displayed.
Android smartphone connection for HWT901B-TTL
Figure 5.2: The HWT901B-TTL connected to an Android smartphone using a USB-TTL converter and a Type-C adapter.

Video Guide: Android Smartphone Connection

This video illustrates the steps to connect the HWT901B-TTL sensor to an Android smartphone and view real-time data through the WITMOTION application.

6. 사용 설명서

The WITMOTION software and Android app provide various interfaces for monitoring and configuring the HWT901B-TTL sensor.

6.1. 데이터 표시

Once connected, the software/app will display real-time sensor data, including:

  • 메인 인터페이스: Shows current Pitch, Roll, and Yaw angles.
  • Acceleration Graph: Visualizes X, Y, Z axis acceleration over time.
  • Angular Velocity Graph: Displays X, Y, Z axis angular velocity over time.
  • Angle Graph: Plots Pitch, Roll, and Yaw angles over time.
  • Magnetic Field Graph: Shows magnetic field strength along X, Y, Z axes.
  • 데이터 재view: Presents raw and processed data in tabular format.
WITMOTION PC software data and configuration interfaces
그림 6.1: 이상view of the PC software interface, showing data display, configuration options, and 3D demonstration capabilities.
WITMOTION Android app interfaces for data display and configuration
Figure 6.2: Various screens of the multifunctional Android application, illustrating data output, configuration settings, and different graph displays.

6.2. 3D 데모

The PC software includes a 3D visualization tool that allows you to observe the sensor's orientation in real-time. You can select different 3D models (car, head, plane, cube) to represent the sensor's movement.

Before using the 3D demonstration, calibrate the direction of the 3D model using the arrow control keys to match the sensor's axial direction.

7. 교정

Regular calibration ensures the highest accuracy of the HWT901B-TTL sensor. Perform calibration in a stable environment, away from strong magnetic fields.

7.1. 가속도 교정

  1. Place the module face up on a horizontal plane.
  2. In the software/app, navigate to the calibration section and select "Acceleration Calibration".
  3. Click "Start Calibration". The system will automatically calculate the calibration value. Keep the module still for 2-3 seconds.
  4. Click "Complete Calibration" or "End Calibration".
  5. Click "Write Parameter" or "Save Config" to save the parameters to the sensor.
  6. To confirm successful writing, read the parameters again. After calibration, the Z-axis acceleration should read approximately 1g.

7.2. Magnetic Field Calibration

Magnetic field calibration compensates for local magnetic interference.

  1. In the software/app, navigate to the calibration section and select "Magnetic Field Calibration".
  2. Click "Start Calibration".
  3. Rotate the sensor 360 degrees around its X, Y, and Z axes respectively. Ensure the sensor covers a full sphere of orientations during rotation.
  4. Click "End Calibration" or "Magnetic Field Calibration Finish".
  5. Click "Write Parameter" or "Save Config" to save the parameters to the sensor.

8. 데이터 로깅 및 내보내기

The WITMOTION software and app allow you to record and export sensor data for further analysis.

  • 녹음: In the software/app, navigate to the "Record" or "Data" tab and click the "Start" or "Record" button to begin logging data.
  • 멎는: Click "Stop" to end the recording.
  • 내보내다: The recorded data can typically be extracted as a TXT file or other formats (e.g., CSV, BIN, PLAY) depending on the software version. For Android, recorded files are usually saved in the phone's root directory under a "Records" folder.
Data storage and export features of WITMOTION sensor
Figure 8.1: The sensor's capability for powerful data storage and export, showing acceleration and angle charts.

9. 유지관리

To ensure the longevity and optimal performance of your HWT901B-TTL sensor, follow these maintenance guidelines:

  • 청소: Keep the sensor clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using harsh chemicals or abrasive materials.
  • 저장: Store the sensor in a dry, cool environment when not in use. Protect it from extreme temperatures and humidity.
  • 케이블 무결성: Regularly inspect the connection cable for any signs of wear, cuts, or damage. Replace damaged cables immediately.
  • 펌웨어 업데이트: Check the official WITMOTION web사이트 (위트모션닷컴) for any available firmware updates to improve performance or add new features.

10. 문제 해결

If you encounter issues with your HWT901B-TTL sensor, refer to the following common problems and solutions:

문제 가능한 원인 해결책
No data output in software/app.
  • Incorrect serial driver installation.
  • Wrong COM port selected.
  • Incorrect baud rate.
  • 배선 연결이 느슨합니다.
  • Sensor not powered.
  • Reinstall serial driver.
  • Verify COM port in Device Manager.
  • Ensure baud rate (default 9600) matches.
  • Check all wiring connections (VCC, TX, RX, GND).
  • Confirm power supply is connected and active.
Inaccurate angle readings.
  • 센서가 보정되지 않았습니다.
  • Strong magnetic interference.
  • Sensor movement during calibration.
  • Perform Acceleration and Magnetic Field Calibration.
  • Relocate sensor away from magnetic sources.
  • Ensure sensor is perfectly still during acceleration calibration.
Android app not detecting sensor.
  • Missing app permissions (Storage, Location).
  • Faulty OTG adapter or USB-TTL cable.
  • Phone not compatible with CH340 driver.
  • Grant all required app permissions.
  • Test with a different OTG adapter/cable.
  • Ensure your phone supports CH340 drivers for USB-serial communication.

11. 사양

특징 값
모델 HWT901B-TTL
Measurement Axes 9-axis (Accelerometer, Gyroscope, Magnetometer) + Air Pressure + Altitude
가속도계 범위 ±16g
Gyroscope Range ±2000°/초
Angle Accuracy (X, Y-axis) 0.05°
자력계 RM3100 (compensated)
출력 속도 0.2-200Hz (selectable)
인터페이스 TTL 시리얼
프로세서 32비트
패키지 크기 6.1 x 6.02 x 2.05 인치
무게 5.75 온스

Video Guide: Temperature Aging Test

This video demonstrates the temperature aging test process, ensuring stable accuracy across the sensor's operating temperature range.

Video Guide: High-Precision Turntable Calibration

This video shows the high-precision turntable calibration process performed before packaging, ensuring the sensor's accuracy.

12. 보증 및 지원

WITMOTION provides comprehensive support for its products:

  • 보증: The HWT901B-TTL comes with a 12-month warranty.
  • 고객 서비스: Lifetime friendly customer service is available from the WitMotion team.
  • 선적 서류 비치: For complete tutorials, software, and instructions, visit 위트모션닷컴 and navigate to the support page or the WITMOTION Google Drive.
  • 비디오 리소스: Find instructional videos and project sharing on the official WITMOTION Youtube channel.
  • 연락하다: For any assistance, contact support at support@wit-motion.com.

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