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● (1) High Precision Military-grade Pitch Roll Yaw (X Y Z axis) Accelerometer + Angular Velocity + Angle +Magnet Field + Quaternion data output
● (2) Designed with advanced Kalman filters and 32-bits processor, ensure high stability and precision of 0.1-200HZ data output, dynamic angle measurement accuracy at 0.05 degree
● (3)In-built with military-grade RM3100 magnet field sensor, which barely affected by the magnetic field interference, can automatically correct the data output to the accurate value. There is few drift of Z-axis angle.
● (4) Equipped with IP67 waterproof and built-in accelerometer SCA300 chip make it more precise. Product motion attitude data output still remains accurate even in harsh environment.
● (5) BUY WITH CONFIRDENCE: R&D by WitMotion Team( 6-year Professional Attitude Measuring Solution Provider), Lifetime Technical Support: (Email: kyle@wit-motion.com, Mob/Whatsapp: +86 13652339539), Providing PC software, mobile phone APP, and 51 serial, STM32, Arduino, and Matlab sample code
Specification
Highlights
HWT905’s scientific name is AHRS IMU sensor. A sensor measures 3-axis angle, angular velocity, acceleration and magnetic field. HWT905 is employed where the highest measurement accuracy is required.
Its strength lies in the algorithm which can calculate three-axis angle accurately.
Robust MEMS designs and high performance in harsh environment
Ground breaking bias stability, low noise level and good vibration robustness
Persued for best data accuracy and stability: WTMOTION patented zero-bias automatic detection calibration algorithm and R&D dynamic fusion algorithm outperforms traditional accelerometer sensor
Technical Specifications:
Current: <40mA
Voltage: 3.3-5V (requiring a power source of 3.3-5V)
Data output frequency：0.2-200Hz
Baud Rate: 4800-961200 (adjustable)
Working Temperature: -40℃ ~ +85℃
Output Content: 3-axis Acceleration+Angle+Angular Velocity+Magnetic Field+Quaternion
Range: Acceleration (±6g), Gyroscope (±2000°/s), Magnet Field (±4900µT), Angle (X, Z-axis: ±180°, Y ±90°)
Resolution: Acceleration (0.005g), Gyroscope (0.61°/s), Magnet Field (16 bits)
Angle Accuracy(after calibrated): X, Y-axis: 0.05° (Static) , X, Y-axis: 0.1° (Dynamic)
Note: Z-axis angle will be affected by magnetic field. It is required to calibrate and keep the sensor at least 20cm away from the stuff like metal that may create magnetic field interference.
SCA3300 Temperature Compensation
Embedded highly-integrated Murata SCA3300 MEMS accelerometer
● Excellent bias stability, low noise level and linearity
● Unique mechanical over damping ensuring high performance in harsh environment
RM3100 Magnetometer Compensation Chip
In-built military-grade PNI RM3100 geomagnetic sensor, measurements are stable over temperature and inherently free from offset drift.
● high resolution, low power consumption
● accurate calculation of heading and orientation
32-bit MCU Processor
Built-in low-power 32 Bits core processor
● high-performance reaching 168MHZ
● faster in data processing
WITMOTION Alrogithm Advantages
WITMOTION products are derived from the aerospace Satellite Attitude Determination Algorithm.
Built-in core algorithm:
● R&D Dynamic Fusion Algorithm
● Kalman filtering (program filter)
● Digital filtering
● State estimation algorithm
Time and energy saving: No need to study the complicated protocol of MPU6050/ 9250 to analyze the attitude angle.
Premium Casing and Cable
● Casing Size: 55*36.8*24mm / 2.165*1.14*0.95"
● Robust aluminum casing
● IP67 Waterproof
● Dust-resistant
● Premium cable (1 meter)
Certification
● HWT905 is CE certified, meets EU standards for health, safety, and environmental protection
● WitMotion Shenzhen Co.,Ltd is in conformity with Quality Management System Standard: GB/T19001-2016 idt ISO9001:2015.
Tutorial
● Manual & Datasheet
● Free software for Windows PC (Minimu.exe)
● APP for Android phone
● Instruction video (search WITMOTION on Youtube)
● CH340 & CP2102 serial Drivers
● Sample code including 51 serial, C+, STM32, Arduino, and Matlab
Packing List
1 x HWT905-TTL inclinometer
● 1 x 3-in-1 UART converter
● 1x Instruction card printed with QR code of document center
Our Promise:
● 30 days return refund policy for any quality issue
● Quality secured, 100% inspected & tested at factory before shipping
● Remote diagnostics and lifetime technical support by Witmotion engineering team
Free & Genuinely Useful Software
Compared with traditional sensor’s simplied serial software, WITMOTION software offers several advantages over competing sensor:
● configurations setting
● dashboard, 3D DEMO, data curve & chart display in real-time
● data record and playback, raw data reviewing, and more
Notice: There is no software for the Linux, Python, or Mac system at present. Witmotion software is provided as free, compatible with the Windows system only, including Win 10, 8, 7, XP.
PC software for Windows
3D Display
Data Curve Display
Configuration
About WITMOTION
Established in 2014, WitMotion Shenzhen Co.,Ltd aims to become a global leader in attitude sensor, AHRS IMU. Foud out more here in our Witmotion Brand Store on Amazon.
The company is dedicated to make attitude measurement and tilt angle sensing solutions more accessible and easier for engineers around the world. Widely used every day by customers in over 50 countries for energy and electric power, tower control, Monitoring, engineering machinery, medical, academic, integrated system, more developing projects.
WITMOTION' s R&D Dept.
● 20+professional engineer industry's top R&D team, and has a long-term collaboration with the Beihang University PhD team.
● WitMotion R&D protocol and Dynamic Fusion Algorithm
● over 50+ patents and software program
Research and Development Facilities:
● World's top-level of triaxial nonmagnetic turntable: All finished items will be calibrated through the turntable, ensuring the X Y Z angle's accuracy.
● High& low temperature test chamber, making sure that the sensor can actually work well under -40℃ ~ +85℃ environment
● Vector Network Analyzers(VNA): Bluetooth antenna impedance matching
● 6 degrees of freedom vibration test bench: sensor's high performance and stability secured under vibration and dynamic environment
Premium Components & QC System: All components are selected and certified under a strict quality control system from the procurement, manufacturing process to assembly, inspection.
Automatic Production&Assemble line of Factory:
Automatic Solder Paste Printing, Imported Placement Machine, Multi-temperature Reflow Soldering, Fully Automatic Inspection
 Military-grade HWT905-TTL Tilt Angle Sensor |  Military-grade HWT905-RS232 Inclinometer |  Military-grade HWT905-RS485 Magnetometer |  Military-grade HWT901B-TTL Accelerometer |  Industrial-grade SINDT-RS485 Inclinometer |  WTGAHRS2 GPS IMU | |
| Interface | TTL | RS232 | RS485 Modbus RTU | TTL | RS485 Modbus RTU | TTL |
| Compatibility | Windows PC, Android phone, MCU Arduino, Raspberry pi, etc | Windows PC, PLC system, MCU Arduino, Raspberry pi, etc. | Windows PC, PLC system, MCU Arduino, Raspberry pi, etc. | Windows PC, Android phone, MCU Arduino, Raspberry pi, etc | Windows PC, PLC system, MCU Arduino, Raspberry pi, etc. | Windows PC, Android phone, MCU Arduino, Raspberry pi, etc |
| Input Voltage | 3.3-5V | 9-36V | 9-36V | 3.3-5V | 9-36V | 3.3-5V |
| 3-Axis Acceleration | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3-Axis Angular velocity (Gyroscope) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3-Axis Angle | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| 3-Axis Magnetic Field | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Output Frequency | 0.2HZ--200HZ | 0.2HZ--200HZ | RS485 Modbus RTU | 0.2HZ--200HZ | RS485 Modbus RTU | 0.2HZ--200HZ |
| Housing | Aluminum case, IP67 waterproof | Aluminum case, IP67 waterproof | Aluminum case, IP67 waterproof | Aluminum case | Aluminum case, IP67 waterproof | Plastic case |
| Main Features | Military-Grade Accuracy, RM3100 magnetometer& SCA3300 temp compensation | Military-Grade Accuracy, RM3100 magnetometer& SCA3300 temp compensation | Military-Grade Accuracy, RM3100 magnetometer& SCA3300 temp compensation, support 128 units multiple-connection | Military-Grade Accuracy, RM3100 magnetometer compensation | Dual-axis tilt angle measurement, support 128 units multiple-connection | Chinese Beidou navigation system+ GPS, High-stability IMU sensor |
Download Center
Complete Tutorial
Video
Instruction Demo
HWT905 Inclinometer Use Instructions with PC
HWT905 Use Instructions with Android Smartphone
Reviews
Josignature
This accelerometer works as info provided by manufacturer. Really easy to setup and it has excellent sensitivity and performance. The only thing doesn't work is when you try to run a data file saved or try to convert this data; but it save data in txt format and you can manipulate it whatever you want!
Ted
Edit:
Tech support did get back to me (the listed tech support e-mail is no
longer monitored). The issue, according to tech support, is that the
HT905 that was sold requires 9-36V input. If you see "RS232" on the
back, that is what it implies. They indicated they will exchange it at
no cost, through Amazon, for the one I want. I wish the item listing
would present the specifications more precisely upfront.
The
device seemed to be solid construction & I was looking forward to
using a robust outdoor IMU for our project. I would say the
documentation on their website is 'fair' (maybe 2-3 -stars); the
software utilities work differently than described in the documentation.
However, after unpackaging I noticed that the cable strain grommet
mount on the IMU case side appears to be 'crooked'. I tried the sensor
with their recommended RS232-TLL USB converter device. I could never get
any interpretable data from it on any platform, with or without their
software that can be downloaded for the device. I e-mailed them a couple
times for help and never got any response (they are not in US). I am
wondering if it was even tested in the factory before shipping. I wish I
could return it. I would stay away from these, or similar products from
WIT-MOTION since I'm not convinced there is good QC for these
particular sensors. Because of these issues I give it 1 'star'.
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