WitMotion HWT905 Accelerometer + Inclinometer (AHRS), IP67, RS232/RS485/CAN, 0.2–200 Hz

Overview

The WitMotion HWT905 Accelerometer + Inclinometer is a robust AHRS module that fuses a temperature-compensated SCA3300 MEMS accelerometer, gyroscope, and a PNI RM3100 geomagnetic sensor. With a Kalman-based fusion algorithm, 32-bit MCU (up to 168 MHz), and IP67 aluminum casing, it provides drift-free roll & pitch and true north-referenced yaw with superior yaw accuracy of 1° (after calibration). Outputs include 3-axis acceleration, angular velocity, magnetic field, Euler angle, quaternion, device time, and more. The sensor supports TTL/RS232/RS485/CAN and an adjustable 0.2–200 Hz data rate, with companion Windows software and an Android app for configuration, recording, and TXT export.

Key Features

• High-accuracy attitude sensing: roll/pitch static 0.05°, dynamic 0.1°; yaw 1° (after calibration & mag compensation).

• Industrial magnetometer: PNI RM3100 with magnetic-field compensation and disturbance recovery.

• Temperature compensation: SCA3300 accelerometer ensures stable output across varying temperatures.

• Fusion algorithm: dynamic fusion + Kalman filtering for low noise and excellent bias stability.

• Rugged, sealed design: IP67 waterproof, dust-resistant, anti-corrosion aluminum casing.

• Flexible interfaces: TTL / RS232 / RS485 / CAN; baud 4,800–921,600 bps.

• Adjustable output rate: 0.2–200 Hz.

• Developer-friendly: Windows configuration/visualization software, Android app, drivers, sample code (51 serial/C/C++/STM32/Arduino/Matlab), manuals & demos.

• Compliance: calibration report, IP rating, CE, ISO 9001 (shown).

Technical Specifications

Software & Tools

• Windows PC utility (MiniIMU.exe): live graphs for Acceleration, Angular Velocity, Angle, Magnetic Field; data recording & TXT export.

• Android App: configuration, calibration (accel/gyro/mag), algorithm selection, orientation setup, recording & TXT export.

• Development kits: manuals/datasheets, CH340 & CP2102 drivers, demo videos, example code for 51 serial, C/C++, STM32, Arduino, Matlab.

How It Achieves Stability

• Temperature Compensation (SCA3300) → accurate attitude in unstable temperatures.

• Magnetometer Compensation (RM3100) → high-resolution magnetic data with disturbance recovery.

• Core Fusion (Kalman + motion dynamics) → precise, low-noise attitude estimation.

Typical Applications

Industrial and mobile robotics, AGV/AMR navigation, platform leveling, antenna/solar tracking, vehicle attitude logging, marine/USV stabilization, surveying instruments, and motion analysis where sealed, wide-voltage AHRS is required.

Notes on Accuracy

Stated accuracies (e.g., yaw 1°) are achieved after calibration and with magnetic compensation in non-disturbed environments. Installation alignment and soft-/hard-iron calibration significantly affect yaw results.

Details

Military-grade HWT905 AHRS offers 1deg yaw accuracy. Features 3-axis acceleration, gyro, angle, magnetic field, and quaternion. Combines temp-compensated accelerometer with magnetic-rejecting magnetometer for reliable data in harsh environments.

The WitMotion HWT905 AHRS uses a SCA3300 MEMS sensor for accurate, temperature-compensated attitude data. It includes a high-resolution, magnet-compensated magnetometer and uses a Kalman filter-based fusion algorithm for precision. A 32-bit MCU processor running up to 168MHz enables fast data processing. The device is IP67 rated, offering protection against dust and water. Its durable aluminum housing resists rust and corrosion, making it suitable for harsh environments.

WitMotion HWT905 AHRS uses SCA3300 chip for temperature compensation, maintaining accurate attitude data in varying temperatures.

WitMotion HWT905 AHRS includes a military-grade RM3100 magnetometer and uses Kalman filtering for precise, stable, low-noise motion estimation.

WitMotion HWT905 AHRS offers calibration, IP-rating, CE, and ISO:9001. Uses aerospace algorithms with Kalman filtering. High accuracy: 0.05° static, 0.1° dynamic (X/Y-axis), 1° (Z-axis).

32-bit processor up to 168MHz enables fast data processing. IP67 waterproof aluminum casing offers anti-rust protection, ideal for harsh environments. Special screw design allows easy mounting and alignment.

WitMotion HWT905 AHRS for IoT, environmental monitoring, robotics, energy, maritime, and industrial automation applications.

Free PC software for WitMotion HWT905 AHRS enables easy setup with CH340 driver, PIN wiring, and MinIMU.exe. Offers configurable sensor settings including calibration, output frequency, bandwidth, and data content selection.

WitMotion HWT905 AHRS offers real-time data measurement with acceleration, angular velocity, angle, and magnetic field graphs. It supports powerful data storage and export to TXT files for Excel analysis, ensuring rock-solid data collection and convenient application.

3D Demo: Visualize sensor motion with car, helmet, cube, and drone models. Source code available. Android App: HWT905-TTL connects via serial to Android phones for real-time angle and graph display. USB-C adapter not included. Device has red and gold "INCLINOMETER" label with orientation indicators.

Android app for WitMotion sensor configuration, offering module selection, system settings, data recording, and export to TXT format. Real-time graphs display angle, acceleration, and magnetic data with calibration options.

Development Kits include manual, datasheet, Windows software, serial drivers, sample code for STM32, Arduino, C++, and Matlab. Files: PDFs, drivers, demo videos, PC software, and Android app.

WitMotion HWT905 AHRS uses SCA3300 and PNI RM3100 chips, supports TTL/RS232/RS485/CAN, provides 3-axis data, ±16g acceleration, ±2000°/s gyro, 1mg magnetic sensing, in a 55×36.8×24mm body with 1-meter cable.

The WitMotion HWT905 AHRS dimensions are 55mm x 47.9mm x 36.8mm, with a 24.2mm diameter mounting hole. It supports TTL and RS232 interfaces. Pin definitions: red (VCC: 5V or 5–36V), yellow (TX), green (RX), black (GND). Connection diagrams show interfacing with a laptop using a USB-TTL converter or RS232 serial port, indicating correct wiring for power and data transmission.

Pin definitions for the WitMotion HWT905 AHRS show RS485 using red (VCC 5–36V), yellow (A), green (B), and black (GND). The CAN interface has red (VCC 5–24V), yellow (CANH), green (CANL), and black (GND). MCU connections include VCC, TX, RX, and GND pins for microcontroller linking. Color-coded wires connect sensor outputs to matching power, signal, and ground lines, ensuring reliable communication and power supply across interfaces.

PC software	https://drive.google.com/drive/folders/1TLutidDBd_tDg5aTXgjvkz63OVt5_8ZZ?usp=drive_link
Android APP	https://drive.google.com/drive/folders/1jNwHD47YgpuH7_M4SjjOO8izGwTUzQ4L?usp=drive_link
Sample codes	https://github.com/WITMOTION
SDK/Protocol	https://support-73.gitbook.io/witmotion-sdk/