• The WitMotion WT901C-485 is a 9-axis IMU with RS485/RS232/TTL interfaces, offering 0.05° accuracy and 0.2–200 Hz AHRS functionality.
  • The WitMotion WT901C-485 is a 9-axis IMU with RS485/RS232/TTL interfaces, offering 0.05° accuracy and 0.2–200 Hz AHRS functionality.
  • The WitMotion WT901C-485 9-axis IMU provides 0.05° accuracy, 0.2–200 Hz AHRS, and RS485/RS232/TTL interfaces, with included certificate and QR codes.
  • The WitMotion WT901C-485 is a high-precision 9-axis IMU with 0.05° accuracy, supporting RS485/RS232/TTL and real-time data display.
  • Miniature 9-axis IMU with 0.05° accuracy, supports RS485/RS232/TTL, compact size 36.1×31.5×3mm, easy to mount with GND, VCC, A, B pins and XYZ axes.
  • The WitMotion WT901C-485 is a 9-axis IMU with ICM-42605 and AK8963 chips, offering RS485 Modbus interface, 200Hz output rate, 0.05° accuracy, and various sensor ranges.
  • The WitMotion WT901C-485 is a 9-axis IMU with 0.05° accuracy, supports RS485/RS232/TTL, uses an XH2.54-4P connector, and measures 36x51.3x15mm.
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WitMotion WT901C-485 9-Axis IMU Accelerometer Gyroscope Digital Compass (RS485/RS232/TTL), 0.05° Angle Accuracy, 0.2–200 Hz AHRS

WitMotion WT901C-485 9-Axis IMU Accelerometer Gyroscope Digital Compass (RS485/RS232/TTL), 0.05° Angle Accuracy, 0.2–200 Hz AHRS

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$49.00 USD
$49.00 USD
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Overview

The WitMotion WT901C-485 is a compact 9-axis AHRS IMU based on a triaxial MPU9250-class sensor suite (accelerometer + gyroscope + magnetometer) and WitMotion’s fusion/Kalman algorithm. It delivers angle, acceleration, angular velocity, magnetic field, and quaternion outputs with XY static accuracy 0.05° (dynamic 0.1°) and 0.2–200 Hz adjustable update rate. Multiple physical interfaces (RS485/RS232 Modbus & TTL UART) and wide input ranges make the WT901C-485 easy to integrate with Arduino/STM32/MCUs, PCs, and industrial controllers. Official Windows software (MiniIMU.exe) provides real-time graphs, 3D demo, data logging/export, and visual magnetic calibration.

Key features

  • 9-axis outputs: angle (Roll/Pitch/Yaw), 3-axis acc/gyro/mag, quaternion.

  • High stability & accuracy: XY 0.05° static, 0.1° dynamic; acceleration stability 0.01 g.

  • Flexible I/O: TTL / RS232 / RS485 (Modbus); baud 4,800–230,400 (default 9,600).

  • Adjustable rate: 0.2–200 Hz (default 10 Hz).

  • Wide supply: TTL 3.3–5 V, RS232/RS485 5–36 V; <25 mA typical.

  • Tooling & SDKs: Windows app, Android app, CH340/CP2102 drivers, sample code for C/C++/STM32/Arduino/Matlab.

  • Magnetic calibration & 3D demo for first-time setup; live plots and TXT export.

  • Industrial design: –40~85 °C, 51×36×15 mm, vertical or horizontal mounting.

Technical specifications

Item Spec
Model WT901C (WT901C-485 variant)
Interfaces TTL / RS232 / RS485 (Modbus)
Input voltage TTL: 3.3–5 V; RS232/RS485: 5–36 V
Current < 25 mA
Output data Acceleration, angular velocity, magnetic field, angle, quaternion
Measuring ranges Acc ±16 g, Gyro ±2000 °/s; Angle: X,Z ±180°, Y 90°
Resolution Acc 0.0005 g, Gyro 0.61 °/s
Stability Acceleration 0.01 g
Angle accuracy XY static 0.05°, dynamic 0.1°
Output frequency 0.2–200 Hz (default 10 Hz)
Baud rate 4,800–230,400 (default 9,600)
Size / weight 51×36×15 mm, 20 g
Operating temp –40 ~ 85 °C
Axes Cartesian, right-hand rule
Installation Vertical or horizontal

Angle frame (0x55 0x53) – output protocol

Byte index Content Meaning
0 0x55 Packet header
1 0x53 “Angle” frame ID
2–3 RollL/RollH X-axis angle (low/high)
4–5 PitchL/PitchH Y-axis angle (low/high)
6–7 YawL/YawH Z-axis angle (low/high)
8 VL Firmware version low
9 VH Firmware version high
10 Sum Checksum

Angle decoding
Roll (°) = ((RollH << 8) | RollL) / 32768 × 180
Pitch (°) = ((PitchH << 8) | PitchL) / 32768 × 180
Yaw (°) = ((YawH << 8) | YawL) / 32768 × 180

Checksum
Sum = 0x55 + 0x53 + RollL + RollH + PitchL + PitchH + YawL + YawH + VL + VH.
(Acceleration and angular-velocity frames follow the same layout style—see manual.)

Dimensions & Connector

Enclosure size: 51 × 36 × 15 mm (H × W × D), with mounting ears; weight ≈ 20 g.
Connector: XH2.54-4P (board header on the sensor).

Pinout (TTL version)

Pin Name Description
1 VCC Power input 3.3–5 V
2 TX Serial data input, TTL level
3 RX Serial data output, TTL level
4 GND Ground

Notes: Use TTL levels for direct MCU integration. RS232/RS485 variants use their respective voltage levels and wiring standards.

 

Software & tools

  • MiniIMU.exe (Windows): configuration (algorithm, install direction, ranges, bandwidth), real-time graphs, raw/hex view, data recording and TXT export.

  • 3D demo: visualize orientation in real time (source available).

  • Visual magnetic calibration: ellipse-fit wizard to remove bias (recommended for first use).

  • Drivers & code: CH340/CP2102 drivers; examples for STM32, Arduino, C/C++, Matlab; Android app; PC/phone demo videos.

Typical applications

Automation and robotics, leveling platforms, tilt-angle monitoring, vibration monitoring, consumer electronics, IoT system integration, industrial testing, VR/AR headsets.

Details

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