Overview
The WitMotion WT901B AHRS (MPU9250) integrates a 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer, and a barometer to deliver angle, acceleration, angular velocity, magnetic field, air pressure and height. A 48 MHz MCU with LDO regulation and an in-house fusion + Kalman filter algorithm provides low-noise, stable outputs for robotics, structural monitoring, mobile machinery, and VR/consumer devices.
Key Features
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10-axis IMU + barometer with altitude calculation (relative accuracy ±0.06 hPa)
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Angle precision: X/Y 0.05° (static), 0.1° (dynamic); Yaw 1° (calibrated, low interference)
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Configurable output 0.2–200 Hz; start-up ≈ 1000 ms
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Interfaces: UART (4800–230400 bps), I²C (open-drain; needs 4.7 kΩ pull-ups)
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Supply 3.3–5.5 V, typical 12 mA @5 V, sleep 15 µA
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Rugged: −40–85 °C operating, 20,000 g shock resistance
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Free Windows software (real-time curves, logging to TXT), visual magnetic calibration, 3D demo (source available on request)
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Certifications: Calibration report, RoHS, CE, ISO9001
Roll/Pitch Angle Specifications
| Parameter | Condition | Typical |
|---|---|---|
| Range | — | X: ±180°, Y: ±90° |
| Inclination | Static / Dynamic | 0.1° / 0.5° |
| Resolution | Horizontal | 0.0055° |
| Temp Drift | −40–85 °C | ±0.5–1° |
Heading (Yaw) Specifications
| Item | Condition | Typical |
|---|---|---|
| Range | — | Z: ±180° |
| Resolution | Horizontal | 0.0055° |
| Accuracy | 9-axis (dynamic/static) | 1° (calibrated, away from interference) |
| 6-axis (static) | 0.5° integral cumulative error |
Sensor Technical Specs
Accelerometer
| Range | Resolution | RMS Noise (100 Hz) | Static Drift | Temp Drift | Bandwidth |
|---|---|---|---|---|---|
| ±16 g | 0.0005 g/LSB | 0.75–1 mg-rms | ±20–40 mg | ±0.15 mg/°C | 5–256 Hz |
Gyroscope
| Range | Resolution | RMS Noise (100 Hz) | Static Drift | Temp Drift | Bandwidth |
|---|---|---|---|---|---|
| ±2000 °/s | 0.061 (°/s)/LSB | 0.028–0.07 (°/s)-rms | ±0.5–1 °/s | ±0.005–0.015 (°/s)/°C | 5–256 Hz |
Magnetometer & Barometer
| Magnetometer Range | Magnetometer Resolution | Barometer Range | RMS Noise | Relative Accuracy |
|---|---|---|---|---|
| ±2 Gauss | 0.0667 mGauss/LSB | 300–1100 hPa | 0.5 Pa-RMS | ±0.06 hPa |
Module & Electrical
| Item | Min | Default | Max |
|---|---|---|---|
| Output Rate | 0.2 Hz | 10 Hz | 200 Hz |
| Input Voltage | 3.3 V | 5 V | 5.5 V |
| Operating Current (5 V) | — | 12 mA | — |
| Sleep Current (5 V) | — | 15 µA | — |
| Operating Temp | −40 °C | — | 85 °C |
| Storage Temp | −40 °C | — | 100 °C |
Dimensions & Pinout
Size (mm): A 15.24 × B 15.24 × C 2.54 × D 12.7 × E 2
Axes: X→right, Y→up, Z→out of PCB (right-hand rule)
Pins (1–12):
D0, VCC(3.3–5 V), RX(TTL in), TX(TTL out), GND, D1(GPS support), D2(X+ alarm/reset), VCC, SCL(Y+ alarm), SDA(Y− alarm), GND, D3(X− alarm)
Connectivity & Tools
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UART TX↔RX cross-connect to MCU
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I²C with 4.7 kΩ pull-ups on SCL/SDA
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External GPS (NMEA-0183) wiring to build GPS-IMU navigation (outputs latitude/longitude, altitude, heading, speed, displacement)
Software & Dev Kits
Windows PC suite for configuration, calibration (accel/mag/angle/height), bandwidth/rate selection, and raw/curve logging. Example resources for Matlab, Python, Raspberry Pi, STM32, ROS, Arduino, C/C#; CH340/CP2102 drivers; Android app; demo videos; Manual.pdf & Datasheet.pdf.
Applications
IoT sensing, environmental & bridge monitoring, robotics & automation, forklifts and mobile machinery, mining, consumer electronics, VR gadgets.
Details

Cost-Effective AHRS Barometer Provides High Accuracy for Z-Axis Angle, Inclination, and Air Pressure, Plus Acceleration, Gyro Angle, Magnetic Height, and Air Pressure Measurements.

WitMotion WT901B AHRS IMU includes accelerometer, gyroscope, magnetometer, and barometer. Offers ±16g, ±2000°/s, ±2 Gauss, 300-1100hPa. High resolution, low noise, wide bandwidth, temp stability -40°C to +85°C.

AHRS IMU WT901B offers ±180° roll/pitch/yaw, 0.0055° resolution, 1° accuracy, 9-axis algorithm, UART/IIC, 200Hz output, -40°C to 85°C temp range, 3.3V-5.5V input.

WT901B AHRS IMU has MEMS sensor, 48MHz MCU, LDO power chip, and gold-immersed copper interface. It provides ±0.06hPa pressure accuracy, stable fusion algorithm, and meets RoHS, CE, and ISO:9001 standards.

AHRS IMU WT901B uses WitMotion algorithm with Kalman filter for high angle accuracy. Suitable for IoT, VR, robotics, mining, bridges, and environmental monitoring.

AHRS IMU WT901B offers free, user-friendly software, plug-and-play test fixture, and configurable settings for calibration, output, and precise attitude measurement.

WT901B AHRS IMU offers real-time data measurement, powerful storage and export to TXT files, and intuitive 3D motion visualization. Features include acceleration, angular velocity, magnetic field data, and compass display for precise sensor monitoring.

AHRS IMU WT901B offers visual magnetic calibration, TTL/IIC MCU connections, GPS compatibility. Outputs latitude, longitude, altitude, heading, speed, displacement for navigation.

Development Kits include manual, datasheet, Windows software, CH340 & CP2102 drivers, sample code for Matlab, Python, Raspberry Pi, STM32, ROS, Arduino, C++/C#, and demo videos for Android and PC.

WT901B AHRS IMU undergoes rigorous testing: 3-axis turntable, 6 DOF vibration, extreme temperatures (80°C to -40°C), 72-hour aging, and high-temperature evaluations.

WT901B AHRS IMU dimensions: 15.24×15.24×2.54 mm, 12-pin layout with analog/digital I/O, UART, I2C, and alarm outputs. Axial directions defined by right-hand rule; X right, Y up, Z outward.

AHRS IMU WT901B from WITMotion includes sensor module, catalog, promo card with QR codes for docs and support.
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