WitMotion WT901BLECL 9-Axis Bluetooth 5.0 IMU – Accelerometer + Gyro + Magnetometer for Arduino, Kalman Filter, Android/iOS/PC

Overview

WitMotion WT901BLECL is a compact 9-axis MEMS IMU that fuses a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer with an onboard attitude solver and Kalman filtering. It streams acceleration, angular velocity, magnetic field, Euler angles, and quaternions over BLE 5.0 or via USB-UART (115200 bps). Typical specs shown in the product materials include ±16 g accel, ±2000 °/s gyro, angle accuracy to 0.05° (static) / 0.1° (dynamic), 0.2–50 Hz output (10 Hz default), and up to ~50 m open-area BLE range. The module is paired with free Android/iOS apps and Windows PC software for live plots, 3D model, logging, and calibration.

Key Features

• 9-axis sensor fusion: Acc, Gyro, Mag with quaternion & 3-axis angle output.

• Kalman-filtered attitude solver: Reduces gyro-integration drift versus 6-axis only algorithms; stable, low-noise data.

• BLE 5.0 + USB-UART: Wireless streaming to phones/tablets; 115200 bps wired connection to PCs or embedded hosts.

• Free apps & PC tools: One-click configuration, real-time curves/3D DEMO, data recording/playback, RAW data review.

• Multi-device support: Android app can view up to 4 sensors simultaneously.

• Easy calibration: Accelerometer & magnetometer calibration, auto-gyro calibration, placement/orientation selection, output-rate & bandwidth settings.

• Certifications shown: TELEC, FCC, CE, ISO 9001 (as pictured).

Technical Specifications 

Accelerometer parameters

Parameters	Condition	Typical value
Measuring range		±16g
Resolution ratio	±16g	0.0005(g/LSB)
RMS noise	Bandwidth=100Hz	0.75~1mg-rms
Static zero drift	Place horizontally	±20~40mg
Temperature drift	-40°C ~ +85°C	±0.15mg/℃
Bandwidth		5~256Hz

Gyroscope parameters

Parameters	Condition	Typical value
Measuring range		±2000°/s
Resolution ratio	±2000°/s	0.061(°/s)/(LSB)
RMS noise	Bandwidth=100Hz	0.028~0.07(°/s)-rms
Static zero drift	Place horizontally	±0.5~1°/s
Temperature drift	-40°C ~ +85°C	±0.005~0.015 (°/s)/℃
Bandwidth		5~256Hz

Magnetometer parameters

parameters	Condition	Typical value
Measuring range		±2Gauss
Resolution ratio	±2Gauss	0.0667mGauss/LSB

Pitch and roll angle parameters

parameters	Condition	Typical value
Measuring range		X:±180°
		Y:±90°
Inclination accuracy		0.2°
Resolution ratio	Place horizontally	0.0055°
Temperature drift	-40°C ~ +85°C	±0.5~1°

Heading angle parameter

parameters	Condition	Typical value
Measuring range		Z:±180°
heading accuracy	9-axis algorithm, magnetic field calibration, dynamic/static	1°（Without interference from magnetic fields）【1】
	6-axis algorithm, static	0.5°（Dynamic integral cumulative error exists） 【2】
Resolution ratio	Place horizontally	0.0055°

Module parameters

Parameter	Condition	minimum value	Default	maximum value
Communication Interface	UART	115200bps	115200bps	115200bps
Output content		3-axis acceleration, 3-axis angular velocity, 3-axis magnetic field, 3-axis angle, quaternion, port status
Output rate		0.2Hz	10Hz	200Hz
Start Time				1000ms
Number of cascades	Bluetooth multi-link adapter			4pcs
Bluetooth transmission distance	open environment			50m
Operating temperature		-20℃		60℃
Storage temperature		-40℃		85℃
Shock proof				20000g

Note:【1】Please perform magnetic field calibration in the testing environment before use to ensure that the sensor is familiar with the magnetic field in the environment. During calibration, please stay away from magnetic interference. 

【2】In some vibration environments, there will be cumulative errors. The specific errors cannot be estimated and are subject to actual testing.

Hardware & Architecture 

• Built-in Bluetooth antenna for stable wireless transmission

• 168 MHz MCU for higher-rate fusion and reliable streaming

• Embedded MEMS sensor chip; protected power-supply IC for voltage stability

• 4-layer PCB for thinner, smaller, more reliable design

Software & SDK

• Android/iOS App: live graphs (A/W/Angle/Mag), configuration, recording, easy pairing.

• Windows PC software: 3D model, dashboards, real-time charts, data logging & playback, RAW data viewer, config menu.

• Developer resources: datasheet, manual, protocol docs, drivers (CH340/CP2102), multi-BLE utility, tutorial videos.

Typical Use Cases

Rehabilitation & sports motion tracking, workplace injury prevention, short-range wireless motion capture/measurement, UGV/IoT attitude sensing, mapping, and education/labs.

What’s in the Box

• WT901BLECL IMU

• USB Type-C cable

• Quick Start Guide
  (Contents based on the packaging visuals; actual kit may vary by seller batch.)

Details

Ultra-high accuracy MEMS IMU, ideal for IoT, environmental monitoring, UGV, energy, mapping, and building protection. Features 9-axis BLE 5.0 sensor with MPU9250 chip, 50Hz return rate, low-energy BLE, and 50m Bluetooth range. Includes 3-axis acceleration, gyroscope, angle, magnetometer, and quaternion data. Equipped with USB interface. Brand: WitMotion. Website: www.wit-motion.com.

WitMotion WT901 BLE IMU offers high-precision core algorithm, dynamic fusion, Kalman filtering. Supports state estimation, kinetic solution, digital/software filtering. Certified with TELEC, FCC, CE, ISO 9001.

WitMotion Algorithm with Kalman Filter ensures high angle accuracy. Bluetooth 5.0 offers 50m wireless range. Low-power design enables up to 10 hours battery life.

WitMotion WT901 BLE IMU offers an Android app for simple pairing and data viewing. It has a Bluetooth antenna, 168MHz MCU, MEMS sensor, and power chip for reliable motion data.

WitMotion WT901 BLE IMU supports multi-connection for up to 4 devices via Android app. Includes development kit with datasheets, manuals, drivers, software, and tutorial videos for easy setup and custom app integration.

WitMotion WT901 BLE IMU smartphone app enables easy sensor configuration via Android and iOS. Features include real-time data display, calibration, angle measurement, and log recording. Available on App Store and Google Play.

Free & Useful PC Software for WitMotion WT901 BLE IMU offers real-time 3D demo, data curve, and chart display. Features include data record and playback, raw data review, and configuration settings. Requires a BLE 5.0 adapter for pairing. Highlights: data record, 3D model visualization, data curve display, dashboard interface, configuration tools, and Windows compatibility. The software supports comprehensive sensor data monitoring and analysis with intuitive visualizations and user-friendly controls.

WitMotion WT901 BLE IMU software interface displays real-time sensor data including acceleration, angular velocity, magnetic field, and GPS. Features include 3D demo, data recording, playback, calibration, and configurable settings for output rate, bandwidth, and measurement range.

WitMotion WT901 BLE IMU offers real-time data measurement with motion visualization. Features include 3D demo for intuitive sensor state viewing, Bluetooth connectivity, and customizable data curves. Source code available upon request.

WitMotion WT901 BLE IMU dimensions: 51.5mm x 36.1mm x 15mm. Features 12-pin layout with digital I/O, power, UART, and I2C interfaces. Operating voltage 3.3V-5V. Includes size, pinout, and mechanical drawings.

WitMotion WT901 BLE IMU weighs 14g, operates at 3.3V-5V, and measures 3D acceleration, angular velocity, magnetic field, and angle. It supports 115200 baud rate, 50m BLE range, and is compatible with Android, iOS, and Windows devices.

WitMotion WT901 BLE IMU for rehabilitation, injury prevention, sports monitoring, and patient care. Features wireless motion measurement and attitude sensing technology.