Overview
WitMotion WT901SDCL-BT50 is a compact9-axis IMU data logger that integrates a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer with an onboard attitude solver. It supports quaternion and 3-axis angle outputs, 16 GB SD-card offline recording, and Bluetooth 5.0 (BLE) for remote file reading and live streaming. WitMotions Kalman-fusion algorithm delivers high stability with angle accuracy X/Y 0.2, Z 1 (after calibration). A free PC program and mobile app provide 3D motion visualization and curve plotting.
Key Features
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Accelerometer with SD card and Bluetooth: 16 GB onboard logging + BLE remote file access; USB-C U-disk simulation (no card removal).
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BLE 5.0 wireless link up to ~90 m in open space; ultra-low power (~10 mA typical, ~30 A sleep).
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Rich outputs: acceleration, angular velocity, magnetic field, 3-axis angle, quaternion, timestamp (and temperature).
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Configurable output 0.1200 Hz; sensor bandwidth 5256 Hz.
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High-precision 3D magnetometer and digital filtering for low noise and strong anti-interference.
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Free PC software & mobile app: live graphs, data lists, configuration, and switchable 3D pose models.
Basic Information
| Item | Value |
|---|---|
| Model | WT901SDCL-BT50 |
| Sensors | 3-axis accelerometer + 3-axis gyroscope + 3-axis magnetometer |
| Algorithm | WitMotion attitude solver + Kalman fusion |
| Outputs | Acceleration, angular velocity, magnetic field, 3-axis angle, quaternion, timestamp (and temperature) |
| Sample/Output Rate | 0.1200 Hz (configurable) |
| Storage/Comms | 16 GB SD-card offline logging; USB-C U-disk mode; Bluetooth 5.0 remote file read |
Accelerometer
| Parameter | Condition | Typical Value |
|---|---|---|
| Range | 2/4/8/16 g (optional) | |
| Resolution | 0.5 mg/LSB (0.0005 g/LSB) | |
| RMS Noise | Bandwidth = 100 Hz | 0.751 mg-rms |
| Static Zero Drift | Placed horizontally | 2040 mg |
| Temperature Drift | 0.15 mg/C | |
| Bandwidth | 5256 Hz |
Gyroscope
| Parameter | Condition | Typical Value |
|---|---|---|
| Range | 2000 /s | |
| Resolution | @ 2000 /s | 0.061 (/s)/LSB |
| RMS Noise | Bandwidth = 100 Hz | 0.0280.07 (/s)-rms |
| Static Zero Drift | Placed horizontally | 0.51 /s |
| Temperature Drift | 0.0050.015 (/s)/C | |
| Bandwidth | 5256 Hz |
Magnetometer & Angle
| Parameter | Condition | Typical Value |
|---|---|---|
| Magnetic Field Range | 2 Gauss | |
| Magnetic Resolution | 0.0667 mG/LSB | |
| Angle Range | X/Z 180, Y 90 | |
| Angle Resolution | 0.0055/LSB | |
| Angle Accuracy | After calibration, away from magnetic interference | X/Y: 0.2, Z: 1 |
Electrical & Interface
| Item | Value |
|---|---|
| Power | 5 V USB-C, built-in 200 mAh battery |
| Operating Current | < 10 mA (sleep ~ 3050 A) |
| Interfaces | USB-C, Bluetooth 5.0 (BLE), open-space range up to ~90 m |
| Baud Rate | Adaptive, up to 2 Mbit/s |
| Output Frequency | 0.1200 Hz (configurable) |
| Logging | 16 GB SD card, Bluetooth remote file read; USB-C U-disk simulation |
| Typical Runtime | ~10 hours |
Mechanical
| Item | Value |
|---|---|
| Dimensions | 51.5 36.1 15 mm (body height ~42.8 mm) |
| Mounting | Integrated side tabs for easy fastening |
Applications
Robotics posture sensing, UAV/UGV navigation, vehicle dynamics testing, motion capture, platform leveling, and inertial logging where Bluetooth access and low power are required.
Details
Bluetooth IMU Recorder with 16G SD card offline recording and remote file access, featuring 3-axis ACC, Gyro, Angle, Mag, Quaternion, and Kalman Filter.
BLE Logger offers multi-axis acceleration, angular data, digital filtering, comprehensive outputs, Bluetooth connectivity, customizable settings, and remote data access. Other sensors provide limited static data, no angle output, lack remote capability, fixed configuration, and require card readers.
WitMotion WT901SDCL-BT50 accelerometer logger includes 200mAh battery, 5V Type-C USB, Bluetooth, 3-axis sensing, 16g acceleration, 2000/s velocity, 2Gauss magnetism, 10-hour usage, and measures 51.536.115mm.
Bluetooth 5.0 chip offers fast response, low latency, strong interference immunity, 90m range, and ultra-low power consumption of 10mA (30uA in sleep).
High Precision Magnetometer with 3D magnetic sensing, low power, high resolution, and anti-noise capability.
WitMotion Algorithm X Kalman Filtering collects raw data from gyroscope, accelerometer, and magnetometer chips. The angle is calculated using Kalman filtering and WitMotion algorithms. Angle accuracy is XY 0.2, Z 1 when away from magnetic interference and calibrated. The graph displays angular data over time, with blue, red, and yellow lines representing different axes or filtered outputs. Timestamps range from 15:21:09.210 to 15:21:15.223. The chart illustrates the stability and precision of the algorithm in processing motion data, highlighting fluctuations and corrections in real-time orientation measurements.
Simulate U Disk Function via Type-C Cable, No SD Card Needed
WitMotion offers free PC software and app for WT901 accelerometer logger. Features include 3D motion visualization with four models, real-time angle data display, and curve tracking for sensor movement analysis.
Software interface shows real-time sensor data: acceleration, angular velocity, angle, magnetic field, pressure, GPS. Configurable settings enable setup, calibration, logging. MATLAB imports data for analysis with graphs of acceleration, angle, and temperature over time.
Visual magnetic field calibration before and after, SD card capacity 16GB, long-term recording up to 11M files. Files listed include SET.TXT and WIT series data logs with timestamps and sizes.
Automatically generate parameter configuration files without software operation. Adjust parameters for effect: DataNum=128, File Size=10000, Direction=0, Acc Range=3, Gyro Range=3, Band Width=4, Rate=11.
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