The GMU200-BL is a cost-effective miniature AHRS attitude reference system built for equipment demanding superior dynamic balance performance, including model flight units, robots, agricultural machinery, engineering vehicles and forklifts. It acquires raw sensor data and applies a Kalman filter algorithm to output real-time attitude information. Combining a 3-axis accelerometer, 3-axis magnetometer and 3-axis gyroscope with embedded temperature compensation, it delivers reliable stability and fast response across the full attitude range for diverse dynamic attitude monitoring tasks. Beyond attitude angles, it outputs complete nine-axis data: 3-axis acceleration, 3-axis gyro and 3-axis magnetic field readings. Users can adjust and extend system operating parameters to match different host platforms.
It adopts Bluetooth wireless transmission with a Bluetooth 5.1 BLE module and 2.4GHz adaptive frequency hopping. It achieves a line-of-sight transmission distance of up to 40 meters in open, unobstructed conditions. BLE DFU wireless firmware update is supported, bringing greater flexibility for industrial on-site deployment.
Technical Characteristics
❖ Sensor: Integrated 9-axis sensor + temperature sensor
❖ Communication: Bluetooth 5.1 wireless transmission
❖ Operation Mode: Supports VRU and AHRS
❖ Function: Real-time 3D dynamic measurement
❖ Feature: Compact structure, easy installation
Application Field
❖ Medical rehabilitation equipment monitoring ❖ Limb rehabilitation monitoring
❖ Human body capture ❖ Posture angle monitoring

Performance Parameters
|
GMU200-BL |
Parameter |
|
Measurement Range |
Roll ±180°, Pitch ±90°, Azimuth ±180° (In VRU mode, the initial value after Bluetooth disconnection and reconnection is 0°; in AHRS mode, the output is the magnetic heading angle) |
|
Measurement Axis |
X Axis / Y Axis / Z Axis |
|
Roll and Pitch Static Accuracy 1) |
±0.1° (@25℃) |
|
Roll and Pitch Dynamic Accuracy (rms) |
±0.25° (@25℃) |
|
Magnetic Heading Accuracy (AHRS) |
±1.5° (@25℃) |
|
Gyroscope |
|
|
Gyroscope Range (Adjustable) |
±125°/s, ±250°/s, ±500°/s, ±1000°/s, ±2000°/s |
|
Zero-Bias Stability (10s Smoothing) |
10°/h |
|
Zero-Bias Instabilit(Allan) |
5°/h |
|
Angle Random Walk Coefficient(Allan) |
0.25°/sqrt(h) |
|
Accelerometer |
|
|
Acceleration Range (Settable) |
±2g, ±4g, ±8g, ±16g |
|
Bias Stability (10s Mean) |
0.1mg |
|
Bias Instability(Allan) |
0.05mg |
|
Velocity Random Walk Coefficient (Allan) |
0.005m/s/sqrt(h) |
|
Magnetometer |
|
|
Magnetometer range |
±8Gauss |
|
Resolution |
<2.5mgauss |
|
Bandwidth |
<100Hz |
|
Other |
|
|
Zero-point temperature coefficient 2) |
±0.01°/℃ (@-20~65℃) |
|
Sensitivity temperature coefficient 3) |
≤100ppm/℃ (@-20~65℃) |
|
Power-on time |
≤3.5S |
|
Response time |
0.01S |
|
Electromagnetic compatibility |
According to EN61000 and GBT17626 |
|
Receiver sensitivity |
-96dBm |
|
Transmit power |
8dBm |
|
Bluetooth transmission distance |
40m (in an open, unobstructed area) |
|
Usage time (fully charged battery) |
Continuous operation for 6 hours,standby time for 83 days |
|
Insulation resistance |
≥100 megohms |
|
Shock resistance |
100g@11ms, triaxial (half-sine wave) |
|
Vibration resistance |
10grms , 10~1000Hz |
|
Casing material |
ABS plastic housing |
|
Weight |
≤20g |
|
1) Accuracy: Refers to the root mean square difference between the measured value and the actual angle error after multiple angle measurements (>16 times) under normal temperature conditions. |
|
Battery Parameters
|
Item |
Parameter |
|
Nominal Capacity |
100mAh |
|
Nominal Voltage |
3.7V |
|
Charging Cut-off Voltage |
4.20 |
Electrical Parameters
|
Parameters |
Condition |
MIN |
TYP |
MAX |
Unit |
|
Charging Voltage (DC) |
Standard |
4.5V |
5V |
5.5 |
V |
|
Charging Current |
|
|
0.1 |
|
A |
|
Charging Temperature |
0~+55℃ (Note: Charging temperatures that are too high or too low can damage the battery) |
|
|||
|
Charging Interface |
Type-C interface |
|
|||
|
Charging Time |
2.5 hours(25℃) |
|
|||
|
Operating Current |
|
|
18 |
|
mA |
|
Power Off and Sleep Current |
|
|
50 |
|
uA |
|
Operating Temp |
|
-20 |
|
+70 |
℃ |
|
Storage Temp |
|
-20 |
|
+70 |
℃ |
Product Dimensions
Shell Size: L32×W24×H12mm

Charging Case Dimensions Diagram
Shell: L172×W30×H22mm
Material: 3D printed plastic material
