Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Brand	WitMotion
Model Number	RM3100
Sensor Type	Three-Axis Geomagnetic
Communication Interface	UART/TTL Serial
Operating Voltage	3.3V - 5V DC
Heading Accuracy	±0.5 Degrees (Static)
Measurement Range	±8 Gauss
Output Data Rate	Up to 100Hz
Operating Temperature	-40°C to +85°C
Dimensions	25mm x 25mm x 12mm

6 reviews

Anonymous

Mar 26, 2026

Rating: 4/5

Great sensor, needs calibration

The build quality is solid and the data output is consistent. Just remember that like any magnetic sensor, it requires proper hard and soft iron calibration in your specific environment to get the best accuracy.

Anonymous

Mar 24, 2026

Rating: 5/5

Best value for money

For the price point, you cannot beat the performance of the PNI sensor inside this module. It provides much better yaw stability than the standard MPU9250 magnetometer I used previously.

Anonymous

Mar 22, 2026

Rating: 4/5

Good documentation support

The hardware works great. I appreciated the clear pinout diagram and the example code for parsing the serial data. Took off one star because the mounting holes are a bit tight for M2 screws.

Anonymous

Mar 14, 2026

Rating: 5/5

Reliable for industrial applications

We are using these in a fleet of autonomous ground vehicles. They handle vibration well and the serial protocol makes integration with our STM32 microcontrollers very easy. Highly recommended.

Anonymous

Mar 05, 2026

Rating: 5/5

Excellent precision for UAV projects

I integrated this RM3100 module into my custom drone flight controller. The heading data is incredibly stable compared to cheaper magnetometers. Setup via the serial interface was straightforward using the provided documentation.

Anonymous

Mar 02, 2026

Rating: 5/5

Stable heading in dynamic environments

Impressed by how quickly the filter converges after power-up. The noise levels are very low, which is critical for our navigation algorithms. Will definitely order more for our next batch.

5 FAQ

Q: Does this module come with a cable included?

A: Yes, the package typically includes a 20cm connecting cable with a JST connector compatible with the module header.

Q: How do I perform the calibration?

A: You need to rotate the sensor in a figure-eight pattern in all three axes while sending the calibration start command. Detailed steps are available in the user manual under the 'Calibration' section.

Q: Is there a Windows software tool to view the data?

A: Yes, WitMotion provides a free PC software tool called 'WT-NAV' or 'Sensor Test' that allows you to view real-time data, plot graphs, and calibrate the sensor.

Q: Can this be used underwater?

A: The module itself is not waterproof. However, if properly potting or enclosed in a waterproof housing that does not contain ferromagnetic materials, it can function underwater.

Q: What is the baud rate for the serial communication?

A: The default baud rate is 115200 bps, but it can be configured to other standard rates such as 9600 or 57600 via command instructions.

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