WitMotion RM3100 Electronic Compass Geomagnetic Sensor Module for Magnetic Heading, High-Accuracy SPI Interface

Overview

The RM3100 geomagnetic sensor module is an electronic compass module for 3-axis magnetic field measurement and magnetic heading output. The source images show a compact half-hole stamp-hole board, SPI and I2C interface support, TTL serial support on the module variants, and PC software that displays magnetic data in real time. For setup support, contact [email protected].

Key Features

• 3-axis magnetic field output with heading angle support.
• RM3100 measurement range: -800 to +800 uT.
• Low-noise, high-resolution module design with built-in MCU data acquisition shown in the product advantages.
• Supports SPI and I2C interfaces; the pin labels also show TTL serial, DRDY/INT, SWIM, SCL/SCLK, SDA/MOSI, SA1/MISO, and SA0/SSN.
• Operating voltage shown as 3.3V or 5V input, depending on the module variant.
• Operating temperature: -40 to 85 C.

Specifications

RM3100 Performance Parameters

Parameter	50 Cycle Counts	100 Cycle Counts	200 Cycle Counts	Unit
Measurement range	-800 to +800			uT
Gain	20	38	75	LSB/uT
Sensitivity	50	26	13	nT
Noise	30	20	15	nT
Noise density	1.2			nT/Hz
Repeatability > +/-200uT	15	8	8	nT
Hysteresis > +/-200uT	15			nT
Linearity > +/-200uT	0.5			%
Single-axis sampling rate	1600	850	440	Hz
Single-axis average current	70	150	260	uA
Bias resistance	121
Operating temperature	-40 to 85			C

RM3100 Module Basic Parameters

Parameter	Value
3-axis sampling rate	550Hz
Interface	SPI & I2C
MagI2C dimensions (L x W x H)	4.0 x 4.0 x 0.75mm
Sen-XY dimensions (L x W x H)	6.0 x 2.1 x 2.2mm
Sen-Zv dimensions (L x W x H)	3.0 x 3.0 x 5.75mm

Pin Functions

Pin	Function
VCC	Module power supply, 3.3V or 5V input
RX	Serial data input, TTL level
TX	Serial data output, TTL level
GND	Ground line
INT	Data status, connect chip DRDY pin
SWIM	Chip SWIM pin
SA1/MISO	1 bit of IIC slave address / SPI master input, slave output
SCL/SCLK	IIC clock line / SPI clock signal line
SDA/MOSI	IIC data line / SPI master output, slave input
SA0/SSN	0 bit of IIC slave address / SPI active low select port

Details

The RM3100 compass module uses an SPI pinout with labeled pads (VCC, GND, SCLK, MOSI, MISO, SSN, DRDY) to simplify MCU wiring and soldering.

The RM3100 module can output Magnetic X, Magnetic Y, Magnetic Z, and yaw heading data using an ASCII (AT command) data protocol.

RM3100 geomagnetic compass modules are commonly used for magnetic heading in navigation systems, parking solutions, security access control, and medical equipment.

The RM3100 development kit includes a manual, Windows software (JY-RM3100), and an SDK to support setup and integration.

The QMC5883L compass sensor module comes with front and back views for reference and includes multiple pin headers for soldering.

The WitMotion JY-RM3100 RM3100 compass sensor module includes front/back board views and pin headers for SPI wiring.

The RM3100 compass module provides clearly labeled SPI and power pins for straightforward magnetic heading integration.