• WitMotion JY-RM3100 RM3100 electronic compass module PCB close-up, top view with chips and solder pads
  • JY-RM3100 module specifications chart with size 15.24×15.24×7.3 mm and Serial TTL/SPI/IIC interface
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WitMotion JY-RM3100 Serial 3-Axis Electronic Compass Module (PNI RM3100) Heading Angle TTL/SPI/IIC

WitMotion JY-RM3100 Serial 3-Axis Electronic Compass Module (PNI RM3100) Heading Angle TTL/SPI/IIC

WitMotion

$66.46 USD
$66.46 USD
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Overview

The WitMotion JY-RM3100 is a serial 3-axis electronic compass (geomagnetic sensor) module based on a PNI RM3100 magnetic sensor solution, designed to output 3-axis magnetic field data and a heading angle. It uses fluxgate technology and supports multiple interfaces for integration into robotics, UAV/RC navigation, and other heading/attitude sensing projects.

Key Features

  • High sensitivity 3-axis magnetic field measurement with heading angle output
  • Fluxgate technology
  • Multiple interfaces: TTL / SPI / IIC
  • Magnetic field self-recovery
  • Stamp-hole (castellated) package style ("half hole of stamp hole")
  • Built-in MCU for data acquisition (module feature)
  • AT serial port support (module feature)
  • Heading angle calculation (module feature)
  • Magnetic field zero-bias calibration (module feature)

Specifications

Model Parameter Table (as provided)

Parameter QMC5883L JY-RM3100 RM3100 (No software)
Operating voltage (current) 3.3-5V (<5mA) 3.3-5V (<6mA) 3.3-5V (<6mA)
Output data 3-axis mag, heading angle 3-axis mag, heading angle 3-axis mag
Range ±8 Gauss ±800uT ±800uT
Return frequency 0.1-100Hz 1-100Hz 0.1-100Hz
Communication method TTL/SPI/IIC TTL/SPI/IIC SPI
Baud rate 9600 (default); 115200, 460800 9600 (default); 115200, 460800 9600 (default); 115200, 460800
Sensitivity 3000 LSB/Gauss 13nT/LSB 13nT/LSB
Operating temperature -40 to 85°C -40 to 85°C -40 to 85°C
Mode ASCII/Modbus/Modbus Auto output ASCII/Modbus \

RM3100 Performance Parameters (Cycle Counts 50 / 100 / 200)

Parameter name 50 100 200 Unit
Measurement range -800~+800 -800~+800 -800~+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 -40~85

RM3100 Magnetic Kit Main Basic Parameters

3-axis sampling rate 550Hz
Interface SPI & I2C
Dimensions (length x width x height) - MagI2C 4.0 x 4.0 x 0.75mm
Dimensions (length x width x height) - Sen-XY 6.0 x 2.1 x 2.2mm
Dimensions (length x width x height) - Sen-Zv 3.0 x 3.0 x 5.75mm

Additional Text Specs Shown

  • RM3100 SPI measurement range: ±800uT
  • JY-RM3100 measurement range: ±800uT
  • QMC5883L measurement range: ±8 Gauss
  • Measurement noisy is less than 15uT @ 200 Cycle Count
  • Measurement resolution is higher than 13uT @ 200 Cycle Count

Dimensions

JY-RM3100 Module Dimensions (as shown)

  • 15.24mm x 15.24mm
  • 12.7mm (shown on drawing)
  • 2.54mm (shown on drawing)
  • 0.9mm (shown on drawing)
  • Thickness: 7.35mm

RM3100 Module Dimensions (as shown)

  • Size: 12.7mm x 12.7mm
  • Thickness: 7.4mm
  • Additional marked dimensions: 2.45mm, 2.63mm, 2.40mm, 2.68mm, 2.54mm, 7.62mm

QMC5883L Module Dimensions (as shown)

  • 15.24mm x 15.24mm
  • 12.7mm (shown on drawing)
  • 2.54mm (shown on drawing)
  • 0.9mm (shown on drawing)
  • Thickness: 2mm

Wiring / Pinout

JY-RM3100 Pin Names and Functions

Name Function
INT Data status, connect chip DRDY pin
VCC Module power, 3.3V or 5V input
RX Serial data input, TTL level
TX Serial data output, TTL level
GND Ground line
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

QMC5883L Pin Names and Functions

Name Function
VCC Module power supply, 3.3V or 5V input
RX Serial data input, TTL level
TX Serial data output, TTL level
GND GND ground line
SCL I2C clock line
SDA I2C data line
D0 D0 connects to MCU's PD4
SWCLK SWCLK connects to MCU's SWCLK
DRDY Connects to MCU's DRDY
D3 Connects to MCU's PA3

RM3100 Module Pad Labels (as shown)

  • VCC, GND, GND, DRDY
  • CLK, MISO, MOSI, SSN

Demo / Data Display

  • Serial communication; PC software displays the data in real time.
  • Displayed fields include: Magnetic X, Magnetic Y, Magnetic Z, Yaw.

Notes

  • RM3100 magnetic sensor kit composition (as provided): 2 x Sen-XY-f (pn13104), 1 x Sen-Z-f (pn13101), and MagI2C (pn13156) control chip, for 3D magnetic field measurement.
  • Performance comparison data shown (Hall sensor vs PNI magnetic sensor): Sensitivity 300nT vs 13nT; Noise 500nT vs 15nT; Power consumption current (8Hz, 3 axes) 280uA vs 70uA.
  • For selection/compatibility questions (JY-RM-3100 or RM3100 option) and integration support, contact support@rcdrone.top or visit https://rcdrone.top/.

Details

WitMotion JY-RM3100 serial 3-axis electronic compass module (PNI RM3100) with heading angle output

The JY-RM3100 module uses a PNI RM3100 fluxgate magnetic sensor to output 3-axis magnetic field data and a calculated heading angle.

PC software demo of JY-RM3100 compass streaming Magnetic X/Y/Z data and yaw over serial connection

Real-time serial output makes it easy to verify Magnetic X/Y/Z readings and yaw on a computer during setup and calibration.

Parameter comparison table for QMC5883L vs JY-RM3100 vs RM3100 (no software): range, interface, baud rate

A quick parameter comparison highlights measurement range, update frequency, and interface options across common compass solutions.

QMC5883L module wiring connection and pinout with dimensions, including VCC, RX/TX, SCL/SDA, GND and SWD pads

Clear pin labeling helps map power, UART, and I2C connections when integrating the module into a controller or dev board.

Pin function table for module signals: VCC, RX, TX, GND, SCL, SDA, D0, SWCLK, DRDY, D3JY-RM3100 module dimensions and pinout for TTL/SPI/I2C connections, including INT, VCC, RX, TX, SCL/SCLK, SDA/MOSI

Castellated “stamp-hole” edges and multi-interface pinout simplify soldering and integration for TTL, SPI, or I2C builds.

JY-RM3100 pin definition table: INT, VCC, RX/TX, GND, SWIM, SA1/MISO, SCL/SCLK, SDA/MOSI, SA0/SSNRM3100 module board size drawing (12.7mm x 12.7mm) with front/back views and SPI pins labeled

Mechanical dimensions and labeled pads support fast PCB layout for RM3100-based designs.

Text description of PNI RM3100 magnetic sensor kit components including Sen-XY, Sen-Zf and MagI2C control chipRM3100 compass sensor feature summary: low consumption, stamp-hole package, SPI interface, high precision, 3-axis

Fluxgate sensing and a standard SPI interface make RM3100 modules a strong fit for robotics, UAV, and navigation projects.

RM3100 performance parameters table with cycle counts 50/100/200: gain, sensitivity, noise, sampling rate, currentRM3100 magnetic kit basic parameters table: 3-axis sampling rate 550Hz, interface SPI & I2C, component dimensionsPerformance comparison table: Hall sensor vs PNI magnetic sensor showing sensitivity, noise and power consumption

A side-by-side comparison calls out the lower noise and lower current draw advantages of the PNI magnetic sensor approach.

Product advantages chart comparing RM3100 module vs RM3100 chip: built-in MCU, AT serial support, heading calc, calibration

Choosing the full module adds onboard acquisition and serial features, including heading-angle calculation and zero-bias calibration support.

RM3100 module capability graphic highlighting ultra-low noise, wide dynamic range, high stability, and interface flexibilityRM3100 hardware analysis graphic labeling MagI2C 13156 control and geomagnetic sensor elements (13101/13104)How-to-use wiring guide connecting JY-RM3100 to computer via USB-TTL adapter with VCC, TX-RX, RX-TX, GND mapping

Basic USB‑TTL wiring (VCC, GND, and crossed TX/RX) enables quick PC testing before integrating with a flight controller or MCU.

Development evaluation board testing view with onboard CH330 driver and USB-C plug-and-play connection to PC software

An optional evaluation setup with onboard USB driver supports plug-and-play testing for rapid prototyping.

MCU wiring diagram for WitMotion RM3100 3-axis compass module showing VCC, GND, SCLK, MOSI, MISO, SSN and DRDY pins

The RM3100 compass module uses a simple pin header layout with labeled power and SPI signal pins to simplify MCU wiring.

ASCII data protocol screen for WitMotion JY-RM3100 (RM3100) compass module showing Magnetic X/Y/Z and yaw output

The JY-RM3100 compass module outputs Magnetic X, Magnetic Y, Magnetic Z, and yaw data in ASCII (AT command) mode for serial parsing.

Application examples for a 3-axis electronic compass module: SINS navigation, parking, security, and medical equipment

A 3-axis electronic compass module can be integrated into navigation systems, parking solutions, security access control, and medical equipment.

Development kit contents listing manual, Windows software (JY-RM3100), and SDK folders for WitMotion compass module

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

Shipping list showing QMC5883L compass module front and back views with included pin headers

The package includes a QMC5883L module with front/back layout and multiple pin headers for soldering to your project.

WitMotion JY-RM3100 3-axis electronic compass module front/back with labeled pin pads and header pins

The JY-RM3100 compass module includes separate pin headers and clearly labeled pads for wiring power, data lines, and interrupt.

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