• WitMotion RM3100 electronic compass geomagnetic sensor module PCB, angled top view
  • RM3100 module specifications chart with size 12.7×12.7×7 mm, 3.3V, SPI interface
  • RM3100 module hardware diagram with labeled sensors PNI13156, 13101 and 13104
  • SPI wiring diagram for RM3100 module showing VCC, GND, CLK, MISO, MOSI and SSN
  • RM3100 module feature graphic highlighting three axes, SPI interface, 3.3V and resolution
  • Shipping list graphic showing RM3100 module, quantity 1 piece
  • Parameter table for RM3100 sensor with cycle counts, noise, sensitivity, SPI and temperature range
  • RM3100 module dimensions and pinout diagram with 12.5 mm size and 8-pin assignment
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WitMotion RM3100 Electronic Compass Geomagnetic Sensor Module for Magnetic Heading, High-Accuracy SPI Interface

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

WitMotion

$66.32 USD
$66.32 USD
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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 support@rcdrone.top.

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

WitMotion RM3100 electronic compass geomagnetic sensor module overview with 3-axis heading and SPI interfacePC software demo reading RM3100 magnetic X/Y/Z and yaw in real time over serial connectionParameter comparison table for QMC5883L, JY-RM3100 and RM3100 sensor modules (voltage, range, interface)QMC5883L wiring connection and board dimensions with labeled VCC, SCL, SDA, GND and DRDY padsQMC5883L pin function table for VCC, RX/TX, GND, SCL, SDA, D0, SWCLK, DRDY and D3JY-RM3100 module dimensions and pin labels for SPI/I2C/TTL, including INT, SWIM, MOSI and MISOJY-RM3100 pin definitions for INT, VCC, RX/TX, SWIM, SA1/MISO, SCL/SCLK, SDA/MOSI and SA0/SSNRM3100 SPI module size drawing with 12.7 mm board outline and back-side pin labels (CLK, MISO, MOSI, SSN)Text description of PNI RM3100 magnetic sensor kit components (Sen-XY, Sen-Z and MagI2C control chip)RM3100 module feature highlights: low power, stamp-hole package, 3-axis sensing and SPI interfaceRM3100 performance parameters table with measurement range, gain, sensitivity, noise and sampling rate by cycle countRM3100 magnetic kit basic parameters table listing 550 Hz 3-axis sampling, SPI/I2C and component dimensionsPerformance comparison table of Hall sensor vs PNI magnetic sensor for sensitivity, noise and current consumptionProduct advantages comparison: RM3100 module with built-in MCU and heading output vs bare RM3100 chipRM3100 module benefits infographic covering ultra-low noise, wide dynamic range, high stability and interface flexibilityRM3100 hardware analysis labeling MagI2C 13156 and sensor elements 13101/13104 on the module PCBWiring guide to connect RM3100 module to a computer using a USB-TTL adapter (VCC, TX/RX, GND)Development board testing setup with CH330 driver and Type‑C plug-and-play connection to PC softwareWitMotion RM3100 electronic compass module SPI wiring diagram showing VCC, GND, SCLK, MOSI, MISO, SSN and DRDY pins

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

Screenshot of WitMotion RM3100 data protocol software in ASCII mode showing Magnetic X/Y/Z and Yaw output fields

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

Application examples for an electronic compass sensor module, including navigation, parking, security access, and medical devices

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

Development kit downloads for WitMotion RM3100 compass module: manual, Windows software (JY-RM3100) and SDK

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

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

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

WitMotion JY-RM3100 electronic compass module front and back view with SPI pins and header connectors

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

RM3100 electronic compass geomagnetic sensor module front and back, showing SPI pins VCC, GND, DRDY, CLK, MISO, MOSI, SSN

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

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