Compass Sensor

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2D Electronic Compass Sensor, 0°-360°, RS232/RS485/TTL/RS422

$193.47

SKU: ATO-CPS-SCM225

Buy 2D electronic compass sensor online with a measurement range of 0° to 360° and an accuracy of ±1°. The compass sensor supports multiple communication interfaces including RS232, RS485, TTL, RS422 and Modbus. It has a wide operating temperature range from -40℃ to +70℃.

3D Electronic Compass Sensor for Car/Boat

$273.77

SKU: ATO-CPS-DCM260B

Factory price 3D electronic compass sensor provides high-precision 3D direction measurement, with a tilt angle of ±85° and a resolution of 0.1°. Electronic compass sensor uses hard and soft magnetic calibration algorithms, and can choose RS232, RS485 and TTL interfaces, suitable for applications in antenna stabilization, vehicles, ships, system integration and many other fields.

3D Dynamic Compass Sensor for Ship/Drone/Satellite Dish, 9 Axis

$251.76

SKU: ATO-CPS-DDM306B

This 9-axis 3D dynamic compass sensor delivers high-precision heading and orientation for ship, drone, and satellite dish systems. With 0.8° heading accuracy and dynamic tilt compensation, the digital compass sensor ensures robust performance, supporting 20Hz output and hard/soft iron calibration, and guarantees reliable navigation and stabilization in challenging environments.

3D Electronic Compass Sensor, IP67, RS232/RS485/TTL

$566.08

SKU: ATO-CPS-DCM302B

3D electronic compass sensor for sale online, providing accurate three-axis magnetic field measurement with a resolution of 0.1°. Electrical compass has an IP67 protection level, is dustproof and waterproof, and operates stably within a temperature range of -40℃ to +85℃. RS232, RS485, and TTL communication interfaces can be selected for easy integration with various systems, and can be applied in industrial, automotive, outdoor applications, and more.

3D Electronic Compass Sensor, 0°-360°, RS232/RS485/TTL/RS422

$1,116.54

SKU: ATO-CPS-HCM365

The full attitude 3D electronic compass sensor calculates the heading in real time through the central processing unit, and can measure the heading from 0 to 360° with an accuracy of 0.3° to 0.5°. It can choose multiple communication interfaces (RS232/RS485/TTL/RS422) and has an IP67 protection level, which can operate at -40℃~+85℃.

High Accuracy Electronic Compass Sensor, IP67, RS232/RS485/TTL

$904.85

SKU: ATO-CPS-HCM375B

High-accuracy electronic compass sensors for sale, providing accurate 3-axis directional measurements. 3D electronic compass sensor has an IP67 protection level and is completely dustproof and waterproof. This electronic compass sensor can be equipped with RS232, RS485, and TTL interfaces, with a resolution of 0.1°, making it suitable for applications such as antenna stabilization, vehicles, system integration, and more.

6-axis Magnetic Compass Sensor, 0°-360°, RS232/RS485/TTL

$1,233.53

SKU: ATO-CPS-HEC3500D

The magnetic compass sensor provides 0°-360° heading with high accuracy. Output options are RS232/RS485/TTL. This 6-axis digital compass sensor ensures reliable performance, featuring a wide tilt range and robust IP67 protection for demanding applications. Hard and soft magnetic calibration is supported for enhanced data accuracy.

9-axis Digital Compass Sensor, 0°-360°, RS232/RS485/TTL

$192.94

SKU: ATO-CPS-DCS306

ATO 9-axis compass sensor delivers precise 0°-360° heading measurement with 0.1° repeatability. This AHRS unit features hard/soft iron calibration and 0.01° resolution, offering IP67 protection and 3000g vibration resistance. RS232/RS485/TTL digital interfaces support a 100Hz sampling rate. Best compass sensor maintains stable performance from -40°C to 85°C, and consumes only 30mA at 5V DC supply.

2D Electronic Compass Module, 0°-360°, RS232/RS485/TTL/RS422

$178.16

SKU: ATO-CPS-SCM220

Cost-effective 2D electronic compass module (single board) has a measurement range of 0° to 360° and high accuracy of ±1°. It supports multiple communication interfaces, including RS232, RS485, TTL, RS422 and Modbus (optional). The module has an operating temperature range of -40°C to +70°C, has good anti-magnetic interference ability, and is widely used in automation control, navigation positioning, robotics and other fields.

High Accuracy Electronic Compass Module, Three Axis, RS232

$1,119.23

SKU: ATO-CPS-DCM6

High-accuracy electronic compass module provides precise three-axis directional measurement with a resolution of 0.1°. It supports standard RS232 output interface and has a tilt measurement range of ±85°, making it very suitable for application in electronic compasses and magnetic compasses.

A compass sensor is an electronic device that detects direction. It works like a digital compass. It tells a device which way it is facing — north, south, east, or west. These sensors are common in smartphones, drones, robots, navigation systems, and outdoor gear.

Compass Sensor Types and Their Key Features

2‑Axis Electronic Compass Module (ATO-CPS-SCM225)

Magnetic field range: ±1 to ±8 gauss. Operates from -40°C to +70°C.
Heading accuracy: ±1°. Good for basic navigation and orientation.
No tilt compensation. The device must stay perfectly level.
Low cost. Ideal for simple automation control systems.

3‑Axis Electronic Compass (ATO-CPS-DCM260B / DCM302B / HCM365 / HCM375B)

Uses a MEMS magnetometer to measure magnetic fields in 3D.
Built‑in accelerometer corrects heading up to ±85° of tilt.
Heading accuracy reaches 0.3°–0.5° (HCM365) for precise tasks.
Stable from -40°C to +85°C (DCM260B, DCM302B, HCM365, HCM375B).
DCM302B, HCM365, and HCM375B are IP67 rated (dust‑tight and waterproof).
Common in automotive, marine, and industrial robots.

9‑Axis AHRS Compass (ATO-CPS-DDM306B / DCS306)

Includes 3‑axis magnetometer, gyroscope, and accelerometer.
Provides full attitude and heading reference for dynamic motion.
DDM306B outputs up to 20 Hz. DCS306 outputs up to 100 Hz.
DCS306 draws only 30 mA at 5V DC — good for battery power.
On‑chip calibration automatically removes hard‑iron and soft‑iron errors.

6‑Axis Magnetic Compass (ATO-CPS-HEC3500D)

Combines 3‑axis magnetometer with attitude sensors in a compact design.
High accuracy: 0.3° heading error.
Hard‑iron and soft‑iron calibration built into the chip.
IP67 standard, with optional IP68 for full submersion (marine/outdoor).
Wide operating temperature: -40°C to +85°C.

Key Considerations When Choosing a Compass Sensor

Accuracy vs. Cost: ±1° (SCM225) for most tasks. ±0.3° (HCM365) for antenna or ship navigation.
Tilt Compensation: Mandatory for vehicles, drones, ships. Without it, 10° tilt → >10° error.
Environmental Protection: IP67/IP68 for industrial/outdoor. DCM302B and HCM375B are dust‑tight and waterproof.
Interface Compatibility: ATO supports RS232, RS485, TTL, RS422, and Modbus for PLC.
Calibration: Metal‑rich environments need on‑chip hard/soft‑iron cal. DDM306B and HEC3500D have it.
Temperature Range: Outdoor/automotive use needs -40°C to +85°C. DCM260B, DCM302B, HCM365, HCM375B qualify.
Output Rate: Fast platforms (drones, AGVs) need high rates. DCS306 offers 100 Hz.
Power Budget: Battery‑powered devices pick low‑consumption models (e.g., DCS306: 30 mA) and duty‑cycle.

Compass Sensor Selection Guide

Compass sensors are essential for navigation, robotics, and automotive systems. Choosing the right model depends on accuracy, tilt compensation, environment, and budget. The table above offers a quick comparison of all ATO models.

Model	Heading Accuracy	Tilt Comp	Best For
ATO-CPS-SCM225	±1°	No	Basic navigation, automation, low-cost
ATO-CPS-SCM220	±1°	No	Single-board, cost-effective automation
ATO-CPS-DCM260B	0.8°	Yes (Accel)	Antenna stabilization, vehicles, ships
ATO-CPS-DDM306B	0.8°	Yes (Accel+Gyro)	Drones, ships, satellite dishes (20Hz)
ATO-CPS-DCM302B	0.5°	Yes (Accel)	Industrial, outdoor, waterproof (IP67)
ATO-CPS-HCM365	0.3°–0.5°	Yes (Accel)	Full attitude, drones, robots (IP67)
ATO-CPS-HCM375B	0.5° (tilt<10°)	Yes (Accel)	High accuracy, antenna stabilization (IP67)
ATO-CPS-DCS306	2°(static)/3°(dynamic)	Yes (Accel+Gyro)	Fast response (100Hz sampling), IP67
ATO-CPS-HEC3500D	0.3°	Yes (Accel+Gyro)	High precision, 20000g shock, IP67/68
ATO-CPS-DCM6	0.5°(tilt<10°)/1.5°(tilt<85°)	Yes (Accel)	OEM module, compass applications

FAQs of Digital Compass

Q1: What is the difference between a 2-axis compass and a 3-axis compass?

A: A 2-axis compass measures only the horizontal magnetic field. It needs a perfectly level platform. A 3-axis compass measures all three dimensions. It can compensate for tilt using an integrated accelerometer. Unless your device is permanently horizontal, always choose 3‑axis. All modern MEMS compass sensors are 3‑axis.

Q2: How do I calibrate a compass sensor in a metal enclosure?

A: Most ATO compass sensors (DDM306B, DCM260B, HEC3500D) have on‑chip hard‑iron and soft‑iron calibration. A simple one‑time field calibration — rotating the device in a figure‑8 pattern — is usually enough. If the mounting location changes, recalibrate to keep accuracy.

Q3: Why does temperature matter for heading accuracy?

A: The magnetic properties of sensor materials and nearby metals change with temperature. This causes heading drift. Many cheap sensors drift 5°–10° from -40°C to +85°C. ATO's temperature‑compensated models (like DCM260B) keep error under 0.8° across that range — critical for outdoor and automotive use.

Q4: Do I need a gyroscope in addition to a compass?

A: For static orientation, a compass (magnetometer) plus accelerometer is enough. For fast rotations (drones, UAVs, stabilization systems), a 9‑axis AHRS model like DDM306B or DCS306 includes a 3‑axis gyroscope to handle rapid angular motion accurately.