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TruePoint™ Compass Module 
HMR3500 

 

 
The HMR3500 TruePoint™ compass module is a 3-axis 

digital compass solution with a customizable coordinate 

system for mounting in any desired orientation. Three 

Anisotropic Magneto-Resistive sensors and three MEMs 

accelerometers are combined to provide compass heading 

as well as pitch and roll angles.  

 

The HMR3500 has provisions for hard and soft-iron 

correction algorithms to handle magnetic distortion effects. 

In addition a World Magnetic Model feature is provided to 

automatically add declination angle corrections for 

reference to true north (geographic north). 

 

Honeywell provides product excellence and performance by introducing innovative solid-state magnetic sensor solutions. 

These are highly reliable, top performance products that are delivered when promised. Honeywell’s magnetic sensor 

products provide real solutions you can count on.  

 
 

 FEATURES                                   BENEFITS 

 

4

Precision Compass Accuracy 

4

Better Than 1° Nominal Heading Accuracy (1

σ)

, 0.1° Resolution 

 

 

 

 

4

Tilt-Compensated 

4

±89° Pitch and Roll, 360° Continuous Roll Capabilit y 

 

 

 

 

4

Update Rate to 25Hz 

4

Rapid Heading Computations for Guidance Applications 

 

 

 

 

4

Compact Solution in a 1.97” by 1.65” by 
0.52” PCB Assembly 

4

Small Size for Tight Mounting Conditions, Minimal Layout Constraints 

 

 

 

 

4

Hard and Soft-Iron Compensation 
Routines 

4

User Driven Calibration to Null Stray Fields. A Single Routine for Both 
Hard and Soft Iron Corrections 

 

 

 

 

4

World Magnetic Model Included 

4

Choice of True North or Magnetic North References 

 

 

 

 

4

-40° to +85°C Operating Temp Range 

4

Consumer and Industrial Environment Uses 

 

 

 

 

4

+5 DC Supply Voltage Range 

4

Customizable to a Wide Variety of Power Sources 

 

 

 

 

4

Light Weight 

4

3.0 oz with Aluminum Housing, 0.6 oz PCB only 

 

 

 

 

4

Customizable Coordinate System 

4

24 Custom Coordinate Orientations 

 

 

 

 

4

All Solid State Components 

4

Rugged for User-Defined Orientation Plane 

 
 

Summary of Contents for TruePoint HMR3500

Page 1: ...r products provide real solutions you can count on FEATURES BENEFITS 4 Precision Compass Accuracy 4 Better Than 1 Nominal Heading Accuracy 1 σ 0 1 Resolution 4 Tilt Compensated 4 89 Pitch and Roll 360 Continuous Roll Capabilit y 4 Update Rate to 25Hz 4 Rapid Heading Computations for Guidance Applications 4 Compact Solution in a 1 97 by 1 65 by 0 52 PCB Assembly 4 Small Size for Tight Mounting Cond...

Page 2: ...lux Density 0 7 gauss Resolution 1 sigma 100 readings 0 45 milli gauss Dip Angle Earth s Vertical Field Component 70 70 deg Linearity 0 2 FS Electrical Input Voltage Standard Product 2 5 5 0 5 2 volts DC Power Input Voltage 2 5 to 5 2V 300 mW Digital Interface UART ASCII 4800 9600 38 400 Baud Update Rate Continuous Heading Updates 0 05 10 25 Hz Format Bi directional binary packet data protocol RS ...

Page 3: ... factory default the RS 232 interface is set at 9600 baud with one start bit 8 data bits one stop bit and no parity bits The HMR3500 does not require any hardware or software handshaking or related features The baud rate can be changed by command after initial communication at the current baud rate The CompassHost utility software is a 32 bit Windows application program that is provided with the H...

Page 4: ...is MEMS accelerometers are mounted horizontally and vertically to combine into a 3 axis tilt sensing sub circuit Each accelerometer outputs a Pulse Width Modulated PWM digital signal that the microprocessor measures for pitch and roll angles Besides an integral temperature sensor a 2 axis and 1 axis magnetic sensor devices are mounted horizontally and vertically to create a 3 axis measurement of t...

Page 5: ...est program It is capable of sending and receiving all messages described in this manual except the BAUD message It can display all messages received from the module in the main window with scrolling text It has a small window summarizing the current status of the module and a graphic display of the current compass heading roll and pitch CompassHost can be run under Windows 9x ME NT 4 0 2000 or th...

Page 6: ...ct Honeywell does not warranty or assume liability of customer designed circuits derived from this description or depiction Honeywell reserves the right to make changes to improve reliability function or design Honeywell does not assume any liability arising out of the application or use of any product or circuit described herein neither does it convey any license under its patent rights nor the r...

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