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Circuit Description - Honeywell hmr3000 TruePoint User Manual

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HMR3500 User's Guide
2.6.2 Case Dimensions (in inches)

2.7 CIRCUIT DESCRIPTION

The HMR3500 circuit design starts with a microprocessor powered by power supply sub-circuit that takes the input
voltage and creates regulated power for the various other circuits in the HMR3500. Two 2-axis 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
magnetic
sensor
devices
mounted horizontally and vertically
to create a 3-axis measurement of
the incident magnetic field upon
the sensors. Each sensor output is
amplified and sent to a multiplexed
input ADC residing inside the
microprocessor.
After
the magnetic signals are corrected
for hard and soft-iron magnetic
errors created by the environment
to which the compass is attached.
Heading computation uses the
magnetic and tilt information inputs
after
compensation
for
From the basic magnetic heading,
a declination value may be added
to arrive at a geographic north
referenced
heading.
offset value may also be added to
correct for mechanical installation
misalignment
on
the
platform.
www.honeywell.com
1-axis
are
digitizing,
Magnetic
Magnetic
Sensors
Sensors
errors.
An
index
target
Figure 2
Case Dimensions
Temp
Temp
Sensor
Sensor
X
X
Y
Y
Z
Z
Power
Power
Supply
Supply
16 – Bit
16 – Bit
Microcontroller
Microcontroller
Figure 3
HMR3500 Block Diagram
T
T
RS-232
RS-232
I/O
I/O
R
R
X
X
Y
Y
Accels
Accels
Z
Z
5

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