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BREAKOUT BOARDS / ACCEL, GYRO, AND MAGNETOMETERS / ADAFRUIT PRECISION NXP 9-DOF BREAKOUT BOARD
DESCRIPTION
The NXP Precision 9DoF breakout combines two of the best motion sensors we've tested here
at Adafruit: The FXOS8700 3-Axis accelerometer and magnetometer, and the FXAS21002 3-axis
gyroscope.
These two sensors combine to make a nice 9-DoF kit, that can be used for motion and
orientation sensing. In particular, we think this sensor set is ideal for AHRS-based orientation
calculations: the gyro stability performance is superior to the LSM9DS0, LSM9DS1, L3GD20H +
LSM303, MPU-9250, and even the BNO-055 (see our Gyro comparison tutorial for more
details).
Compared to the BNO055, this sensor will get you similar orientation performance but at a
lower price because the calculations are done on your microcontroller, not in the sensor itself.
The trade off is you will sacrifice about 15KB of Flash space, and computing cycles, to do the
Adafruit Precision NXP
9-DOF Breakout Board
- FXOS8700 +
FXAS21002
PRODUCT ID: 3463
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DESCRIPTION
TECHNICAL DETAILS
LEARN
math 'in house.'
To make it fast and easy for you to get started, we have a version of AHRS that we've adapted
to work over USB or Bluetooth LE. Load the code onto your Arduino-compatible board and
you will get orientation data in the form of Euler angles or quaternions! It will work on a
ATmega328 (the fusion code is 15KB of flash) but faster/larger chips such as M0 or ESP8266
will give you more breathing room.
Each board comes with the two chips soldered onto a breakout with 4 mounting holes. While
the chips support SPI, they don't tri-state the MISO pin, so we decided to go with plain I2C
which works well and is supported by every modern microcontroller and computer chip set.
There's a 3.3V regulator and level shifting on the I2C and Reset lines, so you can use the
breakout safely with 3.3V or 5V power/logic. Each order comes with a fully assembled and
tested breakout and a small strip of header. Some light soldering is required to attach the
header if you want to use in a breadboard.
Our tutorial will get you started with wiring diagrams, pinouts, assembly instructions and library
code with examples!
So what makes this so 'Precision'-y, eh?
Glad you asked! This particular sensor combination jumped out at us writing the Comparing
Gyroscopes learning guide since the FXAS21002 exhibited the lowest zero-rate level of any of
the gyroscopes we've tested, with the the following documented levels (converted to degrees
per second for convenience sake):
At +/- 2000 dps 3.125 dps
At +/- 250 dps 0.3906 dps
The zero-rate level is important in orientation since it represents the amount of angular velocity
a gyroscope will report when the device is immobile. High zero-rate levels can cause all kinds of
problems in orientation systems if the data isn't properly compensated out, and distinguishing
zero-rate errors from actual angular velocity can be non-trivial. This is particularly important in
sensor fusion algorithms where the gyroscope plays an important part in predicting orientation
adjustments over time. A high zero-rate level will cause constant rotation even when the device
is immobile!
By comparison, most other sensors tested have 10-20 times these zero-rate levels, which is why
we consider this particular part very precise. There is little work to do out of the box to get
useful, actionable data out of it.
TECHNICAL DETAILS
New Products 4/12/2017
The NXP Precision 9DoF board consists of two separate ICs, described in detail below:
FXOS8700 3-Axis Accelerometer/Magnetometer
2-3.6V Supply
±2 g/±4 g/±8 g adjustable acceleration range
±1200 µT magnetic sensor range
Output data rates (ODR) from 1.563 Hz to 800 Hz
14-bit ADC resolution for acceleration measurements
16-bit ADC resolution for magnetic measurements
LEARN
MAY WE ALSO SUGGEST...
FXAS21002 3-Axis Gyroscope
2-3.6V Supply
±250/500/1000/2000°/s configurable range
Output Data Rates (ODR) from 12.5 to 800 Hz
16-bit digital output resolution
192 bytes FIFO buffer (32 X/Y/Z samples)
Datasheets, PCB CAD files, and Fritzing objects available in tutorial
Product Dimensions: 28.3mm x 20.5mm x 3.0mm / 1.1" x 0.8" x 0.1"
Product Weight: 2.1g / 0.1oz
NXP Precision 9DoF Breakout
Getting up and running (literally?) with our high precision
orientation breakout board.
I2C addresses!
I2C addresses from 0x00 to 0x7F (inclusive)
Adafruit 9-DOF
Accel/Mag/Gyro+Temp
L3GD20H Triple-Axis Gyro
Breakout Board -
Adafruit 9-DOF Absolute
Orientation IMU Fusion
Adafruit 9-DOF
Accel/Mag/Gyro+Temp
Triple-axis
Accelerometer+Magnetometer
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