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Overview
Frequently-asked Questions
Why is a 4000 degree/second gyroscope like that present on navX2-MXP useful on a FRC robot?
Simply put, this minimizes yaw errors during high-inertia (e.g., impact) events.
Current consumer-class IMUs typically found on FRC robots (e.g., the "classic" navX-MXP) are limited
to measuring rotation at 2000 degrees/second. At first glance, this seems sufficient, since FRC robots
don't typically rotate 6 times per second. However 2000 degrees translates to 2 degrees in a single
millisecond, and to 20 degrees per 10 millisecond period. If a FRC robot is contacted by a second robot
weighing 120 pounds and moving at 12 feet/second, this can cause the first robot to rotate sufficiently to
cause a 2000 degrees/second gyroscope to saturate – which in turn causes errors in the accumulated yaw
angle.
Will navX2-MXP work with the National Instruments RoboRIO™?
Yes, the navX2-MXP – like it's predecessor the "Classic" navX-MXP – is designed specifically
to work with the RoboRIO. Please see the instructions for
FRC
robot for more details, as there are several installation options.
Will navX2-MXP work with the Android-based FTC Control System?
Yes, navX2-MXP can be used with the Android-based FTC Control System, via its I2C interface.
For more information, please see the FTC Robot Installation instructions and the description of
the
Android
Libraries.
What interface/installation options are available for the navX2-MXP?
Plug-n-play install to the RoboRIO MXP port
Connection to the RoboRIO MXP port via a male-to-female
Connection to one of the RoboRIO USB Connectors
Connection of power (+5VDC)/ground to the navX2-MXP's MXP Connector, and
connection to the TTL UART, I2C or SPI
Aren't the magnetometer (compass heading) readings unreliable when the navX2-MXP is used on a
Robot with powerful motors?
Yes, this is correct. If navX2-MXP is mounted nearby any energized motors, the magnetometer's
ability to measure the (weak) earth's magnetic field is severely diminished.
For this reason, using the magnetometer during a FIRST FRC match is an advanced feature.
installing navX2-MXP onto a FIRST
floppy-disk-style ribbon cable
via a USB Cable
pins.
direct
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