Kauai Labs navX-MXP User Manual page 11

Overview
Frequently-asked Questions
accelerometers.
MEMS accelerometers which feature these low noise levels are beginning to emerge,
but are currently very expensive. KauaiLabs is actively researching these technology
developments and projects that MEMS technology that is both (a) low noise (1 micro-g
per square root hertz) and (b) available at low cost will be available in approximately 5
years (~2020). KauaiLabs plans to develop a product which can be used for
accelerometer-based dead-reckoning at that time.
Did Invensense finally publicly release a description of the DMP (Digital Motion
Processor) and interface specs, or are you using what other people reverse engineered a
while ago?
The navX-MXP firmware uses the officially released Invensense MotionDriver version
6.1. Kauai Labs has ported this driver to work correctly on the navX-MXP's STM32F411
micro-controller.
What's the difference between navX-MXP and the navX-MXP Aero?
navX-MXP and the navX-MXP Aero share a single design. navX-MXP Aero adds a
pressure sensor (MS5611) providing additional altitude measurements with a resolution
of 10 cm.
Since the pressure sensor is an expensive component, this sensor was left off of navX-
MXP, decreasing the cost for those not desiring an altitude measurement.
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