In late 2013, Kauailabs released the nav6 Open Source Inertial Measurement Unit, providing high-accuracy measures of pose (yaw/pitch/roll), with minimal yaw drift of ~1 degree per minute – performance far exceeding the analog gyro included in the FRC Kit of Parts. nav6 was used by several teams at the 2014 FIRST Championships for features including field-oriented drive.
Now, Kauailabs announces the navX MXP Robotics Navigation Sensor, which takes nav6 technology to the next level in two significant ways.
First, navX MXP was designed to use the RoboRIO MXP Expansion Connector – enabling plug-n-play installation on the National Instruments RoboRIO, and adding digital, analog I/O and UART / SPI / I2C port expansion.
Second, navX MXP features a 32-bit ARM processor, the new Invensense MPU-9250 sensor system-on-chip, and software algorithms which take nav6 technology to the next level, including enhanced sensor calibration and algorithms which fuse gyro, accelerometer and magnetometer data into a “9-axis heading”. The “9-axis heading” is enabled by magnetometer calibration tools (available online at no cost) and magnetometer disturbance detection and data fusion algorithms. This capability is known within the aerospace industry as an “Attitude/Heading Reference System” (AHRS). Kauailabs brings this high-tech AHRS capability to FIRST FRC teams – to use, learn and explore. navX MXP is a key component of Kauailabs’ ongoing efforts to make state-of-the-art navigation technologies used in autonomous vehicles (e.g., the Google Car) available to robotics students and enthusiasts as low-cost, open-source products.
navX MXP will be available for puchase online a few days after the 2015 FIRST FRC build season kickoff at AndyMark and Kauailabs. MSRP is $99.
The new LIDAR Lite sensor now available at Garmin offers high-performance distance sensing at a fraction of the cost of comparable sensors.
Lidar Lite has a range of up to 40 meters, and features a low-cost implementation of time-of-flight algorithms used in expensive LIDAR systems like those used with the Google Car. The LIDAR-Lite uses an I2C communications interface, which allows multiple modules to be connected as slaves to a common communications bus, and draws only 100 milliamps of power.
Kauai Labs has ordered one of these units and will be developing a prototype 2D scanner which can measure 360 degrees of distance and SNR, designed for use in FIRST robotics to enable localization. Stay tuned for more developments, we’ll be posting details as they emerge.
As part of the development of the nav6 IMU firmware, Kauai Labs has ported the officially-released Invensense Motion Driver v. 5.1 – enabling its use in Arduino and Maple platforms.
Prior to the release of this library, Arduino developers wishing to access the Digital Motion Processor (DMP) functionality of the Invensense MPU-6050/MPU-9150 sensor could not use an officially-released version of software; instead, a reverse-engineered library released by Jeff Rowberg (developed with help from Noah Zerkin) at www.i2cdevlib.com was used. While the i2cdevlib library was excellent, it had not kept up with more recent releases by Invensense.
Kauai Labs hopes that other inventors find this open source library useful.
The “nav6” inertial measurement unit (IMU) was developed to provide sophisticated inertial navigation capabilities easily available to student robotics teams, including the FIRST Robotics Competition (FRC).
This low-cost circuit board enables a 4-wheel omni-directional drive robot to be driven in “field-oriented” drive mode by accurately measuring the robots “pose” – the amount of tip, tilt and rotation – relative to the field. Additionally, the nav6 can be used to implement robot balancing algorithms.
The nav6 employs the Invensense MPU-6050 IC which includes a 3-axis accelerometer and a 3-axis gyroscope and an on-chip digital motion processor. The nav6 also includes a Honeywell HMC5883L 3-axis magnetometer.
The nav6 is also Arduino-compatible, and can be programmed by anyone via the free Arduino Integrated Development Environment (IDE).
Additionally, software to easily integrate the nav6 into the FIRST robotics control system is available.
Open-source schematics, nav6 firmware source code and cRio code to interface with the nav6 are available online.
Given the popularity of the Arduino among the “maker” community, a large body of software and literally 100s of “shields” which allow extension of the board’s basic functionality by adding different components have been developed.
Yet the Arduino’s underlying 8-bit processor running at 16Mhz, coupled with small amounts of FLASH memory and RAM often limits the projects that can be accomplished. This limitation has been mitigated to some degree by this year’s release of the Arduino Due, which moves the platform to a 32-bit processor running at 84 Mhz with 96Kbytes of RAM and 512Kbytes of FLASH.
However last year saw the release of a much more powerful solution at a cost similar to the Arduino Due: the Netduino Plus 2, which features the STM32 F4 microcontroller. The F4, running at 168Mhz, has twice the speed of the Due’s processor, has double the RAM at 192Kbytes and double the FLASH at 1024 Kbytes. And that’s not all – the Netduino Plus 2 32-bit ARM processor also provides a Floating Point Unit (FPU) and DSP instructions that enable advanced signal processing. And last but not least, the Netuino Plus 2 has an ethernet interface for connecting directly to the internet.
There was only one catch: Arduino developers used to the C-language and the Arduino API had to transition to use the .NET Micro Framework – a new language and a runtime. Moreover, the .NET Micro Framework consumes a significant portion of the onboard RAM/Flash on the Netduino Plus 2.
Seeing this condition, Kauai Labs decided to provide Arduino API and C/C++ language development on the Netduino Plus 2, and has developed the free, open-source software library named “libmaple-f405”. This work is based upon the Leaf Labs “maple” library.
This class is open from ages 10 to 100 and is a great opportunity to gain hands-on experience with the invention process – by designing and building fun projects using custom electronics and software. This year, we’ll using the “Sparkfun Inventor’s Kit for Arduino” to learn and create with.
We are now accepting sign-up for this class, and hope you’ll join us! You can register in person at the Island School office; registration closes June 1.
Many thanks to Ava Zbezda, one of Kauai’s young inventors in this summer’s “Inventing with Software and Electronics” class, for alerting us to this incredible new invention! A team at the MIT Media Lab has created one of the simplest ever tools for inventors – a simple circuit board that can transform almost anything into a button. Imagine playing your favorite video game using bananas from from your kitchen as buttons. Or, imagine drawing buttons on paper with a pencil, and immediately using them as a typewriter. The video below is highly recommended and demonstrates a number of different possibilities. A Kauailabs personal favorite is the piano played by stepping on different stairs.
Makey Makey will be available in November at www.sparkfun.com. Just in time to invent an interactive Christmas tree!
The Design Challenge website is now accepting submissions in the following categories:
Machinery and Equipment
Safety and Security
In order to submit your innovative design idea, inventors need only submit a 500 word technical abstract that includes one to three visual illustrations. There’s also an option of submitting a video in support of your design.
NASA’s “Summer of Innovation” Mini-Grant Program has awarded a grant via the Kauai Robotics Alliance to fund two seminar type sessions where Kauai’s middle school and high school students will become familiar with the NASA Mars rover programs.