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Sviluppa Sistemi embedded con
LabVIEWDesign Real Systems, Fast
Luca GalloAcademic Sales Engineer,
National Instruments Italy
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Agenda
• Introduction to NI
• Introduction to LabVIEW
• Introduction to NI myRIO
• Introduction to LabVIEW Real-Time
• A simple control system with LabVIEW and myRIO
• BONUS: getting started with LV and Raspberry PI
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NI Example Applications
Controlling a Robotic Manipulator for Nuclear Decommissioning
Tuning Aston Martin Engines for Endurance Races
Plasma control in the world’s first bench top Tokamak
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Controlling 70-Ton Robotic Gripper Arms for Offshore Wind Turbine Construction
Measuring Biomechanical Stresses in Rugby Scrummaging
Control and Monitor Community Generation Sources in Canada’s Smart Grid
NI Example Applications
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More than 30,000 companies…including 90% of Fortune 500 manufacturing companies
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The Origin of Automated Measurements
• Traditional pen-and-paper approach
• Redundant circuitry between instruments (e.g., displays)
• Manual data recording and analysis
• Error-prone processes
• Difficult to reproduce or redo
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Measurement Challenges Are Compounded By:
• Compressed Timelines
• Fixed Software and Hardware
• Conflicting Programming Approaches
• Inadequate Hardware Performance
• Disparate Driver APIs
• Varying Sensors and Connectivity
• Custom Signal Conditioning
• Advanced Visualization
• Changing Application Requirements
• Complex Analysis Algorithms
• Evolving Technology Trends
• Confusing Data Storage
• Differing Sampling Rates
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Mixed-Measurement Applications Are Diverse
Pressure Temperature Force Strain
Vibration Torque Displacement
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Example Application: Air Quality Measurements
• Potential Sensors Needed:• Context
o GPS– Timestamp
– Position
o Attitude
o Altitude
o Range Finder
• Environmental
o Temperature
o Oxygen
o Carbon Dioxide
o Ozone
o Nitrogen
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Sensors, Interfaces, and Signal ConditioningSensor Interface Conditioning?
GPS RS232 No
Attitude, Altitude RS232 No
LiDAR Ethernet No
Temperature Analog Voltage Required
O2, CO2, O3, NH3 Analog Voltage Required
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Software Provided With SensorsSensor Software
GPS
Attitude, Altitude
LiDAR
Temperature
O2, CO2, O3, NH3 <No Software Provided>
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With a System Like This, How Do You Accommodate…
• …changes in requirements?
• …mixed measurements in a single system?
• …varying connectivity?
• …signal conditioning for sensors?
• …adding or replacing measurements or sensors?
• …incorporating timing, triggering, or synchronization?
• …leveraging emerging technology trends?
• …multiple disparate software environments and APIs?
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Industries and Applications
Hardware and I/O Devices
PXI and Modular
Instruments
Desktops and
PC-Based DAQNI CompactRIO
Test Monitor Embedded Control Cyber Physical
Open Connectivity
With Third-Party I/O
National Instruments’ Strategy: Graphical System DesignYour Investment in a Platform-BasedApproach to Measurements Scales Across…
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Introduction to LabVIEW
ni.com/students/learn-rio
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Data Flow
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LabVIEW Getting Started Window
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LabVIEW Getting Started Window
Additional support, tutorials, and explanations can all be found using the links here. These are specifically
tailored to NI myRIO users.
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Create a Project
• Click the Create Project button
• Select Blank Project.
• Click Finish.
• To save the project:• File >> Save
• Select the desired directory and choose a meaningful name.
• Remember, two LabVIEW projects cannot share the same directory.
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Project Explorer
• Find, access, and organize project files
• Deploy or download files to targets
• Manage code for build options
• Executables, installers, and zip files
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Parts of a VIVIs have three main components:
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Parts of a VI – Front Panel
The front panel is constructed using controls (inputs) and indicators
(outputs).
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Parts of a VI – Block Diagram
Front panel object appear as
terminals on the block diagram.
This is where “programming” is done in LabVIEW.
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Overview of NI myRIO
ni.com/students/learn-rio
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NI myRIOXilinx Zynq FPGA and dual-core ARM Cortex-A9
Stereo audio I/O
User defined LEDs
User defined button
10 channels analog input6 channels analog output
40 channels digital I/O (SPI, I2C, UART, PWM, Encoder input)
Integrated WiFI
Onboard 3-axis accelerometer
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Additional Features
• Fully programmable FPGA through LabVIEW FPGA
• Dual-Core ARM Cortex-A9 processor
• Expandable ecosystem of sensors and actuators
• Ready to use projects and courseware
• Deploy code to real-time processor and FPGA via USB or WiFi
• Minutes to first measurement
• Processor programmable in C/C++
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NI myRIO Expansion Port (MXP)
4 AI
2 AO
3 PWMs
1 Quad Encoder
1 UART
1 SPI
1 I2C
5 DIO
MXP B
Identical Connectors
MXP A
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miniSystems Port (MSP)
Identical to NI myDAQ
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Why myRIO Really Matters in Education
Leading Industry Grade Technology
The same technology is used in our latest industry and research ready Compact RIO systems
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Introduction to LabVIEW Real-Time
ni.com/students/learn-rio
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What is Real-Time?
• Real-time does not always mean real fast
• Real-time means absolute reliability
• Real-time systems have timing constraints that must be met to avoid failure
• Determinism is the timing reliability of the system
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Critical Applications to Consider
Event Response Closed-Loop Control Critical Tests
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When General Purpose OSs Fall Short
• Design for fairness and user responsiveness vs. strictly prioritizing tasks
• Focus on multitasking instead of maximum reliability / uptime
• Not the result of bad products, only certain design goals
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Key Careabouts for Critical Applications
• Jitter: execution time variability of a given operation or application
ExecutionTime (ms)
Iterations
21.9
2.1
1.3
2.8
2.1Mean = 2.03 ms
Jitter
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Key Careabouts for Critical Applications
• Determinism: a condition that is met if an operation or application has bounded jitter
ExecutionTime (ms)
Iterations
21.9
2.1
1.3
2.8
2.1Jitter
Bound (for hardreal-time systems)
…n
Mean = 2.03 ms
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NI Linux Real-Time
• Unlock the vast Linux ecosystem
Raima
MySQL
SQLite
MongoDB
CouchDB
OpenVPN
IP Tables
System Logging
fail2ban
denyhost
C/C++
Shell Scripting
Python
Ruby
Perl
Isshd
IPv6
SNMP
NTP
netstat
Database Security Code Reuse Connectivity
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Control System with myRIO and LabVIEW Real-Time
ni.com/students/learn-rio
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Raspberry PI 3A 1.2GHz 64-bit quad-core ARMv8 CPU
4 USB Ports
Integrated WiFi
Combined 3.5mm audio jack and composite video
Ethernet Port
1GB RAM
40 GPIO pins
Camera interface (CSI)
Display interface (DSI)
VideoCore IV 3D graphicscore
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www.labviewmakerhub.com
LabVIEW LINX Library
LINX provides easy to use LabVIEW VIs for interacting with common embedded platforms like Arduino, Raspberry PI, chipKIT and myRIO. Use the built in sensor VIs to start getting data to your PC in seconds or use the peripheral VIs to access your devices digital I/O, analog I/O, SPI, I2C, UART, PWM and more.
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NI myRIO Kits | ni.com/myrio
Starter EmbeddedMechatronics
LEDs & switches7-segment display
PotentiometerThermistor
Photo resistorHall effect
Microphone/SpeakerBattery holder
DC motor
DC gear motors/encodersH-bridge driverAccelerometerTriple-axis gyro
Infrared proximity sensorAmbient light sensor
Ultrasonic range finderCompass
Hobby servo motors
RFID reader kitNumeric keypad
LED matrixDigital potentiometer
Character LCD Digital temp sensor
EEPROM
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NI myRIO | Courseware
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Learn More About Programming NI myRIO
ni.com/learn-myrio