LabVIEW controlled Arduino outputting self-clocking signal

Hello All,
I am trying to be able to control my LED light strip (http://www.adafruit.com/products/1376) using LabVIEW and Arduino. To do so I need to make Arduino output a digital self-clocking signal, specifically a combination of two square waves of fixed frequency with varying duty cyle. The two waves represent either a 0 or 1 to the LED strip.
0 = HIGH for 400 ns then LOW for 850 ns
1 = HIGH for 800 ns then LOW for 450 ns
In the end, using either of those waves as a bit, I would like the full signal to have 3600 bits. After one full signal the pin would remain LOW until I want to change the color again, and would send another 3600 bit signal.
(If you want more info on the data transmission protocol, there is more info here: http://learn.adafruit.com/adafruit-neopixel-uberguide/advanced-coding#writing-your-own-library)
Is there a way of controlling the output of the Arduino at such high speeds through LabVIEW. If you can think of any way of doing this, please let me know.
Thanks!

AFAIK, the arduino LabVIEW interface module only reads and writes pin values, and it can't do this with the timing precision you need. The only way around this is to write some arduino code, which can't be done in LabVIEW.

Similar Messages

Fuzzy control using Labview and arduino

Dear all,
I have been trying to control the output of an LED using a fuzzy logic controller, based on temperature and humidity values that I receive from the DHT22 sensor via arduino in the LABVIEW setup, but the problem is, I am not sure how to set up the PWM pin of arduino for that purpose. I have used an arrangement for the setup but it has not given any LED signal so far. The VI is attached herewith. PS- I have connected the LED to pin 6 (PWM pin) of the arduino UNO board.
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Attachments:
temhumlightctrl1.vi ‏48 KB

Just start with a simple VI commanding a PWM, and put a meter or a scope to see if the output changes. If you can't get any output there is likley a problem with your setup. If you are driving more than an LED you'll need some kind of buffer circuit or opamp to increase the current capabilities. These micros can't drive much power so if you intend on using this PWM for controlling temperature and humidity you won't be able to drive it directly.
Also be aware that your loop time is going to be relativly slow, and not deterministic. Most control systems like PIDs need to have tight timing to ensure that the system stays stable while having a decent response time. Since temperature and humidity change pretty slowly this will likely work just fine. But know that the time it takes to send a command to the Arduino, have it go out, take a sample and then send it back over serial won't be consistent.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

How to control HP 33120A and output a DC signal?

Hellow!
I'd like to control HP 33120A function generator,right now i have use the HP 33120A-WFM Config EX.VI and i can output Sin,Squart...wave,but when i try to output the DC signal,the amplitude control seems not work,what shall i do to output a DC signal and control its amplitude,Thanks!

I haven't worked with this generator or its driver, but sometimes the DC level is controlled by changing the offset instead of the amplitude. You might want to check this out.
Hope that this helps,
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Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
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mailto:[email protected]

Labview FPGA 2012 - Clock Signal

I'm trying to access the FPGA clock signal in Labview 2012. I have a NI PCIe-7852R card, with which I'm using the 40MHz onboard clock signal. I'd like to use that signal to clock some logic in my design, but there seems to be no easy way to access it - or, at least, the "clock signal" component has its own data type which only connects to a timed loop (the logic in question is in the form of a VHDL black box, which requires multiple clock rates; therefore since the IP integration node only allows one signal to be tied to the clock I need others as well, which will be fractions of the onboard clock). Any advice?

I use a SCTL running @ 20MHz to generate a 10MHz clock.
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Please help me with my electrical engineering homework : temperature control and watering system for greenhouse using labview and arduino

temperature control and watering system for greenhouse using labview and arduino
spesification :
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2. min temp : 20 celcius (when temperature is under 20 celcius, heater ON)
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Please help me create VI file simulation.. I'm sorry I'm not fluent in English. May God bless you all
Attachments:
YOOOSHH.vi ‏88 KB

Duplicate thread. Please keep the discussion in that thread where you already have a response. It is also the more appropriate thread for your question.
Lynn

High Speed Clock Signal Generation Using FPGA Ouput

Hi,
This a screen shot of a LabVIEW FPGA program. Here I am trying to generate 5MHz Clock signal at Connector 0 DIO12. But I get around 2MHz when I measure the signal using an oscilloscope. Would some tell me what’s wrong ?
LabVIEW 2011
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I set DIO 12 to Nerver Arbitrate in the property setting.
Solved!
Go to Solution.

I'm not certain but maybe some of the delay is happening because you are changing the mode of the pin. According to the specs on the card it is capable of having a Maximum Clock Rate of 40MHz under the DIO section. So if you are purely doing digital reads, or digital writes you should be able to update/read 40,000,000 times a second. If you perform a read, which can take up to 1/40M of a second, then invert which takes some time but practically none, then another write which can take up to 1/40M of a second, your loop rate should still be faster than the 10MHz you showed. That's why I suspect there is time involved in changing over the pin from a read mode to a write.
If you try to do something similar with the analog you'll notice the maximum update rate is only 1MHz. So while your logic and code can run at 40MHz you can only update the analog value at 1MHz. Because of this in the past I have had two loops. One running a at the maximum clock rate doing the logic calculations, and then sending the result to another loop that updates the output at the maximum rate which in the case of an analog out is only 1MHz.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Is there any block in the Labview similar to that of clock block available in Matlab ?

Hi guys, i have generated a pulse in the matlab using the embedded block having some code in it and it takes the clock as one of it's input as shown in the figure.
Now i want to do the same in the Labview, but here i need a block which is exactly similar to that of the clock block used in Matlab.Kindly reply at the earliest. Thanks in advance.
Attachments:
2.jpg ‏33 KB
1.jpg ‏21 KB

The function you are looking for is available in LabVIEW Control Design and Simulation Module:
http://zone.ni.com/reference/en-XX/help/371894G-01/lvsim/sim_simulationtime/
This module is part of the Academic Version for LabVIEW.
Also, notice that your code from the competitor software has a 'implicit' loop around the formula node, which you can also do in LabVIEW by using:
1. Control and Simulation Node
2. Place it inside a simulation subsystem
3. Not using the Control Design and Simulation Module and using a For-loop around the node and controlling the time-step using index control (the 'i') and using multiply by a constant to simulate time. All this is abstrated inside the control and simulation loop, though.
One more thing... if you have the Module, look at the shipping examples under:
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Simulation
and look at the folder Utilities and Signal Generation. You should find those example exactly what you are trying to do.
Let me know if you have more questions.
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

AI Read sync'd to DAQCard-AI-16E-4 generated clock signal.

I need to read multiple (3) analog input channels on a DAQCard-AI-16E-4.
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Hi Don,
Couple of quick questions first
What sort of frequency do you want your loop to run at?
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Control analog output based on analog input

Dear forumers,
I am pretty new to the labview programming so excuse me if this was posted before.
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Please help :}.
I am attaching 2 examples.
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Attachments:
example-main.vi ‏180 KB
example-simple.vi ‏147 KB

nooto wrote:
Thank you for your suggestion.
I understand the simple arithmetic you are talking about. However I do not understand why it takes 20 seconds instead of 10 to complete the task. In other way to say - why it reads the whole input first (10 seconds) then write the output ( 10 seconds).
Why doesn't ir read and write simultaneously?
If I use Elapsed Time function - what feedback response time can I expect ? Is it good to use Elapsed Time if i need fast response time? In my application i would I need about 1 milisecond response time. Currently in the example the rate is 50 Hz, later I would like to change the rate to 1000.
You simply don't understand the underlying paradigm of LabVIEW -
dataflow. You have a dependency between the first DAQ Assistant and the
second. The second simply will not start until the first finishes. There
is no way around that given your condition that the output depends on
what you read.
If you want 1 millisecond response time then you will have to swithc to a real-time OS. Windows does not have that kind of resolution and there is way to much jitter.

Poor clock signal on REQ lines

I'm using a 6435 board to output digital patterns to my peripheral device. I'm using the REQ1 pin of my I/O connector for my peripheral's clock signal. When outputting my data, the clock signal looks really poor. I'm trying to get a clock speed of 5-10 Mhz. For that type of speed, what range of rise time should my eqipment be capable of for the clock? I'm also seeing a poor duty cycle, how can I get it close to 50%? I'm using my 6534 in a PXI chasis.
Thanks,
Sal

When generating an internal REQ signal, the asserted time of the resulting clock will be one period of the timebase used to generate the REQ.
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I
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How to input/output a digital signal and acquire an analog signal at the same time?

Dasylab, version: 8.0.04
Acquirement Card: PCI1002L
When I use DasyLab to acquire the analog signals is no problem without digital inputs and outputs,
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the problem is, if I set the Sampling rate to 5Hz, the speed of the acquirement datas is not enough for my
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so, how to improve it? who can give me a example programm for me. thanks!
by the way, I come from China, my English isn't good, I'm sorry.
Allen, China.

Hi,
Have things changed over the years?
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How to increase the length of the clock signals on NI8451

I'm using NI8451 to read data from a linear technology ADC chip.
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Are you using SPI or I2C?
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LabView Control System Engineer Job Opening - Seattle

LabView Control System Engineer Job Opening - Seattle
Seattle Safety is looking for a qualified individual to fill an
opening for Software Controls Engineer. Seattle Safety designs,
manufactures, and installs advanced crash test sled systems that are
used in automotive and aeronautical industries. The duties of the
Controls Engineer include:
Maintain existing control software code base, written in LabVIEW (including the Real-Time Module).
Improve existing software based on requirements and requests from customers and colleagues.
Troubleshoot and repair any functional software bugs that may arise.
Continuously investigate opportunities for system improvement through new or alternative hardware or software approaches.
Support installations of crash test equipment at on-site locations worldwide.
Provide technical support for team members locally and abroad
in subject matters concerning performance, installation, and
maintenance of software and data acquisition hardware.
Maintain professional relationships with suppliers and vendors in order to keep up with industry developments.
Furthermore, the ideal candidate would possess the following skills:
Beginner-to-intermediate knowledge of LabVIEW.
Passing understanding of binary logic.
Familiarity with at least one low-level programming language (Assembly, C, COBOL, etc)
Ability to analyze empirical data against theoretical predictions to enhance and improve mathematical model of system.
Familiarity with data acquisition concepts and hardware.
Ability to troubleshoot electrical and electronic systems at the module and equipment level.
Discipline and organization with respect to software
maintenance and version management. Experience with source
configuration management tools a plus (CVS, ClearCase, Perforce, etc.)
Experience with sophisticated high-speed feedback control systems
General skills in areas such as frequency domain analysis,
systems analysis, digital filtering, and both linear and non-linear
signal processing.
BSCS, BSEE, or BSCmpE are preferred but not required depending on experience.
Ability to work both alone and with colleagues to solve problems and to weigh the merits of differing approaches.
Pay is commensurate with skills and qualifications of the applicant.
Contact:
Seattle Safety
John Covey
(253)395-4321
822 3rd Ave S
Kent, WA 98032
[email protected]

Dear Sir / Madam,
I am an experienced engineering professional skilled in Post Silicon Validation by Automating using LabVIEW, Power Measurements, Jitter Measurement & Analysis, Audio Characterizations, Silicon Validation Test Cases, Multi-Channel Data acquisition and Triggering using NI DAQ Cards, Control Systems, Serial Communications using VISA and Serial I/O Interface, Code Native Interfaces, Call Library functions to interface with third party and custom dlls, ATMEL and PIC Micro Controller programming, Temperature Controllers like Honeywell, ESPEC-641, TestEquity 115, Hand held terminal programming to drive servo motors, C/C++/VB Programming for developing embedded applications.
Good experience on Windows API, protocol implementations, ARM11 & ARM7TDMI on-chip programming using Register Map and Pinout Specs using C/C++ Metrowerks Code Warrior and MULTI-ICE for ARM Debugger.
Looking for L1/H1 Job
Thank you for your time and consideration.
Please find an attachment of my resume in MS-Word format.
Sincerely yours,
K.Sowjanya. B.Tech
Message Edited by Support on 04-04-2008 08:39 AM

Senior LabVIEW Controls Engineer--GOLDEN, CO

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Overall fuelcell powerplant control system design, including integration with the vehicle control system
Computer modeling and simulation of hybrid powerplant operation
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Vehicle Projects Inc (since 1998), based in Denver/Golden, Colorado, serves the transportation industry by developing and demonstrating prototype hydrogen-fuelcell vehicles that address worldwide societal problems such as energy efficiency, energy security, and global climate change. Once a fuelcell prototype vehicle is built and tested, we provide it to industry for demonstration under working conditions.
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Industrial clients and co-funders of our projects have included Placer Dome Mining Company, Newmont Mining Corporation, Caterpillar, Mitsui & Co (Japan), and BNSF Railway Co. Government funders have included the US Department of Energy, US Department of Defense, National Institute of Occupational Safety and Health (NIOSH), Government of Canada, and Government of Japan.
Our state-of-the-art facility, constructed in 2007, is part of the burgeoning west-Denver (Golden) corridor of renewable-energy companies, including the nearby National Renewable Energy Laboratory (NREL). Metro Denver (www.metrodenver.org), with a population of three million, is a well-managed city located at the base of the Rocky Mountains. With an average annual temperature of 50 F, low humidity, and 300 days of sun, its moderate climate is one of many attractive features of the city. Its citizens are in the top national percentiles for fitness, health, and formal education.
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A person of the caliber we are seeking will receive an above-average salary, employment contract, and a generous benefits package, including profit sharing.
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I am a control systems engineer with 16 years of experience designing and building large systems using LabVIEW in Albuquerque NM and working currently for TEAM Technologies Inc. almost 15 years.
I hold a Master Degree in Space Power Systems graduated from Moscow Aerospace University.
I invented and implemented a message-driven and scripting controlled LabVIEW architecture which I presented couple times at NIWeeks, published in LTR, and local NI and ALVIN seminars. This architecture I was successfully used to develop projects for SNL (National Lab), WSTF (NASA), EMCORE, and etc. firms and organizations.
My expertise areas are: 1) Mechanical Engineering; 2) High Temperature Energy Converters; 3) Thermodynamics 4) Digital and Analog Electronics; 5) Programming: LabVIEW, C, embedded microprocessors (ARM, Cortex); Distributed hard real-time control with PXI and Compact RIO instrumentation.
I have published 45 scientific papers and have six patents.
I am NOT a certified NI LabVIEW programmer, because I believe that scientists and engineers has to have Degree Diploma only.
LabVIEW is just a programming tool nothing more.
Regards,
Youri Djachiachvili
Aerospace Engineer.
email: [email protected]

High-Level LabView Control System Engineer Job Opening - Seattle

High-Level LabView Control System Engineer Job Opening - Seattle
Seattle Safety is looking for a qualified individual to fill an opening for Senior Software Controls Engineer. Seattle Safety designs, manufactures, and installs advanced crash test sled systems that are used in automotive and aeronautical industries. The duties of the Controls Engineer include:
Maintain existing control software code base, written in LabVIEW (including the Real-Time Module).
Improve existing software based on requirements and requests from customers and colleagues.
Troubleshoot and repair any functional software bugs that may arise.
Continuously investigate opportunities for system improvement through new or alternative hardware or software approaches.
Support installations of crash test equipment at on-site locations worldwide.
Provide technical support for team members locally and abroad in subject matters concerning performance, installation, and maintenance of software and data acquisition hardware.
Maintain professional relationships with suppliers and vendors in order to keep up with industry developments.
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Intermediate-to-advanced knowledge of LabVIEW.
Ability to analyze empirical data against theoretical predictions to enhance and improve mathematical model of system.
Familiarity with data acquisition concepts and hardware.
Ability to troubleshoot electrical and electronic systems at the module and equipment level.
Discipline and organization with respect to software maintenance and version management. Experience with source configuration management tools a plus (CVS, ClearCase, Perforce, etc.)
Experience with sophisticated high-speed feedback control systems
General skills in areas such as frequency domain analysis, systems analysis, digital filtering, and both linear and non-linear signal processing.
BSEE, BSME or BS Physics may be a good fit, but not limited to these areas.
Ability to work both alone and with colleagues to solve problems and to weigh the merits of differing approaches.
Pay is commensurate with skills and qualifications of the applicant.
Contact:
Seattle Safety
Tom Wittmann
(253)395-4321
1222 6th Av N
Kent, WA 98032
[email protected]
Attachments:
ServoSled Brochure.pdf ‏1215 KB

Dear Sir / Madam,
I am an experienced engineering professional skilled in Post Silicon Validation by Automating using LabVIEW, Power Measurements, Jitter Measurement & Analysis, Audio Characterizations, Silicon Validation Test Cases, Multi-Channel Data acquisition and Triggering using NI DAQ Cards, Control Systems, Serial Communications using VISA and Serial I/O Interface, Code Native Interfaces, Call Library functions to interface with third party and custom dlls, ATMEL and PIC Micro Controller programming, Temperature Controllers like Honeywell, ESPEC-641, TestEquity 115, Hand held terminal programming to drive servo motors, C/C++/VB Programming for developing embedded applications.
Good experience on Windows API, protocol implementations, ARM11 & ARM7TDMI on-chip programming using Register Map and Pinout Specs using C/C++ Metrowerks Code Warrior and MULTI-ICE for ARM Debugger.
Looking for L1/H1 Job
Thank you for your time and consideration.
Please find an attachment of my resume in MS-Word format.
Sincerely yours,
K.Sowjanya. B.Tech
Message Edited by Support on 04-04-2008 08:39 AM

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