1-wire temperature in LabView

Hi
I'm trying to write a driver for 1-wire (www.ibutton.com) to LabView.
For starters I didn't have any contact at all! But now I can read the uniqe ID from temperature sensors connected to both my USB and my RS232 adapter.
And then the fun stops.
I can not communicate with the temperature chips (DS1920 & DS1822) I can't even get the IsTemperatureContainer to reply with a true.
Does anyone have the time to review my code and maybe suggest changes?
You can request a free samlpe at www.ibutton.com I recomend getting a DS1920 and a DS9490B for testing purposes, order sampels from here: http://www.maxim-ic.com/samplescart.cfm
You need to have the OWAPI installed (http://db.maxim-ic.com/ibutton/example/)......
But if you know a better way or can use one of the other API's please let me know. I just need to read the temperature, how it's done is not important (except it has to be done with LabView).
Please help, this is very urgent.
J;-)

I am trying to do the same with DS18S20.
I plan on using a DS2480 to convert 1-Wire to RS232.
I need to use simple ASCII commands which I plan to write a Automated test program in LabVIEW.
Should I get HA7E is a RS232 to 1-Wire interface? or can HA2 - RS232 1-Wire Host Adapter do the same function?
I have a DS1820 I need to use the CRC algorithm Specified by Dallas and
perform the following Tests:
Read 64 bit ROM of DS18S20, Resultant byte from CRC algorithm must match
the eight (last) byte of ROM.
Read 72 bit Scratchpad of DS18S20, Resultant byte from CRC algorithm must
match the ninth (last) byte of Scratchpad.
Next, I have to:
TH byte is downloaded from E2 memory to scratchpad. TH byte in scratchpad
is read.
TL byte is downloaded from E2 memory to scratchpad. TL byte in scratchpad
is read.
Finally, I need to read Temperature, which is read via data in
bytes 0,1,6 & 7 of the Scratchpad.
Can I accomplish this by MANUALLY typing the commands over the RS-232 Comm
Port from a PC?????
If anyone has any comments or am I taking the correct path? your help appreciated.
Thanks

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Can FieldPoint be configured for use with 4 wire temperature sensors?

I would like to build a fieldpoint-based measurement system that is configured to accept 4 wire type low temperature sensors, pressure sensors, and several 4 wire (100ma) magnetic hall sensors. Each 4 wire temperature and magnetic hall sensor will require a stable current source (20ma -100ma range). We need to be able to synchronously read up to 8 sensors. Under certain circumstances we would like update rates up to 50 Hz (0.02 seconds) on all 8 channels. We currently have FieldPoint products, such as FP-1001 modules (RS-485 Network Interface), FP AI-110 modules (8 channel, 16 bit analog input), FP-RTD-122 modules (8 channel RTD input), FP-RLY-420 modules (SPST Relay), FP-TB-1 (36 screw terminal, Universal Terminal Base), NI-SCC-68 (68 pin Terminal Block with 4SCC expansion slots), PCI-8431 (RS-485 Serial 2 Channel Card), and other FP modules on hand that we would like to use in this experiment design if possible. I would like more information on the NI FP-RTD-124, (4 wire, 8 ch., 16 bit RTD input module) regarding use with platinum RTDs and low level/low temperature signals, and maximum refresh rates. Thanks for your help,
LGF

Hi LGF. FP-RTD-124 info is here: (c)FP-RTD-124 manual.
The range of the -124 on the low end is -200C; we use it to -196C with 100 ohm Platinum sensors with good results.
The update rate, ~ 1S, however, is not going to meet your requirements. Can your temperatures really change that rapidly?
The excitation is fixed at 2mA x 135 mS with a period of 1S. Fine for an RTD, don't know about your Hall sensors.
Your AI-110 module can be configured to read the Hall sensors with external excitation but the maximum update rate is 0.173S.
Hope that helps.
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Xbee pro 60mw wire antenna and Labview guidance needed

I have some questions regarding zigbee and labview interface. I'm currently working on a project and this is my first time using zigbee and labview.
In my project, I want to transmit data wirelessly between two zigbees where data is the output that sensors generate by reading humans body temperature and heart rate(pulse).
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And this is kinda where I'm stuck at. My receiver(Xbee pro) is connected to ftdi then to PC using the USB cable. My transmitter(Xbee pro), sensors and microcontroller are connected to breadboard powered by lithium ion battery.
Could you please give me some tips or steps how you would go about using the labview at this point? Do you need some code for labview and zigbee interface?
I'm sort of new to this. If you can help, I would really appreaciate it.

I got stuck in this part. Can you check out the last reply I made in this forum : https://decibel.ni.com/content/message/49209
Also, from my receiver end(xbee pro) that is connected to PC through ftdi,
I was wondering how you would go about designing the serial communication from the receiver to Labview display.
The file attached is kind of thing I want to do. I have three major sensor data to display(heart rate, body temperature, and motion speed).
I want to show them to three graphical disaplay at the same time.
Can you give me some tips on designing the labview part? and also I would really appreacite if you could give me some tip on fixing the error I first stated in another forum. Refering any related forum would be helpful. Thanks a lot.
Sam,
Attachments:
reading data.vi ‏20 KB

Monitoring Thermocouple Temperature on Labview

In our project we are trying to get different temperature values from different thermocouples connected to our NI DAQ.When we run the program we get different temperature values from .xls file but we cannot monitor this different temperature values on Labview front panel's thermometer digital display .Even we connected different thermometers we get the same temperature value in all digital displays.Could you please help us to monitor different temperature values on digital display.
Solved!
Go to Solution.

Hey tata,
I think what you are looking for is the "Split Signals" VI, shown below in the code snippet. It lets you split the data wire into each of the corresponding thermocouple data values.
I hope that this helps.
Regards,
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How do I talk to 1-Wire devices with LabVIEW Real-Time?

Hello, I'm trying to use LabVIEW Real-Time to talk to some older 1-Wire devices that my company has previously communicated with using C code. We are currently developing on a cRIO and are trying to use a Dallas Semiconductor 2480 serial port device to talk to some iButtons and a secure SHA 1-Wire device. I have run into a few problems where the 1-Wire device stops communicating and just repeats the data sent to it. I was wondering if anyone has successfully created any VI's to talk with 1-Wire devices via the serial port that do NOT use any kind of Java or .NET or Windows based device drivers supplied by Dallas Semi. A last resort would be that we keep the C code and place it in a block in LabVIEW and run it as is but I would prefer to have some LabVIEW-native code. Any help would be greatly appreciated. Thanks.

Brian_T,
Thanks for that link about compiling a shared library for use on a VxWorks cRIO. The only thing they mention that I don't understand is this bit:
"GNU toolchain distributed with Wind River VxWorks"
I have been unable to locate a compiler for VxWorks so I am assuming that is located in this GNU toolchain thing? Does that come with the cRIO? I think I noticed a VxWorks C compiler somewhere else online but we're talking a totally different product I would have to purchase, assuming it would even work. I guess once the stub and the shared library are all good to go, I just call the C functions in the shared library and when it comes time to talk to the serial port, just slap a VISA Read/Write VI on the block diagram. I've been using a cRIO and COM1 access for some time now so I do understand at least that much. Let me know how to get ahold of this "toolchain" thing. Thanks.

Histéresis de temperatura en LabVIEW

Hola a todos.
Estoy haciendo un proyecto en el que uso una entrada que es un sensor de temperatura y tengo un problema al hacer un VI en el que haya un ciclo de histéresis que, por ejemplo, me encienda una caldera y si la temperatura supera 39,5 ºC se pare. La caldera no se volvería a encender hasta que la temperatura baje de los 36,5ºC, es decir, lo que viene siendo un ancho de histéresis. Les adjunto lo que tengo hecho para ver si me podían solucionar el problema (los estados se pueden obviar, ya que posiblemente los elimine).
¡Resuelto!
Ir a solución.
Adjuntos:
Proyecto curado de tabaco.zip ‏70 KB

Hola! Veo que ya te dierón una solución, pero me gustaria compartir otra opción de control con histeresis.
El "Histeresis negativa VI" es el control con histeresis. El Bloque CV VI es un ejemplo de como se utiliza.
SALUDOS.
Adjuntos:
Histeresis negativa VI.vi ‏17 KB
Bloque CV.vi ‏20 KB

Mantener una temperatura en labview

Necesito hacer un programa que me mantenga una temperatura y que no pase de cierto rango tambien que cada vez que eso pase me prenda un led, mientras que se esta graficando.
espero puedan ayudarme.

There is a function in the Programming >> Comparison palette called "In Range and Coerce.vi".
You can set an upper and lower temperature bound and the LED will stay lit as long as you are within the range.
Or if you want to know every time the temperature falls outside the range, just add a Not in front of the LED.
Cory K

1-wire temp.-sensor

Hi,
I'm using LabVIEW 7.0 and would like to read data from a DS18B20 1-wire temperature sensor. I use an adapter to connect the 1-wire BUS to the USB interface on my PC. Is there a possibility to use this sensor without buy an additional Labview library? And if it only works with this library, where can I buy it and how much is it?
If you have some experience with 1-wire and LabVIEW (maybe there are existing VI's), feel free to contact me.
Thanks,
Dennis
You're also welcome to answer in German...! ;-)

Don't know that any of these are specifically what you are looking for but they
might be good leads. I haven't used any of the DS USB adapters yet but I don't
expect it would be too difficult to put together a basic driver in LV.
Matt
NI:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=D3436B0F136A19B3E034080020E74861
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=C44EF95239243BF9E034080020E74861
non-NI:
http://embeddeddatasystems.com/page/EDS/PROD/SOFTWARE/SW-ONESIX

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I am interested in implementing the LabVIEW PID VI to create a temperature controller using the myRIO for a sous vide cooking apparatus similiar to this: https://learn.adafruit.com/sous-vide-powered-by-arduino-the-sous-viduino/sous-vide. I will be using a slow-cooker as the heating element; for the temperature measurements, I am using the DS18B20 one-wire temperature sensor; and to alter the temperature I am using a relay connected to the slow cooker.
I have had success getting temperature measurements from the DS18B20 with the myRIO following the guidance of this thread: https://decibel.ni.com/content/docs/DOC-41626#comment-44403, however, I am having difficulty finding a starting place to learn how to use the PID VIs for the rest of the project. In a new VI file, I used the program I had used for the temperature readings as a subVI, and tried to connect its output containing the live numerical temperature measurements into the PID VI, but the live temperature measurements as well as the PID VI output are not being transmitted after running the program.
Here are a few more specific questions:
Are there any preliminary steps for creating a PID program to accept live measurements from a myRIO target (should the program be enclosed in a loop for continuous updating of myRIO measurements)?
What information is transmitted at the "output" terminal of the PID VI?
Is autotuning recommended for this type of application?
How does the "PID Autotuning" VI differ from the "PID Autotuning (Temperature)" VI?
I have attached the files I am currently working with: ("1-wire interface.lvproj" is the project file, "RT Main.vi" is the temperature reading program, "PID_Test" is the new PID VI file I am experimenting with).
If the content in this post is not appropriate to what is expected to be asked in the forums (not specific enough, etc.), please let me know and I apologize in advance. Thank you for your time and assistance!

Hello dpull,
There shouldn’t be any particular configuration that needs to be done, for the PID vi to start using the PID VIs, and if you desire to continously acquire the data from the myRIO, then this within a loop might be appropriate.
The output terminal transmits the control signal of the PID controller, so basically the action that would have to take place to take the desired value to the setpoint.
As far as recommending autotuning, it mostly depends on your application and the precision you need, it would always be better to determine the parameters yourself, but if you don’t require super high accuracy, then autotunning should be sufficient.
The PID autotunning (Temperature) VI is used for processes that include a dead time, since it’s incorporated into that model, the other one is better suited for processes that don’t have dead time.
As far as resources go for learning to use this toolkit, I’d recommend sticking to the examples you can find in LabVIEW and maybe the following manual.
http://www.ni.com/pdf/manuals/372192d.pdf

ActiveX COM issue in new LabVIEW instance

I have a rather peculiar problem I'm running into with using a COM library from a company to read proprietary binary files. I'm not very familiar with this type of Labview programming, I just followed their examples and experimented, a lot. I have talked for hours with the software engineer at the company who provides the "FSCOM Server" as they call it (Orbit F/R) and he can't figure out what is going on either. His expertise is not in Labview, but in text-based languages (I had to explain how to wire things in Labview over the phone).
I use this FSCOM to read the contents of antenna pattern files stored in a binary format (frustrating). Everything works fine and as expected after weeks of experimenting and direction from Orbit. The problem is when I shut down Labview completely and open the code in a brand new instance, I run it on a data file and It errors out with "The server threw an exception." The weird part is nothing has changed from when it worked 30 seconds ago when I was programming it before I shut down Labview. The way to get it working again? Delete just 1 wire somewhere, anywhere then re-wire it. Now it works, everytime.
Does anyone that knows COM/ActiveX have any idea how I can get this to work so I can make it an executable to distribute to other workstations?
PS. It currently won't run in executable form, I've tried.
Jamie
Attachments:
FileSystemCOM_Server_1.x.zip ‏4115 KB
folder.zip ‏502 KB
Block Diagram.png ‏286 KB

Thank you for the tips, like I said I'm new to ActiveX objects so it's good to know how to properly handle them. I was using the attached code as my example on how to use their COM server so anymore information on how to use them or if they were not following a "best practice" is welcome.
However, I don't think the closing references out of order explains this problem because when the code works, as in when I delete a wire and re-wire it, it works perfectly.
If I open it in a fresh Labview, it won't get past case structure "4" (Read Azimuth / Elevation Angles) as in it doesn't seem to successfully read the data file as that is the first bit that looks inside the actual file. This made me think its a file/COM server issue which is why I spent over an hour on the phone yesterday with the developer of this COM server and he actually re-created this problem. Sadly he couldn't figure out why it would work if you just played with the wires a bit first.
So this is why I'm here to see if there is anything blatently wrong with how I'm doing this according to Labview standards and not MatLab or some other languages' standards. I'm hoping that whenever you or someone else gets a minute to try my .vi's they will run into the same problem and can maybe direct from there.
It is a strange thing to have working code, but only if you change it first.
Also I know this would be a lot cleaner if the case structures were subvi's instead but I tried that when I first started programming this and couldn't get the reference of the COM Server to read out/read in correctly from on subvi to the next. I wired it up like I do any other vi and like so many NI drivers are out there, but it wouldn't work with this COM server and I just had to get it working so I moved on. I may revist the subvi aspect later after its built and working for everyone and just make it an update later to clean up the code a bit.
Jamie
Attachments:
FSCOM Example - BD.png ‏67 KB

NI PXI 4351 read temperature

Hi,
I'm trying to read temperature from TBX-68T connected to NI PXI-4351.
I see PXI-4351 in my hardware explorer, it show me right data in test panel.
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http://joule.ni.com/nidu/cds/view/p/id/285/lang/en
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JaredRo wrote:
Hi kmcdevitt,
The SC Express product family was specifically designed to take advantage of the PXIe architecture and therefore the timing circuitry on the PXIe-4353 is not designed to be compatible with the PXI platform. There are no plans to design any of the SC Express products in the PXI form factor.
Jared,
Please explain what it is that makes the PXIe-4353 so special that there can not be a PXI-4353.
This 32-Channel, 24-Bit, Thermocouple Input Module does 90 S/s/ch sample rate in high-speed mode or 1 S/s/ch sample rate in high-resolution mode. Surely you are not claming the the PXI platform's architecture and timing circuitry can not hadle the troughput generated by the 32 channels of 24bit data at 90Hz.
Jared, it is not a pleasent fealing to be prommised that the new signal conditioning cards are going to be made for your soon to be purchased PXI-1045 chassises, and later find out from an Applications Engineer Jared that it has been in the plans to never make PXI versions of signal conditioning cards. How would you feel if you purchased about 30 PXI-1045 18 slot chassises with PXI Embedded RT controllers with the promiss that if you bought the controllers and chassises that NI would continue to develope new Signal Conditioning and Other PXI Cards for your chassises. Just buy them, and the new PXI cards will come. How would you feel when you were told to be patient and just wait till next years NI week. How patient would you be after the second year of being told to be patient until the next year's NI week? How patient would you be after the third year of being told to be patient until the next year's NI week? I have been recently asked to be patient again. NI Week 2012, there may be something. And now you tell me that there will never be anything.
I just don't buy it that there is something about the PXIe architecture and therefore the timing circuitry that is required for 90 Hz data.
Kevin.

Changing Colour Display for Temperature Distribution

Hi everyone,
I am currently involved in reading a series of temperatures along a length of pipe as part of an experiment. I thought it would be a nice touch for my VI to have a diagram of the pipe which changes colour to show the temperature distribution along it.
I have attached my initial solution. I would have posted a VI snippet but this seemed to effect the my references in the property nodes.
Issues
The code 'works' in the sense that the foreground colour of each tab control will change based on the value of the corresponding temperature.
The solution does not scale well. I need 'n-1' case structures for 'n' colours/temperatures. I considered using an enum input to a single case structure, but was not sure how to compare this to the for loop index.
Unsure whether changing a tab control background is the most efficient way to do this. Not sure of an alternative.
I am looking for suggestions as to how to do this more efficiently as there will be up to 16 temperatures in the final system.
Many thanks in advance,
Pete
Regards,
Peter D
Attachments:
Temperature Display.vi ‏16 KB

Tabs are probably the weirdest choice here. Why not use e.g. a simple colorbox or button?
In any case, try to learn about autoindexing, it will dramatically simplify your code (see attached in yellow box).
I probably would use an array of clusters, each containing a colorbox and a numeric with transparent background. Modify as needed. (see attached in green box).
Of course you probably would want to make it a it prettier than my draft.
For a larger ramp, I would use a plain array of flat colorboxes. Now simply index into a color ramp to generate it according to your temperatures.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Temperature DisplayMOD.vi ‏18 KB

Watlow F4 Controller with LabView

Hello all,
I have a HX300 circulating chiller that uses a Watlow F4 controller. I want to control the F4 controller and monitor the conditions from it such as pressure rate and temperature using LabView. I heard of the Modbus driver that helps make this communication possible and have downloaded it. I am using the LabView 8.6 version and followed the necessary steps to include it into Labview. I have very little experience with Labview and am wondering how to begin writing the code for this. Any help is very much appreciated!
Thank you,
Eric
Solved!
Go to Solution.
Attachments:
labview 86.zip ‏1900 KB

Start here:
http://www.ni.com/gettingstarted/labviewbasics/
and here:
http://www.ni.com/academic/students/learn/
and here:
http://labviewwiki.org/LabVIEW_tutorial#External_Links
And if you have an active SSP here:
http://sine.ni.com/myni/self-paced-training/app/main.xhtml
After all of that open the Examples in the code you posted and see if they work.
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If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

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Sehr geehrter Herr Frey,
sind sie noch immer auf der suche nach Unterstüzung im Bereich LabView. Ich habe im Rahem des Studium mehrer LabView-Anwendungen umgesetzt. Im Rahmen der Diplomarbeit habe ich eine Steuerung für eine Biogasanlage entwickelt. Die Steuerung erfolgt mittels Siemens-SPS. Auf die SPS greift eine Visualisierung, die in LabView erstellt wurde, mittels OPC zu. Es wurde ein Datenlogger auf Basis LabView entwickelt, der Analgendaten in eine MS-Access datenbank schreibt und eine Datenanalysierung die diese Daten wieder aus der Datenbank liest (Zeitraum einstellbar) und darstellt oder nach Excel transferieren kann.
Ich arbeite in einer kleine Elektrofirma im Eichsfeld und habe in den letzten Jahren viel Erfahrung im Bereich SPS-Programmierung (Siemens S7 und Phoenix) sammeln können. Wir sin aber auch auf der Suche nach neuen Herausforderungen und so sind wir hier auf ihren Eintrag gestoßen.
Wenn wir ihr Intresse wecken konnten, dann besuchen sie doch unsere Internetseite.
http://www.emsr-technik.info
http://www.rug-emsr-technik.de
Sie können darüber auch jederzeit Kontakt mit uns aufnehmen.
MfG
Frank Röhreich

Resistance to temperature

Hi,
I need to accept the resistance and convert that to temperature in Labview. Cn some one give me the formula.
Actualy I need to get the temperature below 73K. But my RTD (FP-RTD-122) has data configuration as 73k - 1123k and not below 73k.
So i hv to do this is the labview program by accepting the resistance (0-400 ohms) and convert to temperature.
Thanks in advance.

To clarify, this topic is a duplicate to the one linked above.
Trey B
Applications Engineering
National Instruments

1-wire temperature in LabView

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