Best way to chain several I2C write / read cycles

Hi,
I'm developing a custom sensor that communicates over I2C with the NXT.
I need to perform sequencially several read / write actions over I2C.
I know that the NXT toolkit is limited to only one frame sequences and that is possible to chain them with "pink NXT wires" or "any other wire".
I've tried several times but I only get the first frame working. The other aren't executed.
Does anyone here has enough experience or advices to perform several I2C operations sequencially in the same VI.
Many thanks in advance.

What version of LabVIEW / NXT Module are you using?
The most recent LVLM supports multi-frame stacked sequences.
Take a look at the ultrasonic sensor block diagram, it has a configure step followed by actually reading the data.
One problem can be trying to read/write the i2c channel too fast. You may need to insert some arbitrary wait times in between sequential i2c calls.
If you post your code it might be easier to tell whats not working.

Similar Messages

I am moving from PC to Mac. My PC has two internal drives and I have a 3Tb external. What is best way to move the data from the internal drives to Mac and the best way to make the external drive read write without losing data

I am moving from PC to Mac. My PC has two internal drives and I have a 3Tb external. What is best way to move the data from the internal drives to Mac and the best way to make the external drive read write without losing data

Paragon even has non-destriuctive conversion utility if you do want to change drive.
Hard to imagine using 3TB that isn't NTFS. Mac uses GPT for default partition type as well as HFS+
www.paragon-software.com
Some general Apple Help www.apple.com/support/
Also,
Mac OS X Help
http://www.apple.com/support/macbasics/
Isolating Issues in Mac OS
http://support.apple.com/kb/TS1388
https://www.apple.com/support/osx/
https://www.apple.com/support/quickassist/
http://www.apple.com/support/mac101/help/
http://www.apple.com/support/mac101/tour/
Get Help with your Product
http://docs.info.apple.com/article.html?artnum=304725
Apple Mac App Store
https://discussions.apple.com/community/mac_app_store/using_mac_apple_store
How to Buy Mac OS X Mountain Lion/Lion
http://www.apple.com/osx/how-to-upgrade/
TimeMachine 101
https://support.apple.com/kb/HT1427
http://www.apple.com/support/timemachine
Mac OS X Community
https://discussions.apple.com/community/mac_os

Best way to organize several versions of Photoshop Elements to conserve disk space?

I have Elements 9, 11, and now Version 12. I am wondering if I should import into Version 12's Organizer all of my previous photo files, then delete or uninstall the older versions of PhotoShop Elements?
Currently running Windows 7 - 64 bit with latest SP installed. I would like to try and keep the hard disk storage fairly lean, and can't help but wonder about the space that is being taken up by having all of these versions of Elements installed! Any advice would be welcome. Thanks for your replies and insights!
BrokenBell

Thank you so much for your input! I sometimes feel that I must be increditable stupid as I try to get BOTH organized but also learn how to use all of the features found in Photoshop Elements. Part of the reason that I say this, is because I have always been pressed for time, so I try & do one most pressing thing, that usually doesn't turn out quite like it was described it would or could be, and then I'm off to take care of more pressing issues, and don't get back to trying it after days or weeks have passed, so its kinda of like starting all over again.
Again, thanks for your reply and input!
Sincerely,
Clyde [email protected]
Date: Tue, 14 Jan 2014 14:31:09 -0800
From: [email protected]
To: [email protected]
Subject: Best way to organize several versions of Photoshop Elements to conserve disk space?
    Re: Best way to organize several versions of Photoshop Elements to conserve disk space?
    created by nealeh in Photoshop Elements - View the full discussion
The organizer does not store your photos, only links to their locations on the hard disk. So all your different versions will be looking at the same image file, so no duplication of the photos themselves.
If you find yourself using features in 9 or 11 that were removed in later versions (e.g. interactive photomerge, magic extractor, lighting effects etc ...) I'd be inclined to leave them installed unless you are critically short of disk space.
Cheers,
Neale
Insanity is hereditary, you get it from your children
If this post or another user's post resolves the original issue, please mark the posts as correct and/or helpful accordingly. This helps other users with similar trouble get answers to their questions quicker. Thanks.
     Please note that the Adobe Forums do not accept email attachments. If you want to embed a screen image in your message please visit the thread in the forum to embed the image at http://forums.adobe.com/message/6013170#6013170
     Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: http://forums.adobe.com/message/6013170#6013170
     To unsubscribe from this thread, please visit the message page at http://forums.adobe.com/message/6013170#6013170. In the Actions box on the right, click the Stop Email Notifications link.
           Start a new discussion in Photoshop Elements at Adobe Community
For more information about maintaining your forum email notifications please go to http://forums.adobe.com/thread/416458?tstart=0.

I2C Write/Read Error

Error -301742 occurred at NI-845x I2C Write Read.vi
"Possible reason(s):NI-845x: The slave did not acknowledge an address+direction byte transmitted by the I2C master. Reasons include the incorrect address set in the I2C configuration or the incorrect use of the 7-bit address. When entering an address to access a 7-bit device, do not include the direction bit. The NI-845x Basic I2C API internally sets the direction bit to the correct value, depending on the function (write or read). If your datasheet specfies the 7-bit device address as a byte, discard the direction bit (bit 0) and right-shift the byte value by one to create the 7-bit address."
We have connected the pull up resistors on the SDA and SCL line.
The error seems to be strange in our case,
We have two setup
1. Using a push button to power the device and wires through the pull up resistor.
2. We are trying to communicate using a NI 2569 for the SDA and SLC and the Power supply to the device.
We do not observe the error in case 1,however, in case 2 we do observe,attached are the waveform pics for the same.
Noted that we have the clock signal rise delay in case 2, is this because of the relay 2569?
Any help will be highly appreciated.
Regards,
Naru
Attachments:
Case 1.jpg ‏302 KB
Case 2.jpg ‏302 KB

I don't quite understand your setup, and I'm not sure what I'm looking at with the figures you posted. What does the 2569 have to do with the 8451? You also said
1. Using a push button to power the device and wires through the pull up resistor.
I have no idea what this means.
It's hard to tell from the pictures, but for the Case 1 figure, it appears that you are generating a correct start condition. It's also indicating that are sending a read transaction. You didn't indicate what device you're talking to, so we can't say for sure if this is correct.
In the second case it also appears that you generating a correct start condition. The slow rise times that you are seeing in the clock is probably due to extra capacitance on the bus, or weak pullups, or both. This transaction appears to be a write transaction, but with no data.
At this point, without knowing what device you're talking to, a better explanation of your setup, and the code itself, I'm not sure how much help we can be.

Need help - I2C write/read with TAOS TCS3414 light sensor using USB-8451

Hello, I'm new to labview and need help setting up a vi that will allow me to communicate with a digital light sensor (TAOS TCS3414) using a USB-8451. I need to use the sensor to measure light from a light source that I designed and built as part of a project im working on. I've tried looking at several labview I2C exampled but find them to be very confusing. I've used an arduino to interface with the sensor successfully but need to use labview and dont understand how to write the program. The actions are simple; I need initialize the sensor with a simple command and then request data from 8 data registers and then read that data. The data will then be used in further calculations. The portion i need help with is writing and reading from the sensor. I've attached the datasheet for the sensor as a guide. I can also provide the arduino code that i use to read data from the sensor if that would help.
Pleae keep in mind that i am completely new to labVIEW. I really do want to learn from this but need quick results so the more help the better. It would greately appreciate any help or explaination.
Attachments:
TCS3414_Datasheet_EN_v1.pdf ‏1806 KB

Hi Aaron,
Here you go, this is made with a USB-8452.
When you run the code tick the power en dac enable box on.
Maybe you can help me with my problem, I want to use a fiber to sense light from a led.
Do you use any fiber hardware with the TCS3414?
gr,
Attachments:
TCS3414.vi ‏63 KB

Best way to handle several events that may occur simultaneosly

Hi all,
I have an application vi in which I need to take care of several user generated events like menu bar selections, mouse clicks on controls (both single & double clicks) and many more.Also, all these events can occur simultaneously.Which would be the best method or architecture to handle all these events with ease?..All suggestions are welcome.
Can I use dynamic event handling for this?..If so,how can I implement it? (I went through several documents & examples for dynamic handling but none of them explained properly in this context).

mnx wrote:
[..] several user generated events like menu bar selections, mouse clicks on controls (both single & double clicks) and many more.Also, all these events can occur simultaneously.[...]
Hm, can you enlighten us how a user will create these events simultaneously?
Or maybe i am a bad user as i always use either mouse OR keyboard to control an application, most often not both the same time (starting different "events" concurrently).
Beside of this discussion, Producer/Consumer is a very good starting point to address this kind of requirement, as already stated above.
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

What is the best way to have several opt depends for a single feature

Hello,
I'm the current maintainer of the shutter-bzr PKGBUILD: https://aur.archlinux.org/packages.php?ID=30671 In the current version I added several opt depends that are all needed for a single feature: Dropbox upload. Currently all the opt depends are listed separately, each of them stating "Dropbox upload support" as the additional feature they are needed for. Is there a way to merge opt depends to a single entry in such a case? What is the preferred way to manage such a case (I couldn't find anything like this in the PKGBUILD creation guidelines)?
Thanks,
PhotonX

If you have a form on the detail view of the web app and you populate the fields, lets say "Product name" with the actual tag of the name as the value of the input. Then that will auto populate.
Since the user does not need to edit it you can even hide the field because its auto populated.

Best way to make all the items read-only in many pages for a resposibility?

Hi,
We have the following requirement:
We need to make all the fields read-only in 5 standard self-service pages for a particular responsibility. One way is to personalize these pages at responsibility level. Is there any other quick/better way to do it?
Highly appreciate your suggestions on this.
thanks,
Hem

Hem,
Personalisation is easiest and fastest way of doing this. The same requirement can be acheieved by extensions of CO by setting the bean properties rr by SPEL binding by extending VO.
But when I can get something done without coding at all that approach is best, I am sure u agree :)!
--Mukul

Best way to select several mysql table rows at random?

What is the best and quickest way to have one form button select multiple rows from a table with complete randomness?
Can you also offer some explanation (or link to a good tutorial)- I am a beginner in myql and php.
thanks
p.s. the id column in my table is auto incrementing and has some gaps (due to deletions of records). I do not want any of those gaps to be chosen at random (can they?).

What do you have so far? How many rows will your table have and how many do you want to randomize? To produce random result without filter will put a strain on your server, especially if you have a lot of rows and you get a lot of server requests (pageloads). To randomize the results you basically have to recreate the table dynamically then output the result as an array. Again, this will put a huge load on your server. This may sound silly and ridiculously obvious, but have you tried searching the obvious term on google for MySQL random? There are millions of articles that describe the subject. Many first page results will show you exactly what you need to do. Try searching first then if you have trouble ask here, referencing the article you followed by first searching google.
best,
Shocker

Looking for best way to convert 35 mm slides to digital images

Hello Apple Community,
Am researching best ways to convert several hundred 35 mm slides into digital images. There are numerous scanners/converters out there but want to ensure I get the best unit compatable with my iMac (27 inch, Late 2009). Any suggestions welcome.

For scanning 35mm slides you need a scanner with a good photometric resolution and geometric resolution.
For the photometric resolution: Get a scanner with a high density range (D-max) value, to get a good resolution of highlights and shadows.
For the geometric resolution - sharpness and detail - try to get at least 3200 dp,i to be able to get good 8"x10" prints from your scanned slides, a higher dpi value, if you want to be able to print larger images.

Whats the best way to get dvd onto 5800

Peoples,
I'm strugglin to get DVD onto my noka 5800. It's not obvious in the user manual and looking around the web i need to 'convert' it to the fim on.
Please does anybody have an easy, fool proof way of doing this??????
Message Edited by blueleaches on 21-Aug-2009 06:02 PM

If its possible there should be some walkthrough's on google.
http://www.lmgtfy.com/?q=whats+the+best+way+to+get+dvd+onto+5800

Best way for read and write?

Hello
I'm working on project with labview .
with this program i connecting PC to the MCU through sreial RTU modbus .
in this program there are some data need to be read and some data need to write .
what i need is most of my time reading polet exuted exept when some of control element (like edit box) has changed by user .
when ever some thing changed by user write polet excuted .
now what is the best way to do this ?
Best Regards.
Solved!
Go to Solution.

mori64 wrote:
What uou said sound complicated to me .
i'm trying to undrestand your solution .
i'll be happy if you upload sample program .
State Machine
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

What is the best way to write 10 channels of data each sampled at 4kHz to file?

Hi everyone,
I have developed a vi with about 8 AI channels and 2 AO channels... The vi uses a number of parallel while loops to acquire, process, and display continous data.. All data are read at 400 points per loop interation and all synchronously sampled at 4kHz...
My questions is: Which is the best way of writing the data to file? The "Write Measurement To File.vi" or low-level "open/create file" and "close file" functions? From my understanding there are limitations with both approaches, which I have outlines below..
The "Write Measurement To File.vi" is simple to use and closes the file after each interation so if the program crashes not all data would necessary be lost; however, the fact it closes and opens the file after each iteration consumes the processor and takes time... This may cause lags or data to be lost, which I absolutely do not want..
The low-level "open/create file" and "close file" functions involves a bit more coding, but does not require the file to be closed/opened after each iteration; so processor consumption is reduced and associated lag due to continuous open/close operations will not occur.. However, if the program crashes while data is being acquired ALL data in the buffer yet to be written will be lost... This is risky to me...
Does anyone have any comments or suggestions about which way I should go?... At the end of the day, I want to be able to start/stop the write to file process within a running while loop... To do this can the opn/create file and close file functions even be used (as they will need to be inside a while loop)?
I think I am ok with the coding... Just the some help to clarify which direction I should go and the pros and cons for each...
Regards,
Jack
Attachments:
TMS [PXI] FINAL DONE.vi ‏338 KB

One thing you have not mentioned is how you are consuming the data after you save it. Your solution should be compatible with whatever software you are using at both ends.
Your data rate (40kS/s) is relatively slow. You can achieve it using just about any format from ASCII, to raw binary and TDMS, provided you keep your file open and close operations out of the write loop. I would recommend a producer/consumer architecture to decouple the data collection from the data writing. This may not be necessary at the low rates you are using, but it is good practice and would enable you to scale to hardware limited speeds.
TDMS was designed for logging and is a safe format (<fullDisclosure> I am a National Instruments employee </fullDisclosure> ). If you are worried about power failures, you should flush it after every write operation, since TDMS can buffer data and write it in larger chunks to give better performance and smaller file sizes. This will make it slower, but should not be an issue at your write speeds. Make sure you read up on the use of TDMS and how and when it buffers data so you can make sure your implementation does what you would like it to do.
If you have further questions, let us know.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Best way to merge multiple iPhoto libraries from several external hard drives into one, while deleting duplicates?

Problem: My wife and I both have MacBook Pros (MBPs). We take a lot of pictures and import them into iPhoto. When the storage capacity of our MBPs gets full, I have been moving our iPhoto libraries into external hard drives, which are now multiple (3 or 4). The problem I now realize we have been making, is that once the iPhoto libraries were copied onto the external hard drives, we were only deleting about half of the photos in each iPhoto library remaining in our MBPs (because we wanted to keep some of the important ones in our hard drives). Once the storage capacities of our MBPs got full again, I would repeat the whole process again and again. In essence I now have several large iPhoto libraries (each about 80 GB), each with multiple duplicate photos, divided among several external hard drives. And I am running out of space on my hard drive again. So what is the best way to:
a) merge all of these iPhoto libraries into just one, while simultaneously being able to delete all the duplicates? (or would you not recommend this?)
b) prevent this from happening again?
Thanks. BTW I am using OS X Mountain Lion 10.8.5 and iPhoto 8.1.2 (2009)

If you have Aperture 3.3 or later and iPhoto 9.3 or later you can merge libraries with Aperture.
Otherwise the only way to merge Libraries is with the paid ($30) version of iPhoto Library Manager
The Library Manager app can be set avoid duplicates.

Best way to write SELECT statement

Hi,
I am selecting fields from one table, and need to use two fields on that table to look up additional fields in two other tables.
I do not want to use a VIEW to do this.
I need to keep all records in the original selection, yet I've been told that it's not good practice to use LEFT OUTER joins. What I really need to do is multiple LEFT OUTER joins.
What is the best way to write this? Please reply with actual code.
I could use 3 internal tables, where the second 2 use "FOR ALL ENTRIES" to obtain the additional data. But then how do I append the 2 internal tables back to the first? I've been told it's bad practice to use nested loops as well.
Thanks.

Hi,
in your case having 2 internal table to update the one internal tables.
do the following steps:
*get the records from tables
sort: itab1 by key field, "Sorting by key is very important
      itab2 by key field. "Same key which is used for where condition is used here
loop at itab1 into wa_tab1.
read itab2 into wa_tab2     " This sets the sy-tabix
       with key key field = wa_tab1-key field
       binary search.
if sy-subrc = 0.              "Does not enter the inner loop
    v_kna1_index = sy-tabix.
    loop at itab2 into wa_tab2 from v_kna1_index. "Avoiding Where clause
      if wa_tab2-keyfield <> wa_tab1-key field. "This checks whether to exit out of loop
        exit.
      endif.
****** Your Actual logic within inner loop ******
   endloop. "itab2 Loop
endif.
endloop. " itab1 Loop
Refer the link also you can get idea about the Parallel Cursor - Loop Processing.
http://wiki.sdn.sap.com/wiki/display/Snippets/CopyofABAPCodeforParallelCursor-Loop+Processing
Regards,
Dhina..

Best way to chain several I2C write / read cycles

Similar Messages

Maybe you are looking for