Hi all.
I'm trying to connect my USB scale on my Ubuntu 12.04 but i have some problems.
I will explain step by step my procedure*:
- open a terminal
- connect the scale
- in terminal*: lsusb*: Bus 002 Device 005: ID 0fff:0001 Aopen, Inc.*: good news
- compile and run the C program on post 5*: the compilation works and the program said*: «*reading values*»*: good news
- when i had put the scale on my computer, the LCD display «*LOAD*» …
- i have try to put myself on the scale but the program had any reactions …

The scale model is KAW-410 USB and my aim is just to keep the results in a file txt.

Try this from the terminal:
And post results

Also, before "reading values" you should be getting the name of your scale displayed.

Hi,
Thanks for your answer !
i have not the USB scale at this time.
But i remember when i connect the scale and run the program, i could see the name of the USB scale before "reading values".
In memory, the result of "ls -l /dev/usb/hiddev*" is "hiddev0".

(sorry for my english, i'm french user ..)

No worries, I'm not a native English speaker either. You should try to confirm that the scale is actually generating values by doing this:
Press CTRL+C to interrupt it.
Make sure that the scale is turned on and weighting something while you do that.

Then view the file with your favorite editor to see if anything was saved, there should be a whole bunch of random looking characters.

Hi.
i have tryed the commands into last post but the test fails i think.
After typing command-line : sudo cat /dev/usb/hiddev0 >testing_scale.bin, i try to put myself on the scale but not reaction with the Scale (the LCD displays "LOAD") ...
After, i interrupted the process with Ctrl+C and see the content of the file testing_scale.bin with vi editor.
It's an empty file ...
When i type dmesg command-line, i can see this model :
[ 4174.544035] usb 6-2: new low-speed USB device number 2 using uhci_hcd
[ 4174.737490] generic-usb 0003:0FFF:0001.0003: hiddev0,hidraw2: USB HID v1.00 Device [SONiX Transtek-Scale v3] on usb-0000:00:1d.0-2/input0

What's happen ?

It almost looks to me like you need to send something to your scale in order to initialize it. You will have to use some USB sniffing software on Windows to check if the driver sends something to the scale. It should not be too difficult with the right software.
Here is a free one : http://usbsnoop.sourceforge.net/
Let us know how it went.

Hi.
I have tryed some softs to snif USB port ..
USBSnoop has some problems to display interface. When i run the program, the interface alway blinking ... i have tried xp-compatibilty mode but nothing change ...
I tried 2 others softs : usblyzer and an other.
I can seen datas (HEXA datas) when i put the scale into the USB port. But, when i try to put myself on the scale, no reaction, no logs ...
I think, the USB-scale can't communicate in live with the OS ..
I googled to find a USB Scale with usb live communication but i don't find any model. I find usb postal-scale only !
Have you some models of USB weighing scale ?

Does the scale work on windows? Do you have a windows software for it?

Hi.
Ya, the scale works on Windows XP/7 and i have a specific software on a CDROM : "Body Scale" (the EXE name is FatScaleUsb.exe)

up :]

Have-you a model name with real-time display results on the Computer ?
i can't find model on web with this feature !!!

.. up ?!
Can you gives me some usb scales supported by your program ?