sensirion ek-h5 or Humidity Sensor SHT21 for labview

[usuario]

Dear all,

I have a Sensirion evaluation kit for humidity and temperature measurement, with selfmade visualizer; but I want to acquire data via LabView.

There is LV code for ek-h4, but not for ek-h5.

Has anyone developed code for ek-h4?

Of course, LV code for the sensor itself would also be very appreciated (sht21).

Any other suggestions?

Usuario

[Danny_Funk]

Usuario,

We have instrument drivers for the sht71 and sht 75. There is a discussion forum where another customer was able to tweak these drivers to work with their sht11 and a NI usb-6009.

http://forums.ni.com/t5/LabVIEW/sht11-and-ni-usb-6009/m-p/1629364?requireLogin=False

Danny Funk

Applications Engineer

[usuario]

Hello Danny,

Thank you, I had already seen the post about sh11 and 6009, this will be my second option if I don't succed, but preffered to check for ek-h5 or sht21 drivers.

Seems as there are no drivers available nor self-built .vi from other users.

[ADeller]

I'm afraid I do not have an answer, however I would just like to register my interest in solving the same issue.

[Danny_Funk]

ADeller and Usuario

Sorry but we only have drivers for the sht71 and sht75. Therefore attempting to modify them is your best bet.

Danny Funk

[SnowyEleven]

ADeller and Usuario, Did you have any luck making modifications to enable a driver for the SHT21?

Danny F, do you know if any Labview drivers have been created for the SHT21 in the time since ADeller and Usario's posts?

I have the same need. Thanks.

[Danny_Funk]

SnowyEleven,

Drivers specifically for the SHT21 have not been created. All of our drivers can be found at the following link http://www.ni.com/devzone/idnet/. Take note that there is a spot to request a driver at the top of the page.

Regards,

Danny F

[claudeuntel]

Hi,

I have written a LabView code to retrieve temperature and humidity from Sensirion's SHT75 sensor, through their Evaluation Kit EK-H5.

The USB Dongle is in fact a modified version of Code Mercenaries's USB Dongle including a IOWarrior24 micro-controller, and a +3.3V power supply. It can be talked to using a modified version of the iowkit.dll developped by Code Mercenaries. This needed DLL is included in Sensirion's Viewer software (installer @ http://www.sensirion.com/fileadmin/user ... _V2.12.msi).

The code can be readily modified for other Sensirion sensors by modifying some commands in the sub VI's.

However, I still don't know how to read or write the "status register" of the SHT75 sensor.

[M__L]

@ claudeuntel

thank you very much!

Works well with the Evaluation Kit EK-H5 and the SHT21 on LV2014 SP1

[M__L]

Sorry for the fast hype....

The Vi does not work with the SHT21.

Communication works but the conversion from the measured RH% and T values is not correct.

I did put in the conversion math from the SHT21 datasheet but it doesnt work either.

Probably the USB-dongle does need to recieve some other commands to work with the SHT21 but until now I couldnt figure it out.

Does anybody have another solution?