Problems with SHT11 sensor
i recently purchased·the SHT11 temp/humid sensor for a senior·project and it seems to be giving a temp reading of around 32F and an RHtrue value of 109.5%.· This is impossible.· I put a hair drier on it and the temp does go up along with the RH value.·I have no clue what the problem is and in desperate need of help.·thanks
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Comments
What code are you using? Post it here or give us a reference. If there is a raw result value that comes back, it can sometimes help if you insert a DEBUG statement for that in the program. That helps to isolate the problem to before or after the computations.
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Tracy Allen
www.emesystems.com
The link below will show you the code and how the sensor is wired.
http://www.parallax.com/dl/docs/prod/acc/SensirionDocs.pdf
I am not familiar with PBasic what do you mean by enter a DEBUG statement
thanks
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- Stephen
By DEBUG for the raw values, I am looking at this subroutine in the program listed in the pdf:
That should display raw iobytes on your screen along with calculated values. What do you see? At that point you will take the raw values and calculate temperature and humidity and compare results with the ones that the stamp has calculated. If they are different, you look at the code, if they are the same (and boh wrong), then you look at the hardware connection and the low level acquisition routine.
The main thing is for you to understand how the chip and the program work!
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Tracy Allen
www.emesystems.com