DHT22

SunshineGrrrl

Sorry this took so long.

sethigh is in this version here(I never updated after I posted the original):
http://www.missliss.org/code/dhtxx-0.9c.tar.gz

It's just a hastily cut and pasted(well copy and deleted) program that can set a pin high or low

CharlyDelta

Thanks to all of you for your help, i'll check those informations as soon as i have time

jneines

... just directly use the python driver from Adafruit, preventing subprocess calls and misinterpretations of the values. I use it myself for reading a dht22 and it works quite well. As i do not have it at hand at the moment i cannot provide a direct link, but you should be able to find it when searching ...

DougieLawson

CharlyDelta wrote:Any idea ?

How does it fail? Have you tried running it in a debugger like Adafruit's WebIDE http://learn.adafruit.com/webide

BTW, when you post python you MUST use [code][/code] tags or we lose all of the white space formatting (which is critical for python syntax).

CharlyDelta

Any idea ?

tonychang-uk

... for xWindows control Robot ARM by keyboard and Mouse. 14/01/2014 New update Ver Pi_Scratch v2.45 and User manual are ready for download now. 1.new DHT22 Digital Temperature & Humidity Sensor & IR-Trace Hunt sensor support 17/01/2014 New update Ver Pi_Scratch v2.47 and User manual are ready for ...

CharlyDelta

Hello.. I'm sing DHT22 temp and humidity sensor, Adafruit Driver and a link to GoogleDocs. All readings are ok when temperature is over 0 deg. C . As soon as the temperature drops below 0.5 C, readings are in 2 seconds instead of ...

tonychang-uk

... LCD module command 2. DC motor PWM improve update 14/01/2014 New update Ver Pi_Scratch v2.45 and User manual are ready for download now. 1.new DHT22 Digital Temperature & Humidity Sensor & IR-Trace Hunt sensor support 17/01/2014 New update Ver Pi_Scratch v2.47 and User manual are ready for ...

homerun4711

Hm, it was a hasty conclusion to say that everything works fine. The readout works better but still fails sometimes. This was only masked by the fact that the loldht-executable tries again immediately if the readout fails. Usually it worked on the second or third approach and the regex-parser then f...

homerun4711

... C-library (http://www.airspayce.com/mikem/bcm2835/) which the Adafruit driver is using. After crawling through some of the datasheets of the DHT22 / AM2302 I found that the read-out timing in the Adafruit software might not be correct. http://meteobox.tk/files/AM2302.pdf This is the best ...

homerun4711

... C-library (http://www.airspayce.com/mikem/bcm2835/) which the Adafruit driver is using. After crawling through some of the datasheets of the DHT22 / AM2302 I found that the read-out timing in the Adafruit software might not be correct. http://meteobox.tk/files/AM2302.pdf This is the best ...

Douglas6

I didn't mean to brush you off, just that Adafruit has very good support. Search their forum too. And try the solutions you found here. I'm guessing that library is just not ready for pi time.

I2C and SPI, being more standard, have better support in general.

homerun4711

... by Ivan. Indeed I am not familiar with SPI, I2C and other standards, thats why I chose to stick with point-to-point devices, for now. I bought the DHT22 at Adafruit, thats why I tried to use their software in the first place. After digging through the forum for a while I found out that many other ...

Douglas6

... red box at the top of the Adafruit tutorial ( http://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/overview ) for the DHT22 that says "This tutorial is a first attempt to develop a DHT interface driver. It is not guaranteed to work, and is for experimentation and hacking!" ...

FLYFISH TECHNOLOGIES

Hi Joe, Both devices are attached to the Pi's GPIO port: I don't have these devices, nor took a loook to the mentioned code... but decided to reply anyway... The reason is that people are in a hurry to implement some particular thing without being willing to take some "general knowledge" first... So...

homerun4711

Hello, I came across some problems while connecting devices to the GPIO and hope that you can help me. The devices are a AM2302 (DHT22) temperature/humidity sensor and a HD47780-compatible 16x2 LCD. My plan is to display the temperature and humitity on the LCD display Both devices are ...

n_dimos

Thanks for the response. It seems then that I have to buy a voltmeter. :| I can't seem to find the "SetHigh" code you mention. It is not in the .zip file uploaded by SunshineGrrrl. About the 5V0 instead of 3V3, I found this recommendation online too but another user had responded that you shouldn't ...

Dicedme

Hi, that was the same error i had and after extensive assistence from Sunshine Grrrl i found out my DHT22 was actually broken. I plugged a new one in and it worked first time. Things to check: -Ensure DHT22 is around the right way. -Use a voltmeter to check for a pin drop ...

n_dimos

Hello I had the same issue with the OP. With either the Adafruit_DHT or loldht I couldn't get my sensor to work. I downloaded the solution proposed by SunshineGrrrl. But now I am getting another error message reading: "ERROR: Pin never dropped"

I could use some insight here. Thanks for any help.

CharlyDelta

Finaly found the issue...Wrong language selection. Now I can get a graph of temp and humidity

CharlyDelta

Dougie, about format 123... any decimal I can choose print 41.430 The only way I can get something related to temperature is date format. All others do not work. http://img.imagesia.com/fichiers/d8/sheet_imagesia-com_d8wt_large.jpg and this is the code used : http://img.imagesia.com/fichiers/d8/code...

DougieLawson

In Google docs you can select a column and easily change the number formatting. Click on the column that needs to be changed. Click on the menu bar "123", select the format from there. It's a decimal number between -20.00 and 45.00 (assuming you're in an area with a normal climate, ie not the surfac...

DougieLawson

What does the raw data look like? Are you generating a spreadsheet from the RPi or a comma separated values file? Or something different? Dates and times in spreadsheets are normally done by assuming 1.0 is midnight on 1st Jan 0001. Decimal fractions are hours, so 0.25 is 6:00am, 0.5 is 12:00pm, 0.7...

CharlyDelta

Hello.. Googledocs print humidity and temperature. But the format of the temperature looking like a date format (05-05-2013) for 5.5 degrees C. As soon as the number is not a decimal, the number print normal. There's no way in googledocs where I can change the format to get the temperature in the go...

marcoraspberry

temperatura,umidità e altro. Con altro che intendi? Per temperatura e umidità un banale dht11 o dht22 andrebbero bene, sulla distanza però non so, con 5 metri di cavo non ho mai provato. Ti ringrazio allora mi accontento del sensore di temperatura all interno della casa ...

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