Testing a DHT22 Temp/Humidity Sensor on a Raspberry Pi

Article on DHT22: pimylifeup.com/raspberry-pi-h...
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#raspberrypi #dht22

[@user-jg4qs8ee2j]

Thank you I really solved it because of your video.

[@Sideeffection]

Thanks, it worked. With other tutorials I kept getting buffer error.

[@Sam-tg4ii]

The reason for the delay is that the sensor sometimes gives None readings and the code is not printing those Nones. So it's not delay in reading but omission of invalid readings.I don't know why the Nones happen but it's not a fault with the adafruit library because I get the same thing (actually worse) when I use the dht11 library from PyPI

[@WhitbyStuff]

You did well to get it to work. I got error after error. I wish it had been as plain-sailing as it was for you.

[@tbunreall]

Yes I get unknown platform error

[@bbblop4545]

It doesn't work properly anymore. The adafruit started raising an runtime error "Unknown platform". Uninstalled the library and when trying to install it again it errors out saying it "Could not detect if running on the Raspberry Pi or Beaglebone Black"

[@criticaltechcode4866]

Have you tried to use "read" function insted of "read_retry"?

[@medaho]

Hi
@RickMakes Can i control the temperature and the humidity of a warehouse of 1500m2 with such devices (sensors and raspberri pi).
Also,which sensors and raspberri pi models do you recommend for such a warehouse?

[@Rickmakes]

You could potentially use something like this but you can get a thermostat with those features pretty cheap and they tend to be very reliable.

[@medaho]

@@Rickmakes So from my understanding,i should get more reliable sensors than the DHT22 Temp/Humidity Sensor.
Thank you.

[@medaho]

@@Rickmakes Thank you for your reply.
So from my understanding,I should use more reliable sensors than the DHT22 Temp/Humidity Sensor.

[@assuke]

the issue with csv file is because the file is already open with a process (python), to fix it you wanna open the file, write and close it.

[@Dozentt]

Error to install
pi@raspberrypi:~ $ python3 humidity.py
Traceback (most recent call last):
File "/home/pi/humidity.py", line 1, in
import Adafruit_DHT
ModuleNotFoundError: No module named 'Adafruit_DHT'

[@shazzy6380]

Try this command :
pip install Adafruit-DHT

[@miquelmarti6537]

Maybe you have to sleep for some seconds between loops