[SOLVED] DHT22 not reading

(Jaka Smode) #1

Hello
I’m having a trouble reading temperature from DHT22 sensor(script in running fine in command line), what i’'ve done so far:

Items are named home.items

Number Temp “Temperature [%.1f °C]” {exec="<[/usr/bin/python /etc/openhab2/scripts/DHT22.py:10000:REGEX((.*?))]"}

script is named DHT22.py(script is working 100%)

import Adafruit_DHT

sensor = Adafruit_DHT.DHT11
pin = 4
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
if humidity is not None and temperature is not None:
print(’{0:0.2f}’.format(temperature))
else:
print(‘Failed to get reading. Try again!’)

image

sitemap

Text item=Temp

what is showing up in the basic ui
image

thank you in advance
Jaka

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(Rich Koshak) #2

Please use code fences.

Logs?

Does the script work when run as the openhab user?

sudo -u openhab python DHT22.py

See How to solve Exec binding problems for other trouble shooting ideas.

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(Jaka Smode) #3

okay i’ve tried

sudo -u openhab python DHT22.py

image
and it does not work.

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(Mark) #4

Aren’t you in the /etc/openhab2 directory trying to run a script in the /etc/openhab2/scripts directory?

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(Jaka Smode) #5

thank you, I haven’t noticed that mistake now the command works

sudo -u openhab python DHT22.py

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(Jaka Smode) #6

Do I need any specific bindings?
And here I found some errors for Temp in log.

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(Rich Koshak) #7

The errors in the log indicate you have a line in your sitemap to display the Item Temp but there is no such Item defined.

Check for typos in your .items file. Try a restart of OH just to be sure you are starting from a cleanish state.

Do you see the .items file Temp is defined in loading in openhab.log? Any errors during the loading of that file?

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(Jaka Smode) #8

Rebooted the Pi and there were no temp errors in sight.

In items I have this:

Number Temp “Temperature [%.1f °C]” {exec="<[/usr/bin/python /etc/openhab2/scripts/DHT22.py:10000:REGEX((.*?))]"}

and in sitemap

Text item=Temp icon=“temperature”

Could you confirm that the syntax is correct?

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(Rich Koshak) #9

No but openHAB itself and VSCode with the openHAB extension can. If you don’t see any errors in openhab.log when it loads the file, there are no syntax errors.

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