DHT22 unable to view readings #424

New Issue

2021-06-14T09:57:33+01:00

davbcr commented

2021-06-14 09:57:33 +01:00

(Migrated from github.com)

Despite proper configuration of the plugin it's not able to show any readings from DHT22 properly connected and working.

SUDO in advanced settings is disabled
getDHTTemp.py is below:

import sys
import Adafruit_DHT

Parse command line parameters.

sensor_args = { '11': Adafruit_DHT.DHT11,
'22': Adafruit_DHT.DHT22,
'2302': Adafruit_DHT.AM2302 }
if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
sensor = sensor_args[sys.argv[1]]
pin = sys.argv[2]
else:
sys.exit(1)

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin,2,0.5)

if humidity is not None and temperature is not None:
print('{0:0.1f} | {1:0.1f}'.format(temperature, humidity))
else:
print('-1 | -1')

sys.exit(1)

Can you help me modify getDHTTemp.py to get readings? i've noticed that with the script of Raspcontroller App here attached it works.
dht_v6.txt

Despite proper configuration of the plugin it's not able to show any readings from DHT22 properly connected and working. ![image](https://user-images.githubusercontent.com/72738177/121865791-a52ecf80-ccfe-11eb-8176-2105df2a1ae6.png) ![image](https://user-images.githubusercontent.com/72738177/121865911-c099da80-ccfe-11eb-80b0-3fcb0a31ee4b.png) SUDO in advanced settings is disabled getDHTTemp.py is below: import sys import Adafruit_DHT # Parse command line parameters. sensor_args = { '11': Adafruit_DHT.DHT11, '22': Adafruit_DHT.DHT22, '2302': Adafruit_DHT.AM2302 } if len(sys.argv) == 3 and sys.argv[1] in sensor_args: sensor = sensor_args[sys.argv[1]] pin = sys.argv[2] else: sys.exit(1) humidity, temperature = Adafruit_DHT.read_retry(sensor, pin,2,0.5) if humidity is not None and temperature is not None: print('{0:0.1f} | {1:0.1f}'.format(temperature, humidity)) else: print('-1 | -1') sys.exit(1) Can you help me modify getDHTTemp.py to get readings? i've noticed that with the script of Raspcontroller App here attached it works. [dht_v6.txt](https://github.com/vitormhenrique/OctoPrint-Enclosure/files/6646952/dht_v6.txt)

noz1380 commented

2021-06-15 13:39:41 +01:00

(Migrated from github.com)

I have the same issue, and wanting to fix. I'm not sure if this is still supported?

I have read that there is a change in an update, and adafruit dont support the old DHT, but the newer Adafruit_CircuitPython_DHT

https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht

I have the same issue, and wanting to fix. I'm not sure if this is still supported? I have read that there is a change in an update, and adafruit dont support the old DHT, but the newer Adafruit_CircuitPython_DHT https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht

noz1380 commented

2021-06-15 13:56:53 +01:00

(Migrated from github.com)

Please take a look at this thread.

https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht

I added this line as per the instructions

elif match.group(1) == 'BCM2711':
return 3

It works!!------Sorry it works on command line, which is better than I had before.

But not in Octoprint.

Please take a look at this thread. https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht I added this line as per the instructions elif match.group(1) == 'BCM2711': return 3 It works!!------Sorry it works on command line, which is better than I had before. But not in Octoprint.

davbcr commented

2021-06-15 16:11:28 +01:00

(Migrated from github.com)

Please take a look at this thread.

https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht

I added this line as per the instructions

elif match.group(1) == 'BCM2711':
return 3

It works!!------Sorry it works on command line, which is better than I had before.

But not in Octoprint.

Mee too. it's not working via Octoprint.
I've tried also to add import Adafruit_CircuitPython_DHT into gettempdht.py but it seems needed a different configuration of the file.....and i get it not to work from command line either, rolling back stuck again.

> Please take a look at this thread. > > https://stackoverflow.com/questions/63232072/cannot-import-name-beaglebone-black-driver-from-adafruit-dht > > I added this line as per the instructions > > elif match.group(1) == 'BCM2711': > return 3 > > It works!!------Sorry it works on command line, which is better than I had before. > > But not in Octoprint. Mee too. it's not working via Octoprint. I've tried also to add import Adafruit_CircuitPython_DHT into gettempdht.py but it seems needed a different configuration of the file.....and i get it not to work from command line either, rolling back stuck again.

noz1380 commented

2021-06-15 18:50:09 +01:00

(Migrated from github.com)

What I cant figure out is that the example code to show temp and humidity (sudo ./AdafruitDHT.py 2302 4) in terminal is pretty much identical to the code in "getDHTTemp.py" which leads me to think there is a problem elsewhere.

unsplorer commented

2021-07-10 19:41:19 +01:00

(Migrated from github.com)

I'm running OctoPrint in a docker container and was able to resolve this issue by installing the newer Adafruit_CircuitPython_DHT library and python3 inside the container. I had to adjust the call to getDHTTemp.py inside octoprint_enclosures init.py to use python3. I then had to modifiy getDHTTemp.py for the newer CircuitPython library as follows :

 import adafruit_dht
 from board import D19 #my sensor is connected to D19 on RPi. adjust your pin accordingly
 import time

 # Parse command line parameters.
 sensor_args = { '11': adafruit_dht.DHT11,
     '22': adafruit_dht.DHT22}
 #        '2302': Adafruit_DHT.AM2302 } depreciated
 if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
     sensor = sensor_args[sys.argv[1]]
     pin = sys.argv[2] #ignoring this for testing purposes
 else:
     sys.exit(1)

 dht_device = adafruit_dht.DHT22(D19)

 read_attempts = 0
 while read_attempts < 7: # try for a reading 7 times since dht's are unreliable
        try:
                humidity = dht_device.humidity
                temperature = dht_device.temperature

                if humidity is not None and temperature is not None:
                    print('{0:0.1f} | {1:0.1f}'.format(temperature, humidity))
                    sys.exit(1)
        except RuntimeError as error:
                read_attempts += 1
                time.sleep(2.0)
                continue
        except Exception as error:
                read_attempts += 1
                dht_device.exit()
                raise error

        time.sleep(2.0)

 print('-1 | -1')
 sys.exit(1)

I'm running OctoPrint in a docker container and was able to resolve this issue by installing the newer Adafruit_CircuitPython_DHT library and python3 inside the container. I had to adjust the call to getDHTTemp.py inside octoprint_enclosures __init__.py to use python3. I then had to modifiy getDHTTemp.py for the newer CircuitPython library as follows : ```import sys import adafruit_dht from board import D19 #my sensor is connected to D19 on RPi. adjust your pin accordingly import time # Parse command line parameters. sensor_args = { '11': adafruit_dht.DHT11, '22': adafruit_dht.DHT22} # '2302': Adafruit_DHT.AM2302 } depreciated if len(sys.argv) == 3 and sys.argv[1] in sensor_args: sensor = sensor_args[sys.argv[1]] pin = sys.argv[2] #ignoring this for testing purposes else: sys.exit(1) dht_device = adafruit_dht.DHT22(D19) read_attempts = 0 while read_attempts < 7: # try for a reading 7 times since dht's are unreliable try: humidity = dht_device.humidity temperature = dht_device.temperature if humidity is not None and temperature is not None: print('{0:0.1f} | {1:0.1f}'.format(temperature, humidity)) sys.exit(1) except RuntimeError as error: read_attempts += 1 time.sleep(2.0) continue except Exception as error: read_attempts += 1 dht_device.exit() raise error time.sleep(2.0) print('-1 | -1') sys.exit(1)

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Reference: Gandalf/OctoPrint-Enclosure#424