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DHT22 not found
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DHT22 not found

by ohnomrbill on Thu Jul 30, 2020 10:09 pm

Upgraded to circuitpython and DHT22 stopped working. Error message: DHT sensor not found, check wiring

Version.sh follows:
git:/opt/scripts/:[b39ec679648a6be8f25f48bd1c9784c1fc5a0c46]
eeprom:[A335BNLT000B1114BBBK1616]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Buster IoT Image 2020-04-06]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2019.04-00002-g07d5700e21]:[location: dd MBR]
UBOOT: Booted Device-Tree:[am335x-boneblack-uboot-univ.dts]
UBOOT: Loaded Overlay:[AM335X-PRU-RPROC-4-19-TI-00A0]
UBOOT: Loaded Overlay:[BB-ADC-00A0]
UBOOT: Loaded Overlay:[BB-BONE-eMMC1-01-00A0]
UBOOT: Loaded Overlay:[BB-HDMI-TDA998x-00A0]
kernel:[4.19.94-ti-r42]
nodejs:[v10.15.2]
/boot/uEnv.txt Settings:
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-19-TI-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg check: to individually upgrade run: [sudo apt install --only-upgrade <pkg>]
pkg:[bb-cape-overlays]:[4.14.20200722.0-0~buster+20200722]
pkg:[bb-wl18xx-firmware]:[1.20200702.0-0~buster+20200702]
pkg:[kmod]:[26-1]
pkg:[librobotcontrol]:[1.0.5-git20200715.0-0~buster+20200716]
pkg:[firmware-ti-connectivity]:[20190717-2rcnee1~buster+20200305]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal bluetooth netdev i2c gpio pwm eqep remoteproc admin spi iio docker tisdk weston-launch xenomai cloud9ide]
cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet]
dmesg | grep remote
[ 55.801451] remoteproc remoteproc0: wkup_m3 is available
[ 55.821468] remoteproc remoteproc0: powering up wkup_m3
[ 55.821498] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168
[ 55.821781] remoteproc remoteproc0: remote processor wkup_m3 is now up
[ 59.067926] remoteproc remoteproc1: 4a334000.pru is available
[ 59.082608] remoteproc remoteproc2: 4a338000.pru is available
dmesg | grep pru
[ 59.067926] remoteproc remoteproc1: 4a334000.pru is available
[ 59.068111] pru-rproc 4a334000.pru: PRU rproc node pru@4a334000 probed successfully
[ 59.082608] remoteproc remoteproc2: 4a338000.pru is available
[ 59.082760] pru-rproc 4a338000.pru: PRU rproc node pru@4a338000 probed successfully
dmesg | grep pinctrl-single
[ 0.949342] pinctrl-single 44e10800.pinmux: 142 pins, size 568
dmesg | grep gpio-of-helper
[ 0.962565] gpio-of-helper ocp:cape-universal: ready
lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
END

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by drewfustini on Thu Jul 30, 2020 10:53 pm

Could you please post a photo of the wiring?

Thanks,
drew

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by ohnomrbill on Fri Jul 31, 2020 8:02 am

py code:
import board
import time
import adafruit_dht
import datetime

#pin = 'P8_11' GPIO_45
dhtDevice = adafruit_dht.DHT22(board.P8_11)
#get time stamp which is GMT
timestamp = datetime.datetime.now().strftime('%Y-%m-%d/%H:%M:%S')

# location zipcode
loc = '75214'
temp_f=0.
humidity=0.
print ('X={}_{}_{}_{}'.format(timestamp,temp_f, humidity, loc))

i=1
#try five times to get a reading
while (i!=5):
try:
temp_f=(dhtDevice.temperature*1.8)+32
humidity=dhtDevice.humidity
print("Temp: {:.1f} F Humidity: {}% ".format(temp_f, humidity))
break
except RuntimeError as error:
print(error.args[0])
i=i+1
time.sleep(2.0)
#
Attachments
2020-07-31_06-37-28.jpg
2020-07-31_06-37-28.jpg (881.41 KiB) Viewed 303 times

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by drewfustini on Sun Aug 02, 2020 1:53 pm

Thanks for posting the photo.

I'm waiting for a DHT22 to arrive so I can reproduce the issue and find a solution.

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by ohnomrbill on Sun Aug 02, 2020 2:01 pm

thank you....

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by ohnomrbill on Fri Aug 14, 2020 8:46 am

any update?

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by drewfustini on Sat Aug 15, 2020 11:18 am

Hi, sorry for the delay, I finally have to part and should be able to try it out this evening. Thank you for your patience.

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by drewfustini on Fri Aug 21, 2020 6:13 pm

I have been able to reproduce the same issue you are experiencing. I have not yet been able to determine why the CircuitPython DHT22 library does not work on the BeagleBone Black.

However, the deprecated Python library does work:
https://github.com/adafruit/Adafruit_Python_DHT

Could you please give this a try?
Code: Select all | TOGGLE FULL SIZE
sudo apt-get install build-essential python-dev
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
cd Adafruit_Python_DHT
sudo python3 ./setup.py install
cd examples/
sudo python3 ./AdafruitDHT.py 22 P8_11

Here are the results I get:
Code: Select all | TOGGLE FULL SIZE
debian@beaglebone:~/Adafruit_Python_DHT/examples$ sudo python3 ./AdafruitDHT.py 22 P8_11
Temp=28.0*  Humidity=53.2%

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by ohnomrbill on Mon Aug 24, 2020 8:39 am

thank you... will test as soon as I can get a free moment... Will post results.

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by ohnomrbill on Tue Aug 25, 2020 5:51 pm

ImportError: cannot import name 'Beaglebone_Black_Driver' from 'Adafruit_DHT' (/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/__init__.py)

when running "python3 ./AdafruitDHT.py 22 P8_11" under su.

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by drewfustini on Tue Aug 25, 2020 8:31 pm

Did the setup run ok?

Could you paste the entire output of running the commands?

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by ohnomrbill on Tue Aug 25, 2020 10:29 pm

reran install, since I had logged off:

root@BBB-B2:/usr/src/AM2302/Adafruit_Python_DHT# python3 ./setup.py install
running install
running bdist_egg
running egg_info
writing Adafruit_DHT.egg-info/PKG-INFO
writing dependency_links to Adafruit_DHT.egg-info/dependency_links.txt
writing top-level names to Adafruit_DHT.egg-info/top_level.txt
reading manifest file 'Adafruit_DHT.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'Adafruit_DHT.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-armv7l/egg
running install_lib
running build_py
running build_ext
creating build/bdist.linux-armv7l/egg
creating build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/common.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/Test.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/Beaglebone_Black_Driver.cpython-37m-arm-linux-gnueabihf.so -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/Raspberry_Pi_2.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/Beaglebone_Black.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/__init__.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/Raspberry_Pi.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
copying build/lib.linux-armv7l-3.7/Adafruit_DHT/platform_detect.py -> build/bdist.linux-armv7l/egg/Adafruit_DHT
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/common.py to common.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Test.py to Test.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi_2.py to Raspberry_Pi_2.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Beaglebone_Black.py to Beaglebone_Black.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/__init__.py to __init__.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Raspberry_Pi.py to Raspberry_Pi.cpython-37.pyc
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/platform_detect.py to platform_detect.cpython-37.pyc
creating stub loader for Adafruit_DHT/Beaglebone_Black_Driver.cpython-37m-arm-linux-gnueabihf.so
byte-compiling build/bdist.linux-armv7l/egg/Adafruit_DHT/Beaglebone_Black_Driver.py to Beaglebone_Black_Driver.cpython-37.pyc
creating build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/PKG-INFO -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/SOURCES.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/dependency_links.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying Adafruit_DHT.egg-info/top_level.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
writing build/bdist.linux-armv7l/egg/EGG-INFO/native_libs.txt
zip_safe flag not set; analyzing archive contents...
Adafruit_DHT.__pycache__.Beaglebone_Black_Driver.cpython-37: module references __file__
creating 'dist/Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg' and adding 'build/bdist.linux-armv7l/egg' to it
removing 'build/bdist.linux-armv7l/egg' (and everything under it)
Processing Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg
removing '/usr/local/lib/python3.7/dist-packages/Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg' (and everything under it)
creating /usr/local/lib/python3.7/dist-packages/Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg
Extracting Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg to /usr/local/lib/python3.7/dist-packages
Adafruit-DHT 1.4.0 is already the active version in easy-install.pth

Installed /usr/local/lib/python3.7/dist-packages/Adafruit_DHT-1.4.0-py3.7-linux-armv7l.egg
Processing dependencies for Adafruit-DHT==1.4.0
Finished processing dependencies for Adafruit-DHT==1.4.0

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by drewfustini on Wed Aug 26, 2020 3:52 pm

Thanks, that is odd that it reports no errors but the script does not run.
Could you run this and paste the full output?
Code: Select all | TOGGLE FULL SIZE
cd examples/
sudo python3 ./AdafruitDHT.py 22 P8_11


thanks,
drew

drewfustini
 
Posts: 944
Joined: Sat Dec 26, 2015 1:19 pm

Re: DHT22 not found

by ohnomrbill on Wed Aug 26, 2020 7:49 pm

root@BBB-B2:/usr/src/AM2302/Adafruit_Python_DHT/examples# python3 ./AdafruitDHT.py 22 P8_11
Traceback (most recent call last):
File "./AdafruitDHT.py", line 41, in <module>
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
File "/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/common.py", line 94, in read_retry
humidity, temperature = read(sensor, pin, platform)
File "/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/common.py", line 80, in read
platform = get_platform()
File "/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/common.py", line 60, in get_platform
from . import Beaglebone_Black
File "/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/Beaglebone_Black.py", line 24, in <module>
from . import Beaglebone_Black_Driver as driver
ImportError: cannot import name 'Beaglebone_Black_Driver' from 'Adafruit_DHT' (/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/__init__.py)

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Re: DHT22 not found

by ohnomrbill on Thu Aug 27, 2020 2:38 pm

Problem Fixed...
Started with a clean debian image, update, then upgrade. Installed archived version of DHT package. Successful run of example..

ohnomrbill
 
Posts: 44
Joined: Sat Jan 30, 2016 5:03 pm

Please be positive and constructive with your questions and comments.