Problems with DHT sensor platorm

Valiceemo · December 11, 2017, 2:41pm

I had an old DHT11 sensor so I thought id hook it directly to my Pi3 to give me a rough means to monitor the ambient temperature around all my media gear. Here is the entry in my config

sensor:
  platform: dht
  name: 'DHT11 sensor'
  sensor: DHT11
  pin: 4
  monitored_conditions:
    - temperature
    - humidity

But im getting errors in my log and the sensor does not show?

2017-12-10 23:37:29 ERROR (MainThread) [homeassistant.components.sensor] Error on device update!
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity_component.py", line 217, in async_add_entity yield from entity.async_device_update(warning=False)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity.py", line 306, in async_device_update
    yield from self.hass.async_add_job(self.update)                                       
  File "/usr/lib/python3.5/asyncio/futures.py", line 380, in __iter__
    yield self  # This tells Task to wait for completion.                                   
  File "/usr/lib/python3.5/asyncio/tasks.py", line 304, in _wakeup
    future.result()                                                                         
  File "/usr/lib/python3.5/asyncio/futures.py", line 293, in result
    raise self._exception                                                                   
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)                                             
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 125, in update self.dht_client.update()                                                                
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/util/__init__.py", line 306, in wrapper result = method(*args, **kwargs)                                                        
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 160, in update self.sensor, self.pin)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 94, in read_retry humidity, temperature = read(sensor, pin, platform)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 81, in read return platform.read(sensor, pin)                                                       
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/Raspberry_Pi_2.py", line 34, in read raise RuntimeError('Error accessing GPIO.')
RuntimeError: Error accessing GPIO.                                                      
2017-12-10 23:37:29 ERROR (MainThread) [homeassistant.components.sensor] Error on device update!                                                                                    
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity_component.py", line 217, in async_add_entity
    yield from entity.async_device_update(warning=False)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity.py", line 306, in async_device_update
    yield from self.hass.async_add_job(self.update)
  File "/usr/lib/python3.5/asyncio/futures.py", line 380, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 304, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 293, in result
    raise self._exception
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 125, in update
    self.dht_client.update()
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/util/__init__.py", line 306, in wrapper
    result = method(*args, **kwargs)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 160, in update
    self.sensor, self.pin)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 94, in read_retry
    humidity, temperature = read(sensor, pin, platform)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 81, in read
    return platform.read(sensor, pin)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/Raspberry_Pi_2.py", line 34, in read
    raise RuntimeError('Error accessing GPIO.')
RuntimeError: Error accessing GPIO.
2017-12-11 02:48:30 ERROR (Thread-35) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 02:48:30 ERROR (Thread-26) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 04:30:13 ERROR (Thread-25) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 04:30:15 ERROR (Thread-34) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 05:30:11 ERROR (Thread-5) [homeassistant.components.sensor.speedtest] Error executing speedtest: Command '['/srv/homeassistant/bin/python3', '/srv/homeassistant/lib/python3.5/site-packages/speedtest.py', '--simple']' returned non-zero exit status 1
2017-12-11 06:00:08 ERROR (Thread-26) [pychromecast.socket_client] Error reading from socket.
2017-12-11 06:00:08 ERROR (Thread-35) [pychromecast.socket_client] Error reading from socket.
2017-12-11 06:00:38 ERROR (Thread-26) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 06:00:38 ERROR (Thread-35) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 06:00:47 ERROR (Thread-25) [pychromecast.socket_client] Failed to connect, retrying in 5.0s
2017-12-11 12:00:11 ERROR (Thread-14) [homeassistant.components.sensor.speedtest] Error executing speedtest: Command '['/srv/homeassistant/bin/python3', '/srv/homeassistant/lib/python3.5/site-packages/speedtest.py', '--simple']' returned non-zero exit status 1

Bit-River · December 11, 2017, 8:22pm

Looks like mine. Though out of curiosity, does it work without the name line?

  name: 'DHT11 sensor'

That’s one bit mine doesn’t have. Other than that I guess perhaps the pin number?

Valiceemo · December 11, 2017, 9:18pm

If I remove the name I still don’t see the sensor in my front end.
I’ve highlighted which pin the dht11 is attached to. Which is 4? Just to make sure I haven’t made a stupid schoolboy error.
Is the error regard gpio access the problem here?

Bit-River · December 11, 2017, 10:19pm

Yeah, looks right to me.

I use pin 14, the one just above.

Is it the sensor itself maybe?

I can vouch for the DHT22 being a great replacement!

Valiceemo · December 11, 2017, 10:32pm

I’m really not sure.
The sender was working when last used so don’t see any reason it’d stop working

googanhiem · December 12, 2017, 12:15pm

I think I may have a similar problem. I have tried installing a working DHT22 (tested with the Adafruit_DHT, both python2.7 and unofficial python3.5 releases) on a Raspberry Pi B+. The pin is correct.

I’m using Raspbian Stretch with Homeassistant 0.59.1 installed in a python virtual env.

Every time I try to boot the device I release the below error.

   Tue Dec 12 2017 10:43:00 GMT+0000 (GMT Standard Time)

Error on device update!
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity_component.py", line 217, in async_add_entity
    yield from entity.async_device_update(warning=False)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/helpers/entity.py", line 306, in async_device_update
    yield from self.hass.async_add_job(self.update)
  File "/usr/lib/python3.5/asyncio/futures.py", line 380, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 304, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 293, in result
    raise self._exception
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 125, in update
    self.dht_client.update()
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/util/__init__.py", line 306, in wrapper
    result = method(*args, **kwargs)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/sensor/dht.py", line 160, in update
    self.sensor, self.pin)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 94, in read_retry
    humidity, temperature = read(sensor, pin, platform)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/common.py", line 81, in read
    return platform.read(sensor, pin)
  File "/srv/homeassistant/lib/python3.5/site-packages/Adafruit_DHT/Raspberry_Pi_2.py", line 34, in read
    raise RuntimeError('Error accessing GPIO.')
RuntimeError: Error accessing GPIO.

I’ve tried editing the Adafruit_DHT files in the HA virtualenv. It shouldn’t be a GPIO permissions issue as they are not needed post Jessie.

I assume there are issues with the Adafruit_DHT implementation that HA is using, is there anyway in changing this, or testing it?

Bit-River · December 12, 2017, 2:00pm

That lines up with my working ones, which are running an older version of Hassbian with HA 0.57 on it.

googanhiem · December 12, 2017, 3:07pm

Have you tried installing Adafruit DHT on its own and test the sensor

cd ~
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
cd Adafruit_Python_DHT
sudo python3 setup.py install

and test it using

cd examples
adafruit_dht.py 11 4

I might try changing the dht.py requirements, and delete the current adafruit_dht python package

REQUIREMENTS = ['https://github.com/adafruit/Adafruit_Python_DHT']

Valiceemo · December 12, 2017, 3:56pm

I haven’t tried using the Adafruit library since upgrading to Stretch.
But I did use it whilst on Jessie lite and it worked fine.

I guess I can try that later.

What do you mean by this…change what and how and to what?

googanhiem · December 12, 2017, 4:24pm

When the DHT component is loaded up by HA it installs the required adafruit_DHT program. I think the one currently in the requirements is incorrect and causing issues with GPIO interface,

This fork i’ve made has the requirements change https://github.com/googanhiem/home-assistant/blob/dev/homeassistant/components/sensor/dht.py

Still haven’t tested it.

Valiceemo · December 13, 2017, 8:42am

I installed the Adafruit library via git-clone etc and it works OK, so I think you are correct.
Have you filed an issue?

How can I test your changes?

googanhiem · December 13, 2017, 9:12am

I’ve tested the changes, and they didn’t work. For some reason HA using adafruit_dht isn’t able to communicate with the GPIO pins.

I’m going to try a couple other things, but I’m out of ideas.

I’ve written a binary sensor using adafruit_dht example script to act as a stopgap, I’ll share that once its stable.

Valiceemo · December 13, 2017, 9:42am

Ah OK, most strange

I was planning on writing a simple python programme that would read the temp sensor every x minutes and send it to HA using MQTT (paho)
But im interested in your binary sensor so will wait for that!
Thanks

Valiceemo · January 22, 2018, 10:49am

im still having difficulties getting a DHT sensor to work with the component?

Valiceemo · January 23, 2018, 1:48pm

for anyone that may stumble upon this I found a solution.
your home assistant user must be added to the gpio group, in my case the user is homeassistant

sudo adduser homeassistant gpio

then a reboot of the pi is required sudo reboot

in actual fact it took 2 reboots for this to work for me?

FunkyBoT · June 7, 2018, 8:13pm

Thanks for the tip. I was struggling with this.

alexhoffenreich · April 11, 2019, 1:33pm

Sorry, Im new to this and have the same issue.
Can you explain how you did it?
10x

wtamayom · March 8, 2021, 10:19pm

Hi
How do I putty on Has.io?
Thanks.