dht-sensors doesn't work anymore

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Hello community,

after a complete new installation of my RaspberryPi 3 (Raspian release from 2016\11\25 and pimatic 0.9.37) the dht-sensors plugin doesn’t show the values of my DHT22 sensor any longer.

I already deleted the plugin and reinstalled it. No success. No errors during installation.

11:48:17.321 [pimatic] Installing: "pimatic-dht-sensors@0.9.2" from npm-registry.
11:48:24.380 [pimatic, ppm] > node-dht-sensor@0.0.31 preinstall /home/pi/pimatic-app/node_modules/pimatic-dht-sensors/node_modules/node-dht-sensor
11:48:24.383 [pimatic, ppm] > ./check-lib.sh
11:48:24.549 [pimatic, ppm] Library bcm2835 found.
11:48:25.180 [pimatic, ppm] > node-dht-sensor@0.0.31 install /home/pi/pimatic-app/node_modules/pimatic-dht-sensors/node_modules/node-dht-sensor
11:48:25.185 [pimatic, ppm] > node-gyp configure
11:48:27.722 [pimatic, ppm] > node-dht-sensor@0.0.31 postinstall /home/pi/pimatic-app/node_modules/pimatic-dht-sensors/node_modules/node-dht-sensor
11:48:27.727 [pimatic, ppm] > node-gyp build
11:48:28.430 [pimatic, ppm] make: Entering directory '/home/pi/pimatic-app/node_modules/pimatic-dht-sensors/node_modules/node-dht-sensor/build'
11:48:28.440 [pimatic, ppm]   CXX(target) Release/obj.target/node_dht_sensor/node-dht-sensor.o
11:48:33.397 [pimatic, ppm]   CXX(target) Release/obj.target/node_dht_sensor/dht-sensor.o
11:48:33.820 [pimatic, ppm]   SOLINK_MODULE(target) Release/obj.target/node_dht_sensor.node
11:48:34.100 [pimatic, ppm]   COPY Release/node_dht_sensor.node
11:48:34.131 [pimatic, ppm] make: Leaving directory '/home/pi/pimatic-app/node_modules/pimatic-dht-sensors/node_modules/node-dht-sensor/build'
11:49:08.839 [pimatic, ppm] pimatic-dht-sensors@0.9.2 node_modules/pimatic-dht-sensors
11:49:08.843 [pimatic, ppm] └── node-dht-sensor@0.0.31 (nan@2.4.0)
11:49:08.884 [pimatic] Loading plugin: "pimatic-dht-sensors" (0.9.2)

The sensor itself works fine and the lol_dht22 script gives me values.

pi@Pi3:~/lol_dht22 $ sudo ./loldht 7
Raspberry Pi wiringPi DHT22 reader
www.lolware.net
Data not good, skip
Humidity = 67.70 % Temperature = 20.80 *C

My device config:

    {
      "id": "dht22-sensor",
      "name": "Raumklima",
      "class": "DHTSensor",
      "type": 22,
      "pin": 7,
      "interval": 5000
    }

Any suggestions?

@SaxnPaule said in dht-sensors doesn't work anymore:

Any suggestions?

Perhaps, it is the wrong PIN number?!
Which version of pimatic-dht-sensors did you use before?
pimatic-dht-sensors use wiringPI pin numbering by default, you can switch it to BCM numbering through

https://www.npmjs.com/package/pimatic-dht-sensors
http://wiringpi.com/pins/

It’s the same version like before. Before I used 0.9.1. I use pin 7 as you could see at the loldht22 command.

@SaxnPaule Did you activate the plugin?

Since when does a plugin need to become activated? Where do I find this option?

Since pimatic 0.9. You can activate the plugin as follows:

• Open the Web Frontend
• Choose “Plugins” from the menu
• For “dht-sensors 0.9.2” press the “Activate” button and restart pimatic thereafter. If the “Deactivate” button is displayed instead of the “Activate” button the plugin has already been activated.

It was already activated.

Rolling back to 0.9.1 solved the problem.

Maybe there is something wrong with the newest version.

@SaxnPaule Note version 0.9.2 is a rewrite using the bcm2835 library instead of wiringPi which we had before, see also https://forum.pimatic.org/topic/2404/important-note-for-pimatic-dht-sensors

I have this stuff up-and-running on Raspi3/Jessie for weeks now. I really would like to understand what the problem is in your case.

I could do some tests. Ask what you want, I’ll try to answer.

The BCM library is installed on my Pi.

Should I test another device config?

@SaxnPaule Can you please give it a try with just installing the base library? https://github.com/momenso/node-dht-sensor

var sensor = require('node-dht-sensor');

sensor.read(22, 4, function(err, temperature, humidity) {
//             ^^^BCM numbering!!! equiv to wiringPi 7
    if (!err) {
        console.log('temp: ' + temperature.toFixed(1) + '°C, ' +
            'humidity: ' + humidity.toFixed(1) + '%'
        );
    }
});

I already did
The script runs and displays… nothing

If I log the error:

pi@Pi3:~/test $ sudo node test.js
[Error: failed to read sensor]

Is this related topic https://forum.pimatic.org/topic/2590/dht22-senor-no-longer-working-on-pin-5-since-last-update-of-pimatic-and-plugins/5 the same issue like mine?

What is the benefit of the new version that doesn’t use wiringPi? Less CPU consumption or what else?

@SaxnPaule said in dht-sensors doesn't work anymore:

What is the benefit of the new version that doesn’t use wiringPi

The old version was hard to maintain as the base library code had been forked from an early version of node-dht-sensor and then ported to wiringPi. The code had several issues amongst these, users complained about the poor error handling (erroneous samples reported). Thus, I decided to use the current version of node-dht-sensors and to provide a PIN mapping function to support wiringPI pin numbering.

I installed the 0.9.3 today. It seems to work. Thanks for the fix!

Not! The frontend shows only the last received values but doesn’t get any updates.