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A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.

MMM-DHT22 Humidity and Temperature Module

Scheduled Pinned Locked Moved Utilities
47 Posts 14 Posters 42.5k Views 14 Watching
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  • D Offline
    DocVooDoo @ryck
    last edited by Feb 14, 2018, 5:07 PM

    @ryck is it possible that the module root rights needs but does not get?

    with another module comes the same error. root privileges are needed there

    R 1 Reply Last reply Feb 14, 2018, 5:30 PM Reply Quote 0
    • R Offline
      ryck Module Developer @DocVooDoo
      last edited by Feb 14, 2018, 5:30 PM

      @DocVooDoo I guess that depends on how you installed magicmirror… did you use sudo?

      D 1 Reply Last reply Feb 14, 2018, 7:53 PM Reply Quote 0
      • D Offline
        DocVooDoo @ryck
        last edited by Feb 14, 2018, 7:53 PM

        @ryck no, without sudo. only with the command
        bash -c “$(curl -sL https://raw.githubusercontent.com/MichMich/MagicMirror/master/installers/raspberry.sh)”

        1 Reply Last reply Reply Quote 0
        • Y Offline
          yawns Moderator
          last edited by Feb 14, 2018, 8:26 PM

          Some modules or dependencies require access to the GPIO
          The DHT sensor module I wrote needs this as well.
          In terminal please try this
          sudo adduser -g $USER gpio

          I can’t remember if you need to reboot afterwards, but it won’t hurt. Then try again accessing the sensor

          D 1 Reply Last reply Feb 14, 2018, 8:31 PM Reply Quote 0
          • D Offline
            DocVooDoo @yawns
            last edited by Feb 14, 2018, 8:31 PM

            @yawns
            Hi. Thanks for your help. The user “pi” is already a member of the group “gpio”.

            With Adafruit works the Sensor. Whether with or without sudo…

            1 Reply Last reply Reply Quote 0
            • P Offline
              pinsdorf Module Developer
              last edited by Mar 5, 2018, 12:52 AM

              Any updates on this? I have the same problems as @DocVooDoo and others, i.e. Adafruit code works like a charm, dht_var not.

              Difference I noticed is that dht_var uses wiringpi library and Adafruit not?! I tried a reinstall of wiringpi package without success.

              Next, I compared the implementations of dht_var and the Adafruit driver for DHT22.

              The essence of the Adafruit code is in file Adafruit_Python_DHT/source/Raspberry_Pi_2/pi_2_dht_read.c. It is meant for Pi2 and Pi3, implemented in C, and defines a function int pi_2_dht_read(int type, int pin, float* humidity, float* temperature). It implements the communication with the sensor using a 1-wire bus. The rest of the Adafruit package is mostly (well-done) sugar-coating for Python usage and selecting the right driver for any given platform.

              We could simply rewrite dht_var by using this driver code. What do you think?

              1 Reply Last reply Reply Quote 0
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