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

Problems with Python3 and RPi.GPIO under root

Scheduled Pinned Locked Moved Unsolved Troubleshooting
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  • M Offline
    MyMirror
    last edited by MyMirror Dec 10, 2023, 9:28 AM Dec 10, 2023, 9:15 AM

    Hi all,

    may i ask for a little help?
    I am really not a Linux specialist and would be glad if you could help me with this problem.

    Environment: Raspi 3b with Bullseye
    uname -a gives the following output: Linux MM3 6.1.21-v7+ #1642 SMP Mon Apr 3 17:20:52 BST 2023 armv7l GNU/Linux

    Version of my MagicMirror: 2.25.0

    If I start Python3 as normal user “pi” and call “import RPi.GPIO as GPIO”, then it works but not as root:

    pi@MM3:~/MagicMirror $ pwd
    /home/pi/MagicMirror
    pi@MM3:~/MagicMirror $ whoami
    pi
    pi@MM3:~/MagicMirror $ python3
    Python 3.9.7 (default, Oct 14 2023, 17:06:45) 
    [GCC 10.2.1 20210110] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import RPi.GPIO as GPIO
    >>> 
    pi@MM3:~/MagicMirror $ su - root
    Passwort: 
    root@MM3:~# pwd
    /root
    root@MM3:~# python3
    Python 3.9.7 (default, Oct 14 2023, 17:06:45) 
    [GCC 10.2.1 20210110] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import RPi.GPIO as GPIO
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ModuleNotFoundError: No module named 'RPi'
    >>> 
    root@MM3:~
    

    Unfortunately, I cannot start such a python script for a PIR as a service. What is the user root missing that the user “pi” has?

    I want the Python script here: /lib/systemd/system to start as a service when starting the raspi: pir_sensor.service This is not done with the user “pi” but as “root” or “system”, right?
    Contents of pir_sensor.service:

    [Unit]
    Description=MagicMirror PIR Service
    After=multi-user.target
    
    [Service]
    Type=idle
    WorkingDirectory=/home/pi/MagicMirror
    Restart=on-failure
    User=root
    ExecStart=/usr/bin/python3.9 /home/pi/MagicMirror/pirx.py
    
    [Install]
    WantedBy=multi-user.target
    

    And the start of my pirx.py looks like this:

    #!/usr/bin/python3
    # coding: utf8 #
    import RPi.GPIO as GPIO
    

    As user pi it works well, but as described above, not as root or “system”.
    Can anyone help me to repair Python to work under root/system as well with RPi.GPIO?

    Thanks
    Jens

    S 1 Reply Last reply Dec 10, 2023, 1:01 PM Reply Quote 0
    • S Offline
      sdetweil @MyMirror
      last edited by sdetweil Dec 10, 2023, 9:48 PM Dec 10, 2023, 1:01 PM

      @MyMirror use pm2 to launch your script. it will launch as the user

      see pm2 --help

      after the appropriate pm2 start
      do pm2 save
      to have that task launched at boot

      Sam

      How to add modules

      learning how to use browser developers window for css changes

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