Without root permission won't set

[cypridox]

Thanks for this usefull package and the clear documentation! The installation went well on a RPI 3B and I got sensor readings. I want to use the sensor in Python programs and so I want to get rid of the root permission. Unfortunately this doesn't work for me. I used sudo chmod g+r /dev/ttyAMA0 using ls -la /dev/ttyAMA0 this gave me crw-rw---- 1 root tty 204, 64 Nov 8 20:00 /dev/ttyAMA0 but when I tried python3 -m mh_z19 --serial_console_untouched I got an error:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 265, in open
    self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
PermissionError: [Errno 13] Permission denied: '/dev/serial0'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/mh-z19/mh_z19.py", line 66, in read_concentration
    ser = connect_serial()
  File "/home/pi/mh-z19/mh_z19.py", line 62, in connect_serial
    timeout=1.0)
  File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 240, in __init__
    self.open()
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 268, in open
    raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 13] could not open port /dev/serial0: [Errno 13] Permission denied: '/dev/serial0'
{}

And then the 'r' on the fifth position is gone and I have to use chmod again. How to solve this?

[UedaTakeyuki]

The error message reports no permission to read the serial port /dev/serial0. Could you please check about it?

[cypridox]

Thanks for your reply. The serial port appeared to be there on /dev/ttyS0. I added the read rights. It required a reboot but now it works without sudo. Issue can be closed.

[UedaTakeyuki]

I am glad to hear that it works properly after granting the necessary permissions. Have fun!