Error about LCD sub project

[Nebulosa-Cat]

I get something wrong like permission denied 、ModuleNotFoundError: No module named 'gpsd'、ModuleNotFoundError: No module named 'smbus'...

looks like somethin wrong between pip and pip3 ?

system: Pi OS 64 Lite

[domschl]

You need two python packages, smbus and gpsd-py3.
I don't know Pi OS 64 Lite, but it might be good to first check if your package manager has packages with names python3-smbus, python-gpsd-py3 or python-smbus, python-gpsd-py3.

If not, you can always use pip (pip and pip3 seem to point to the same pip on your machine):

pip install smbus gpsd-py3

Then, before restarting the service, you could manually start the program for test:

python chronotron.py

You might need to use sudo by typing: sudo python chronotron.py depending on the access rights for smbus.

If you still get module not found errors, while having installed them with pip, you might need to repeat the installation of both modules with sudo pip install smbus gpsd-py3. Note that installing pip modules with sudo should only be done, if the modules are not available via your package manager, so check that first.

Also make sure that you are using python3. Simply start python and check the version number, it should start with 3.....

Once you get it running, I will update the documentation, so please let me know how it goes.

[Nebulosa-Cat]

I first check my python version ( python -V is 2.x.x and python3 -V is 3.9.2
so I do nano ~/.bashrc and alias python=/usr/bin/python3.9
now python -V is 3.9.2 now

and install smbus and gpsd-py3

but still get some wrong like this

(by the way, if use windows copy python file raw content on github and save as .py file, it will show error as "^M" at the end, looks a interpreter error, maybe need to mention just download all github file zip and use sftp upload file to Pi or use git command direct to Pi)

[domschl]

That's progress: the software is now installed, but smbus fails to open.

Possible causes:

• Which raspberry hardware are you using (old raspis need different bus number)?
• Did you enable SMBUS and I2C using raspi-config?
• Did you try to run sudo python chronotron.py?

[Nebulosa-Cat]

That's progress: the software is now installed, but smbus fails to open.

Possible causes:

• Which raspberry hardware are you using (old raspis need different bus number)?
• Did you enable SMBUS and I2C using raspi-config?
• Did you try to run sudo python chronotron.py?

(before and after I open i2c in setting are same) sudo python chronotron.py :

Yes I'm not open i2c setting ( i'm only changed serieal port before), now it work and function normaly when manually use python chronotron.py

but if I use sudo systemctl enable chronotron and sudo systemctl start chronotron it will got Permission denied

if use sudo chmod +x chronotron.py

it will return fail same as use sudo python chronotron.py

[domschl]

I've updated chronotron.py in the repository: That line that causes an error (def exec(cmd):) may have happened because of a name-clash with python's standard libs. Strangely, I never encounter this.

I've renamed the function to (hopefully!) prevent the error.

Please try again with that updated version.

[Nebulosa-Cat]

I've updated chronotron.py in the repository: That line that causes an error (def exec(cmd):) may have happened because of a name-clash with python's standard libs. Strangely, I never encounter this.

I've renamed the function to (hopefully!) prevent the error.

Please try again with that updated version.

looks still bugged, but if simply run python chronotron.py it work.

[domschl]

please verify, if root uses the same python version than use regular user:

try: sudo python and check the version.
Is sudo which python and which python pointing to the same path?

[Nebulosa-Cat]

please verify, if root uses the same python version than use regular user:

try: sudo python and check the version. Is sudo which python and which python pointing to the same path?

weird, maybe the way i'm change python version is wrong ?

[domschl]

So that's a good hint: the default python version for root is the old python2, which won't work!

Try an explicit path for python to start:

# verify version:
sudo /usr/bin/python
# Is there an explicit python3?
sudo /usr/bin/python3
# (results of both should be python 3.9)
# Then try again (if it exists, use `/usr/bin/python3` instead of `/usr/bin/python` 
sudo /usr/bin/python chronotron.py

Then, if that works, we can change the chronotron.service file to use an explicit path.

If that works, edit the service file, and change:

ExecStart=/opt/chronotron/chronotron.py

to:

ExecStart=/usr/bin/python /opt/chronotron/chronotron.py

(Use python3 if that worked better).

Do a sudo systemctl daemon-reload after editing the service file to announce the update.

[Nebulosa-Cat]

So that's a good hint: the default python version for root is the old python2, which won't work!

Try an explicit path for python to start:

# verify version:
sudo /usr/bin/python
# Is there an explicit python3?
sudo /usr/bin/python3
# (results of both should be python 3.9)
# Then try again (if it exists, use `/usr/bin/python3` instead of `/usr/bin/python` 
sudo /usr/bin/python chronotron.py

Then, if that works, we can change the chronotron.service file to use an explicit path.

If that works, edit the service file, and change:

ExecStart=/opt/chronotron/chronotron.py

to:

ExecStart=/usr/bin/python /opt/chronotron/chronotron.py

(Use python3 if that worked better).

Do a sudo systemctl daemon-reload after editing the service file to announce the update.

all fix, thank you very much, look nothing wrong now !

[domschl]

Excellent!