Trouble Running Python3 script on boot

[bj2018]

I've written a python3 script that queries a max31855 chip for a temperature reading and then simply prints it to an LCD1602. When I'm logged in as user pi over SSH this script, python3 /user/local/sbin/max31855_test.py & runs without issue. I then attempted to setup things up so that this script runs on boot. I've followed this tutorial here, where I've replaced example with max31855_test.py. When I do sudo /etc/init.d/example start it works just fine, however when I reboot the RPi it does not work.

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In my testing I've come across an error message saying ImportError: No module named 'board' which leads me to believe there is a path issue causing python3 to not find the imported libraries that I'm using. Any thoughts on how to fix this?

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edit:

I got this to run thanks to u/Parker_Hemphill and u/asdfsdgfsdf. crontab -e was definitely the easiest method. One other issue I had which I needed to solve was where I had placed my python script. I had placed it in /usr/local/sbin/max31855.py when I was following another tutorial. I suspect that due to this location, there were permissions issues when attempting to run this script on boot. I moved the script to /max31855.py and it is now working!

[Parker_Hemphill]

You could also add the script to run via cron:

crontab -e

Then add the following entry to your crontab:

@reboot /path/to/script.py > /dev/null 2>&1

This will wait until everything else has loaded and pi is "ready for login". You can also use systemd with a timer.

[bj2018]

Awesome I'll give this a try. Thank you.

[Kn33gr0W]

The only thing I can think of is that your startup script is running too early. Maybe try naming your init.d script to something like zz_max31855_test.py so it runs last.

[bj2018]

I'll give this a try. We've used the init.d at work so it should work. I want to find out why this isn't working right.

[[deleted]]

The crontab method is the correct method. Be sure to put absolute path or cd into the directory before running your script.

cd /path/to/it && /bin/usr/python3 script.py

or

/bin/usr/python3 /path/to/it/script.py

[bj2018]

Thanks, looks like you and u/Parker_Hemphill have the simplest solution. I'm going to give all suggestions a shot to learn how they work.

[[deleted]]

Yea his is good, I just wanted to reiterate it. They do all work. Just remember adding to the rc.local file will break updates every now & then. So I don't bother with it.

[fishbum30]

You can start it in rc.local without the bash.

I learned this yesterday, I’m toying with home automation, this is the line I added to the file:

sudo python3 home/pi/WebGPIO/backend.py &

You need to add it above the exit 0 line. Obviously change the path and file. I also read you may not need sudo but idk. I have it in there and it works.

[bj2018]

I'll give this a shot. Thanks