Added small LCD Display/screen for information about use space disk

ruffhi · March 28, 2025, 12:56pm

rainmeter is just windows. And I was thinking more of getting the info he wants to display on a desktop rather than a small screen. Ok, so, maybe not an exact match to OPs request … but something that I will be looking at for my setup.

And, ok, maybe a different thread would have been more appropriate.

Bad ruff. Bad ruff

oxyde · March 28, 2025, 2:02pm

Meanwhile i have converted the bash to a python, trying to give it a better and solid structure.
What i really understimated is the fact will be really hard use a so small screen for every usefull info i’m starting improving info from pool (using pool.query), and i don’t know where put data

oxyde · March 30, 2025, 6:27pm

@Imam_Darwis if you still interested, i have pushed on github the result of my work: GitHub - oxyde1989/tn-picopi-lcd: control a pico-pi with an lcd to display truenas system - pool - app info

Also i accept suggestion to the data to show

Now i’m puzzled: at beginning was sure to put it on an unused 5.25" slot… but maybe i can use a long cable and put it under one of the monitor of main pc

Imam_Darwis · March 30, 2025, 9:42pm

hi @oxyde thank you so much, you so kind , i’ll try your tutorial next weekend. wish me luck

warm regards

Imam_Darwis · March 31, 2025, 1:38am

hi @oxyde good day,

i just try your code, and come up the dump question about that code, are i need to install psutil?

oxyde · March 31, 2025, 5:06am

No everything should be available without install anything

Imam_Darwis · March 31, 2025, 12:29pm

hi @oxyde

because i see this error when i try? am i make mistake?
by the way i use 25.04-RC.1 and i see Jira i dont know that jira report is have corelation or not (sorry for my poor english)

regards

oxyde · March 31, 2025, 12:42pm

was just saying that the only thing come into my mind was that they remove psutil from Fangtooth, the ticket you mention not confirm that but i think is.
I will made some test, i have a small VM with Fangtooth, in case is just a matter of find another solution that work nor with EEL and Fangtooth

Finallf · April 1, 2025, 3:23am

I have a water cooler that has a small 2-digit LCD on top of it.

I have already managed to communicate with it, but my problem is how to get the correct temperature that is displayed on the dashboard. I am using lm-sensors, but it clearly shows the CPU temperature is wrong. The sensors show me 37~40º but in reality the CPU is at 78~80º, which is correct, and what is being displayed on the dashboard.

Could someone tell me how I can get the CPU temperature that is being displayed on the dashboard?
It can be done in shell.

Imam_Darwis · April 1, 2025, 5:44am

thanks @oxyde

oxyde · April 1, 2025, 9:56am

there are 2 versions now on github, grab this one instead of the other:

github.com/oxyde1989/tn-picopi-lcd

TN_Pico_LCD_2504.py

main

import time, subprocess, argparse, os, sys, json

def get_midclt_data(method):
    try:
        midclt_output = subprocess.run(
            ["/usr/bin/midclt", "call", method],
            capture_output=True,
            text=True,
            check=True
        )
        try:
            midclt_parsed = json.loads(midclt_output.stdout)
        except json.JSONDecodeError as e:
            print(f"Error: Failed to decode JSON response from midclt: {e}")
            sys.exit(1)     
        return midclt_parsed
        
    except subprocess.CalledProcessError as e:
        print("Error: calling midclt")
        sys.exit(1)

This file has been truncated. show original

I have removed psutil, tried another way to retrieve data but honestly i don’t have a proper test environment to check if is data are realistic or not.
Give it a try and let me know

i used sensor and didn’t have those problem honestly… nor using bash and python.
Wanna share the code, i will check on my system too

joeschmuck · April 1, 2025, 3:00pm

This sounds like an interesting little project. I’d have to 3D print some sort of surface mounted faceplate as I do not have any openings in my case for front mounted anything.

Rotating thru cpu temp, unused RAM, a few other useful data to have at a glance would really round out the setup. And of course I would want to take it to the next level by including a drive serial number if one needs to be replaced. Who needs a console? but seriously, I think I do want to take a stab at this. Time to look up that display to get some dimensions.

@oxyde great work!

oxyde · April 1, 2025, 3:22pm

i’m already considering to buy a 20x4 display because 16x2 is quite small, just 3€ with the l2c on aliexpress and double space available
Scripts will need some adjustement, but i don’t see any problem to manage 2 different versions… so everyone can grab the version optimized for his display.

Despite, ZFS math is hard… the data i display is not 100% correct, but is a good rappresentation of the reality

Gyula_Masa · April 1, 2025, 4:26pm

This one does not use GPIO pins, but USB:
https://forums.raspberrypi.com/viewtopic.php?t=33021

joeschmuck · April 1, 2025, 5:20pm

Yes but don’t do math if you use zpool list. It will list in PiB/TiB/GiB/MiB etc. Pretty easy to list when it states 14.5T and no math. Or you could use the value from pool.query which is also listed in bytes, just divide by 1024 until you have 3 or 4 most significant digits remaining and that scales to PiB/TiB/GiB/MiB, etc… The same value as zpool list returns.

oxyde · April 1, 2025, 5:40pm

I’m probably missing something obvious (glad you are there )
I take as example the command used there for simplicity

midclt call pool.query '[[ "name", "in", ["*"] ]]' | jq -r '.[].size'

This give me the same result as zpool list as you already pointed, but for the stripe and mirrored pool, this seems ok… For the raidz2 pool both are ~6tib and not what I would expect (~4tib)

joeschmuck · April 1, 2025, 8:30pm

Yup, I fell into a trap when I was looking for a match using pool.query.

I do nt know of an API that provides it, if you find one, let me know.

Here is how I did it in Multi-Report…
zfs list -d 0
or
zfs list -d 0 -o name,used,avail and add ‘used’ and ‘avail’ to get capacity.

Yes, zpool list provides the zpool capacity which is not the same as zfs capacity.

Imam_Darwis · April 2, 2025, 9:06am

hi @oxyde @joeschmuck how if we use something like this? its is work?

oxyde · April 2, 2025, 12:51pm

I will test as i can, we should be on the right way now.
Meanwhile did you try the modified version for Fangtooth?

Imam_Darwis · April 2, 2025, 1:23pm

hi @oxyde
glad i hear from you, that we on right way. btw i use original fangtooth version upgrade from 24. version.

regards,