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by tpylkko
Mon Aug 17, 2020 1:34 pm
Forum: General discussion
Topic: anacron not a systemd service/timer
Replies: 8
Views: 326

Re: anacron not a systemd service/timer

One of the nice things about systemd unit files is that you do not need to be any kind of shell scripting specialist to create very complex setups. For example, if you are worried that many things will run at the same time, you can use RandomizedDelaySec to set a random delay to services so that the...
by tpylkko
Wed Jul 15, 2020 12:23 pm
Forum: General discussion
Topic: Performing an action after a file is written to a directory on RPi4?
Replies: 6
Views: 234

Re: Performing an action after a file is written to a directory on RPi4?

You can do this directly with systemd. You create a .path file

Just Google "monitor directory systemd path unit"
by tpylkko
Tue Jun 09, 2020 7:31 am
Forum: General discussion
Topic: SD Card Copier overwriting the wrong drive! What a destructive glitch.
Replies: 5
Views: 521

Re: SD Card Copier overwriting the wrong drive! What a destructive glitch.

I am careful enough that I have never accidentally destroyed a disk (yet) even though I have been using dd for a decade now for everything. I was warned that it is called "destroyer of disks". However, as far as I know, there are free disk recovery tools like testdisk. This might help if you destroy...
by tpylkko
Thu May 28, 2020 9:15 am
Forum: General discussion
Topic: do i need SWAP on RPi4 with 4GB?
Replies: 13
Views: 2622

Re: do i need SWAP on RPi4 with 4GB?

One alternative solution is to use zram or zswap , which will compress the swap to RAM. In case you want to avoid ware to memory card, or the card is slow. OF course, the compression is going utilize cpu time, but this might be a good trade-off for some use cases. But back to topic: There is definit...
by tpylkko
Wed May 06, 2020 5:30 am
Forum: General discussion
Topic: Slow transfer speed with Raspberry Pi? Router issue (Solved)
Replies: 19
Views: 1118

Re: Slow transfer speed with Raspberry Pi? Router issue (Solved)

Hi guys, finally I discovered were the problem was. My router is doing bottleneck. It has 100mb/s transfer so having transfers speeds of 12Mb/s is actually good. I need to buy a router that provides 1 gigabit. The ironic thing is that fist answer to you in this thread, suggested exactly that proble...
by tpylkko
Mon May 04, 2020 6:44 pm
Forum: General discussion
Topic: Raspbian on 1.3 spi serial oled display
Replies: 3
Views: 186

Re: Raspbian on 1.3 spi serial oled display

I know that Adafruit makes a 1.8" 18-bit Color TFT screen... it has 128x160 pixels.... which is more than 1.3" oleds... but I wonder what a desktop would look like on those... https://www.adafruit.com/product/358 I think your main issue is that you want to show a standard desktop computer interface....
by tpylkko
Mon May 04, 2020 6:35 pm
Forum: General discussion
Topic: i2c between Arduino and Raspberry Pi issues
Replies: 4
Views: 219

Re: i2c between Arduino and Raspberry Pi issues

How are they connected to each other? Or do you mean you are trying to have them communicate with each other with connections wired as in the diagram in your post, and not from one to another device directly? Are the onboard resistors activated? Which one is master and which slave?
by tpylkko
Mon May 04, 2020 9:58 am
Forum: General discussion
Topic: Raspbian on 1.3 spi serial oled display
Replies: 3
Views: 186

Re: Raspbian on 1.3 spi serial oled display

A 1.3 inch oled display will not have enough resolution (and probably is monochromatic) to make running a desktop on it sensible in any kind of way like you can on a TFT or do you mean to run a serial console?
by tpylkko
Mon Apr 27, 2020 6:31 am
Forum: General discussion
Topic: Tiny Low Power Speaker For Raspberry Pi?
Replies: 18
Views: 1417

Re: Tiny Low Power Speaker For Raspberry Pi?

But it probably will not be consuming the absolute theoretical max at all times (because presumably you are playing music or sounds which are intermittently moving the speaker). Also you can do a lot lower the power consumption of the pi depending on what you need. For example you can turn off the h...
by tpylkko
Mon Apr 27, 2020 6:23 am
Forum: General discussion
Topic: Upgraded from jessie to stretch, can I now upgrade to Buster ?
Replies: 13
Views: 686

Re: Buster ?

Right, ok.
by tpylkko
Mon Apr 27, 2020 6:19 am
Forum: General discussion
Topic: Upgraded from jessie to stretch, can I now upgrade to Buster ?
Replies: 13
Views: 686

Re: Buster ?

Are you sure? Where exactly has it not been recommended? I have always upgraded from one release to the next That said, I recall that there was enough patches on to the base Debian from RPF in Rasbian that going from strtetch to buster was not just a matter of apt full-upgrade, there were instructio...
by tpylkko
Wed Apr 22, 2020 7:26 am
Forum: General discussion
Topic: What are the best micro sd card models for raspberry pi 4b?
Replies: 5
Views: 524

Re: What are the best micro sd card models for raspberry pi 4b?

You need to look at some of the benchmarks that other people have already done and posted numerous times. As far as I recall, Samsung and Sandisk cards have mostly take then top spot. Also there are many posts in the forum about A2 and all that. I think a general rule of thumb is that the markings o...
by tpylkko
Wed Apr 22, 2020 7:20 am
Forum: General discussion
Topic: Tiny Low Power Speaker For Raspberry Pi?
Replies: 18
Views: 1417

Re: Tiny Low Power Speaker For Raspberry Pi?

the pimoroni speaker pHAT is almost the same price as that speaker, and it has a DAC,, an amplifier and a 2W speaker in RPi zero form factor. however, I am not sure about the power consumption of it (for batteries)
by tpylkko
Wed Apr 08, 2020 5:24 am
Forum: General discussion
Topic: Video Chat on the Raspberry 4
Replies: 37
Views: 9053

Re: Video Chat on the Raspberry 4

google also has a zoom clone called "meets". so it has a client (and probably a chromium addon) and a webpage for conferencing. I wonder if it would run any better than Duo?
by tpylkko
Mon Apr 06, 2020 7:20 am
Forum: General discussion
Topic: Video Chat on the Raspberry 4
Replies: 37
Views: 9053

Re: Video Chat on the Raspberry 4

zoom also has a chromium plugin, that has been used on rpi, see:
https://www.raspberrypi.org/forums/view ... 0#p1637107
by tpylkko
Fri Apr 03, 2020 5:15 pm
Forum: General discussion
Topic: Running Zoom video conferencing client on the Pi
Replies: 84
Views: 67718

Re: Running Zoom video conferencing client on the Pi

Zoom has a linux client. But I have no idea if there is a ARM version

https://support.zoom.us/hc/en-us/articl ... m-on-Linux

EDIT: quick glance appears to only 32-bit and 64-bit x86
by tpylkko
Fri Mar 20, 2020 10:33 pm
Forum: General discussion
Topic: How many would be interested in a "real" App Store?
Replies: 36
Views: 2103

Re: How many would be interested in a "real" App Store?

I believe that there are software out there that does something almost like this already. For example, GNOME software has software classified on use basis and ratings by users, I believe Ubuntu has something similar. I realize that these don't include rpi specific software, but I am not mentioning t...
by tpylkko
Sun Mar 15, 2020 8:47 pm
Forum: General discussion
Topic: Viruses on Linux
Replies: 22
Views: 1802

Re: Viruses on Linux

This document is a bit old but it tries to list and discuss some of the viruses that have been discovered targeting linux systems: https://help.ubuntu.com/community/Linuxvirus If you browse that stats on pages like https://statistics.securelist.com/en/on-access-scan/day you will notice that most mal...
by tpylkko
Fri Mar 13, 2020 7:57 pm
Forum: General discussion
Topic: Google Drive Filestream on Pi
Replies: 8
Views: 960

Re: Google Drive Filestream on Pi

I don't know what Filestream is or what it does, but when I access google drive through nautilus (the file manager) it works as described in this page:

https://support.google.com/a/answer/7491144?hl=en

So how is it different? What am I missing?
by tpylkko
Sun Mar 01, 2020 7:15 pm
Forum: General discussion
Topic: Raspberry Pi 3 Model A+ based Tablet projects?
Replies: 12
Views: 2285

Re: Raspberry Pi 3 Model A+ based Tablet projects?

then there is also the pinebook (there is also a tablet and a phone there if you look). In their promotional paragraph in this page, they claim it is like "chromebooks people convert to linux but better".

https://www.pine64.org/pinebook-pro/
by tpylkko
Wed Feb 26, 2020 12:13 pm
Forum: General discussion
Topic: Shut down rpi with a keyboard key combo
Replies: 21
Views: 6232

Re: Shut down rpi with a keyboard key combo

doesn't raspbian/rpi have the magic sysrq? I have never tried, but this is what corresponds to "alt+ctrl+del" to reboot in case of a lock down on linux computers. Never tried it on rpi...

edit: in case some one does not know what this is about:
https://en.wikipedia.org/wiki/Magic_SysRq_key
by tpylkko
Wed Feb 26, 2020 12:06 pm
Forum: General discussion
Topic: Image Processing
Replies: 2
Views: 176

Re: Image Processing

it might be expecting another version of the pandas library
by tpylkko
Wed Feb 26, 2020 12:00 pm
Forum: General discussion
Topic: Q on gpiozero (SOLVED)
Replies: 11
Views: 401

Re: Q on gpiozero

This does not answer your question directly, but I wonder if you are aware that you don't need to write a service to monitor the button and issue a shutdown command, because you can do this just by changing the config files for the kernel? You can eve use the same button to wake up the pi (not sure ...
by tpylkko
Mon Dec 16, 2019 3:45 pm
Forum: General discussion
Topic: Raspberry Pi Tablet OS
Replies: 33
Views: 5262

Re: Raspberry Pi Tablet OS

If my memory serves me, ABS allows for many more ways to polish the surface after the print, however. But PLA is more environment friendly. It is true that when you take the part of the printer, it often looks rough, but it is possible to use many post-processing methods with solvents, sanding, heat...

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