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by tpylkko
Thu May 13, 2021 5:58 pm
Forum: General discussion
Topic: fingerprint reader to log in?
Replies: 5
Views: 423

Re: fingerprint reader to log in?

You could add a fingerprint reader to the pi. They can be bought from electronics shops and Alibaba/ebay and so on. But if you really only want to not type in the password, then another option is to use blueproximity (for example) to allow unlocking the screen when a bluetooth device that you carry ...
by tpylkko
Thu May 06, 2021 4:21 am
Forum: General discussion
Topic: recommend scientific graphing program?
Replies: 12
Views: 929

Re: recommend scientific graphing program?

I have to second the notion that plotting in Julia is very convenient and effecient. Because it is just-in-time compiled, the first time you use your routine is many time slower than after that. However, on a pi I have not used it. No idea if it works. There was some optizations to the time-to-first...
by tpylkko
Tue Mar 09, 2021 6:12 am
Forum: General discussion
Topic: Raspberry pi remote access
Replies: 8
Views: 1717

Re: Raspberry pi remote access

Do you really need remote desktop access or would X forwarding the graphicscprograms over ssh suffice?
by tpylkko
Fri Mar 05, 2021 11:48 am
Forum: General discussion
Topic: USB Antenna capable of broadcasting WiFi over long distances?
Replies: 12
Views: 858

Re: USB Antenna capable of broadcasting WiFi over long distances?

But isn't the record for LoRa on directional antennas like several hundred kilometres? And getting something in the range of few km doesn't even require any special antenna at all? (EDIT: no actually the record appears to be to around the globe via satelite https://hackaday.com/2018/02/22/at-71572-k...
by tpylkko
Mon Dec 07, 2020 6:21 pm
Forum: General discussion
Topic: How to convert doc or docx files into PDF Format using Command in Raspberry Pi 4 Buster
Replies: 13
Views: 1815

Re: How to convert doc or docx files into PDF Format using Command in Raspberry Pi 4 Buster

There is an application called pandoc that can convert from many formats to another: from the manual: It can read markdown and (subsets of) Textile, reStructuredText, HTML, LaTeX, MediaWiki markup, TWiki markup, Haddock markup, OPML, Emacs Org-mode, DocBook, txt2tags, EPUB and Word docx; and it can ...
by tpylkko
Wed Dec 02, 2020 3:37 pm
Forum: General discussion
Topic: Sending and receiving bluetooth messages with smartphone using python
Replies: 3
Views: 622

Re: Sending and receiving bluetooth messages with smartphone using python

This sounds like a situation where you would want to use Bluetooth Low Energy, as far as I can see. I mean, you are only interested in sending and receiving short bursts of data and probably want to keep a persistent long term connection (avoid pairing and all that). The bluepy library allows you to...
by tpylkko
Mon Aug 17, 2020 1:34 pm
Forum: General discussion
Topic: anacron not a systemd service/timer
Replies: 8
Views: 813

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: 932

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: 767

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 y...
by tpylkko
Thu May 28, 2020 9:15 am
Forum: General discussion
Topic: do i need SWAP on RPi4 with 4GB?
Replies: 13
Views: 6812

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: 4860

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: 403

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 ...
by tpylkko
Mon May 04, 2020 6:35 pm
Forum: General discussion
Topic: i2c between Arduino and Raspberry Pi issues
Replies: 4
Views: 459

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: 403

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: 9861

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: 3102

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: 3102

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: 1421

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: 9861

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: 44
Views: 15369

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: 44
Views: 15369

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: 95
Views: 117419

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: 87
Views: 7892

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: 2638

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...

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