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by scruss
Sun Oct 06, 2019 3:27 pm
Forum: Off topic discussion
Topic: Best Raspberry Pi Alternatives 2019
Replies: 62
Views: 5592

Re: Best Raspberry Pi Alternatives 2019

Personally I'm very interested in the PineTab … The original PineBook was slightly better than it should have been for the money, but Pine's support for it wasn't great. I don't think that you'll see a new CPU on the PineTab: if it's shipping about now, they'll have locked down hardware. The LPDDR3...
by scruss
Sun Oct 06, 2019 2:49 pm
Forum: General discussion
Topic: How to INSTALL Linux onto a Raspberry 4?
Replies: 30
Views: 1492

Re: How to INSTALL Linux onto a Raspberry 4?

I've moved over the Raspain and it really could do with some tweeks. Ideally I would prefer CentOS as my professional OS is RedHat (Licienced) and CentOS is the nearest to it (unlicienced). There's nothing to stop you running CentOS on Raspberry Pi: CentOS Linux on the Raspberry Pi 3 . One of the v...
by scruss
Sat Oct 05, 2019 9:37 pm
Forum: General discussion
Topic: Anyone used the Official Raspberry Pi keyboard and mouse with a PC? Is is compatable?
Replies: 6
Views: 275

Re: Raspberry Pi 4 Thread - general discussion

With one small exception: the keyboard does not provide the Ins key which is important for some PC applications to change from insert mode to overwrite mode. Examples are Microsoft Word, Microsoft Excel, etc. This is a feature, not a bug. I think it's been 20 years since I last used overwrite mode ...
by scruss
Sat Oct 05, 2019 9:31 pm
Forum: Troubleshooting
Topic: Adding aliases in .bashrc
Replies: 4
Views: 89

Re: Adding aliases in .bashrc

If you use aliases, they should go in the ~/.bash_aliases file. You can create/update them with:

Code: Select all

alias > ~/.bash_aliases
by scruss
Thu Oct 03, 2019 2:56 am
Forum: Troubleshooting
Topic: wi-fi printer not responding
Replies: 8
Views: 162

Re: wi-fi printer not responding

The MFC410 should work. But if they're on different networks, they won't.
by scruss
Thu Oct 03, 2019 12:16 am
Forum: Troubleshooting
Topic: wi-fi printer not responding
Replies: 8
Views: 162

Re: wi-fi printer not responding

what model of Canon? It matters a lot. Is the Raspberry Pi on the same network as the printer? If your Canon supports AirPrint (direct printing from Apple iPads etc) then it should also support IPP. You can try installing these packages: sudo apt install cups cups-ipp-utils system-config-printer and...
by scruss
Wed Oct 02, 2019 2:58 pm
Forum: Troubleshooting
Topic: Unable to write a .service file to systemd for auto-booting python programs
Replies: 6
Views: 153

Re: Unable to write a .service file to systemd for auto-booting python programs

You can run services as a regular user too. They run from the ~/.config/systemd/user folder. Here's one way of doing it (self link): Creating a systemd user service on your Raspberry Pi I'm not sure how well sudo plays with systemd. Do you need it for your script? If you're running a system (root) s...
by scruss
Wed Oct 02, 2019 2:52 pm
Forum: Scratch
Topic: Scratch3: translate the new extension
Replies: 2
Views: 165

Re: Scratch3: translate the new extension

Contacting the Raspberry Pi translation community might be a good first step.

(as mentioned in the blog post: Pulling Raspberry Pi translation data from GitHub)
by scruss
Wed Oct 02, 2019 4:01 am
Forum: General discussion
Topic: ZX Spectrum emulation on Raspberry
Replies: 6
Views: 2813

Re: ZX Spectrum emulation on Raspberry

I'm perfectly happy with Fuse for all my Deathchase needs.
by scruss
Wed Oct 02, 2019 12:03 am
Forum: Networking and servers
Topic: Automating accessing FTP server to print document
Replies: 17
Views: 460

Re: Automating accessing FTP server to print document

Okay, this'll need a bit of work, but it's what I remember using as a periodic ftp sync tool. → Install lftp: sudo apt install lftp . I wouldn't have suggested kermit for this, but it's perfectly good for other things. lftp has a mirror mode that copies a whole remote site or remote folder to wherev...
by scruss
Mon Sep 30, 2019 9:56 pm
Forum: General discussion
Topic: Official Rpi4 case needs a fan
Replies: 10
Views: 320

Re: Official Rpi4 case needs a fan

There's room for a fan in there: I have a fan shim working away quite happily in mine.
by scruss
Mon Sep 30, 2019 5:29 pm
Forum: Troubleshooting
Topic: py_pol perplexing problems persist (SOLVED)
Replies: 11
Views: 216

Re: py_pol perplexing problems persist

sonettguy wrote:
Mon Sep 30, 2019 4:55 pm
Still seeking a solution.
Please define clearly what you want to do. It's not just to help us, but it'll help you define when your project works or not. So far, all you've said is that it doesn't work, but none of us know what you mean by “work”.
by scruss
Mon Sep 30, 2019 4:35 pm
Forum: Troubleshooting
Topic: py_pol perplexing problems persist (SOLVED)
Replies: 11
Views: 216

Re: py_pol perplexing problems persist

If I follow the instructions for implementing a non-interactive mode drawing, which is supposed to show 3 consecutive plots, with a file as follows, import numpy as np import matplotlib.pyplot as plt plt.ioff() for i in range(3): plt.plot(np.random.rand(10)) plt.show() Then, I get the first drawing...
by scruss
Mon Sep 30, 2019 4:27 pm
Forum: Troubleshooting
Topic: py_pol perplexing problems persist (SOLVED)
Replies: 11
Views: 216

Re: py_pol perplexing problems persist

…In that case, it just goes back to the prompt without a plot window opening and without an error or warning. I don't know what those represent. Are there different ones for different types of plots? Your code is set to write a png image, which it does. You get poincare1.png in the current folder? ...
by scruss
Mon Sep 30, 2019 4:18 pm
Forum: Advanced users
Topic: Error when compiling Brother SC
Replies: 11
Views: 306

Re: Error when compiling Brother SC

… one of my colleagues who use the pi's a lot said if i can get the SC and compile it it should work Sounds like they might be passing the buck. … but i saw that its only for x86 arch, he then said if we compile it using gcc it should be compiled in arm. Is he correct when he said that? Brother onl...
by scruss
Mon Sep 30, 2019 1:11 pm
Forum: Advanced users
Topic: Error when compiling Brother SC
Replies: 11
Views: 306

Re: Error when compiling Brother SC

That's an old, old printer: it still has a parallel port! My advice about using IPP only applies to certain recent (≤ 5 years or so) network printers that use IPP. It also only covers the printing side, as you noted. It looks like you may be missing a bunch of *-dev packages needed to build the sour...
by scruss
Sun Sep 29, 2019 1:29 pm
Forum: General discussion
Topic: Chromium browser filenames with spaces
Replies: 11
Views: 286

Re: Chromium browser filenames with spaces

No standard, but you can use find's -print0 along with xargs' -0 option to process those files. Also, careful quoting in shell scripts: a variable should never be bare but always quoted (so "$f" , not $f ). While you can't rename files that other programs use, the rename program (which might be inst...
by scruss
Sat Sep 28, 2019 9:16 pm
Forum: Networking and servers
Topic: Automating accessing FTP server to print document
Replies: 17
Views: 460

Re: Automating accessing FTP server to print document

If files are small, you likely won't be bitten by this problem.
Use the simplest solution that works. If you implement something that works but you don't understand, it'll be impossible to fix.
by scruss
Sat Sep 28, 2019 5:20 pm
Forum: Networking and servers
Topic: Automating accessing FTP server to print document
Replies: 17
Views: 460

Re: Automating accessing FTP server to print document

Are the files created instantaneously on the ftp server? You might poll the FTP folder and start downloading a file that was only part-way uploaded. (used to work on a prepress server that had a client whose emergency jobs were literally Stop Press : when files appeared on their server, we had to do...
by scruss
Fri Sep 27, 2019 6:17 pm
Forum: Troubleshooting
Topic: py_pol perplexing problems persist (SOLVED)
Replies: 11
Views: 216

Re: py_pol perplexing problems persist

Are you running another Python installation, or the stock one? Sometimes large packages (I've seen Jupyter do this) want their own whole installation, and they modify your PATH variable to point to their own python3 executable. If the command which python3 doesn't return /usr/bin/python3 , then some...
by scruss
Thu Sep 26, 2019 12:39 pm
Forum: Troubleshooting
Topic: RPI4 4GB cannot handle full-featured charts on tradingview.com
Replies: 28
Views: 804

Re: RPI4 4GB cannot handle full-featured charts on tradingview.com

Hmm, that's a few indicators, but nothing like the angry fruit salad/clown barf I used to see (with candlesticks over everything , and all on 1024x768 screens 'cos that's what people used back then). It might be that the site just doesn't like Chromium. Maybe it's looking for fonts you don't have. I...
by scruss
Thu Sep 26, 2019 12:32 pm
Forum: General discussion
Topic: What is a good replacement for Etcher (ads and ignores privacy)
Replies: 84
Views: 3705

Re: What is a good replacement for Etcher (ads and ignores privacy)

I do take issue with "hundreds of thousands of dollars a year on development of etcher". I cannot see how they can be spending that much money on it They've got a couple of devs, and a team of undetermined size developing the Etcher Pro hardware duplicator. So even if they've got four people at min...
by scruss
Thu Sep 26, 2019 1:31 am
Forum: General programming discussion
Topic: how to create backup of an SDB (sqlite3 database) file?
Replies: 4
Views: 252

Re: how to create backup of an SDB (sqlite3 database) file?

You do need to ensure there's no SQLite3 process running that has your database open. True enough. So a better way would be: sqlite3 source.sdb ".backup 'destination.sdb'" This has the same effect as copying the file, but ensures that the database is locked while copying so other processes can't co...
by scruss
Wed Sep 25, 2019 8:48 pm
Forum: General discussion
Topic: trying to compile UNetbootin
Replies: 8
Views: 262

Re: trying to compile UNetbootin

Just because the Pi does not use UEFI doesn't mean anything. You said you wanted to "use" it on Raspberry Pi, and to me, that means make bootable stuff for Raspberry Pi. the next person that blurts out use DD gets 1000 lashings with a wet noodle. Meant in jest, I know, but please do not threaten vi...
by scruss
Wed Sep 25, 2019 8:43 pm
Forum: Troubleshooting
Topic: RPI4 4GB cannot handle full-featured charts on tradingview.com
Replies: 28
Views: 804

Re: RPI4 4GB cannot handle full-featured charts on tradingview.com

former forex backend dev and tech support guy here¹: have you any particular options enabled in the chart, like faster refreshing, or lots of trend lines, or …? It always amazed me how much stuff some traders had on their display, and sometimes it could bring a browser to its knees. If you can turn ...

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