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by topguy
Mon Dec 09, 2019 6:23 pm
Forum: Beginners
Topic: Curious question on machine learning or object detection
Replies: 3
Views: 76

Re: Curious question on machine learning or object detection

If you are able to do pattern recognition in one orientation, you can do it in any other orientation too. ( You just rotate the sample picture 90 degrees 3 times and do a new recognition pass each time ) Even better when the Scrabble tile has "number" in one corner that can tell you what the correct...
by topguy
Mon Dec 09, 2019 6:12 pm
Forum: Graphics programming
Topic: 3,5" LCD Display NOT used as a desktop...
Replies: 5
Views: 107

Re: 3,5" LCD Display NOT used as a desktop...

Which installs as a breeze with LCD show.
And what is "LCD show" ?
by topguy
Mon Dec 09, 2019 11:33 am
Forum: Graphics programming
Topic: 3,5" LCD Display NOT used as a desktop...
Replies: 5
Views: 107

Re: 3,5" LCD Display NOT used as a desktop...

You should tell us which LCD display you are talking about and preferably point us to the installation instructions. And probably mention which Pi model you have and which version of Raspbian you are runnning. but generally.... Usually these displays get their own framebuffer "/dev/fb1" and part of ...
by topguy
Mon Dec 09, 2019 11:25 am
Forum: Troubleshooting
Topic: 3b+ raspbian buster lite with changing working mode
Replies: 1
Views: 49

Re: 3b+ raspbian buster lite with changing working mode

What is the oscilloscope measuring ?
by topguy
Mon Dec 09, 2019 2:20 am
Forum: Troubleshooting
Topic: Raspberry pi and wvdial and usb_power
Replies: 1
Views: 39

Re: Raspberry pi and wvdial and usb_power

I would like to have possibility to change Modem band in wvdial to only at 1800MHz, 2100Mhz and 2600MHz - can someone can help mi with that ? I dont know why you think you need to do such a thing, the modem is probably very good at choosing the correct band by itself. But you have to read the comma...
by topguy
Sun Dec 08, 2019 4:27 pm
Forum: Beginners
Topic: building libudev for the Pi
Replies: 4
Views: 81

Re: building libudev for the Pi

Code: Select all

/usr/lib/gcc-cross/arm-linux-gnueabihf/5/../../../../arm-linux-gnueabihf/bin/ld: cannot find -llibudevlib
libudevlib is not the correct name its either "libudev" or just "udev"

You didnt mention that you were doing cross compiling, do you use a sysroot made from a raspbian image ?
by topguy
Sun Dec 08, 2019 3:00 pm
Forum: Troubleshooting
Topic: access root user without root?
Replies: 3
Views: 79

Re: access root user without root?

You have probably broken the security of you whole system so I would suggest to find a new SD card and install the software again there and then see if you can extract the necessary files from the old card. You could access the SD card from another linux system with an SD-card reader. And while you ...
by topguy
Sun Dec 08, 2019 2:47 pm
Forum: Beginners
Topic: How to put drivers for Windows to Samba printer?
Replies: 2
Views: 118

Re: How to put drivers for Windows to Samba printer?

Not a very Raspberry Pi specific problem so the answers are probably out there if you search.
https://www.oreilly.com/library/view/li ... 04s04.html
by topguy
Sun Dec 08, 2019 12:46 am
Forum: Beginners
Topic: building libudev for the Pi
Replies: 4
Views: 81

Re: building libudev for the Pi

I believe that this is due to it not being linked with libudev -- correct? Did you tell the compiler to link with libudev then or where you just building someone elses code ? Can you give me us a link to this "Yost API" ? Udev is such a cetral part of the Linux device handling so I would be very su...
by topguy
Fri Dec 06, 2019 2:36 pm
Forum: General discussion
Topic: QR code scanning
Replies: 2
Views: 84

Re: QR code scanning

You need some more hardware. - Either you get a barcode-scanner and there is a lot to choose from : https://www.aliexpress.com/popular/qr-code-scanner-usb.html - Or you get a camera, pi-camera or web-camera. The scanners are usually faster and will present you with the decoded content of a QR core. ...
by topguy
Thu Dec 05, 2019 11:40 pm
Forum: Troubleshooting
Topic: Cant see display in 5 inch touch screen
Replies: 1
Views: 52

Re: Cant see display in 5 inch touch screen

First its very helpful if you tell us which guide you were following in the first place, which display you bought, and which Raspberry pi model you have.
by topguy
Thu Dec 05, 2019 4:24 pm
Forum: Media centres
Topic: [Pi 4] Send image through serial
Replies: 3
Views: 132

Re: [Pi 4] Send image through serial

Explain to us how you want the line to look.

The integer 123 is not converted to the string "123" by the s.write() you have to do that first.
by topguy
Wed Dec 04, 2019 3:44 pm
Forum: Automation, sensing and robotics
Topic: What Linux to mount?
Replies: 7
Views: 221

Re: What Linux to mount?

The differences between different Linux distributuions for this use should be minimal, if you can not do it with the standard Raspbian there is probably no other Linux that can succeed either.
by topguy
Wed Dec 04, 2019 3:09 pm
Forum: Raspbian
Topic: How to install efficient VNC on Raspbian
Replies: 14
Views: 388

Re: How to install efficient VNC on Raspbian


I've just noticed that the VNC is not seeing the 'real' desktop so no fit for my purpose.
So what is wrong with the official guide in that case: https://www.raspberrypi.org/documentati ... /README.md ?
by topguy
Wed Dec 04, 2019 2:44 pm
Forum: Automation, sensing and robotics
Topic: What Linux to mount?
Replies: 7
Views: 221

Re: What Linux to mount?

- What is your definition of an "embedded application" ?
- What exactly need to be "fast" ?
- Why is this posted under C++ ?
by topguy
Wed Dec 04, 2019 10:50 am
Forum: Networking and servers
Topic: Email server Rpi4 - tutorial needed
Replies: 4
Views: 205

Re: Email server Rpi4 - tutorial needed

- What is the purpose of the mail-server ? Do you have a internet domain you want to receive mail to ? - Where/When do the guides you have tested fail ? Installation / configuration / execution ? - Its best to choose guides for Debian if you cant find directly Raspbian guides: https://wiki.debian.or...
by topguy
Tue Dec 03, 2019 8:23 pm
Forum: Media centres
Topic: [Pi 4] Send image through serial
Replies: 3
Views: 132

Re: [Pi 4] Send image through serial

What are the stats for your radiolink ? - Is it two-way communication ? ( if not this is going to be rather difficult ) - What is the bandwidth/speed ? ( bits per second ) Back in the days when BBS was a thing we use special filetransfer protocols called Xmodem/Ymodem and Zmodem. On the linux end yo...
by topguy
Tue Dec 03, 2019 7:09 pm
Forum: Beginners
Topic: Remote emulation with a Pi
Replies: 1
Views: 63

Re: Remote emulation with a Pi

If you can add your N64 emulator to your Steam library on the PC,you might be able to use SteamLink.

https://support.steampowered.com/kb_art ... -IFGH-6589
https://uk.pcmag.com/gallery/123035/how ... to-your-tv
by topguy
Mon Dec 02, 2019 7:05 pm
Forum: Camera board
Topic: FPS influence possible by writing to sd-card?
Replies: 4
Views: 138

Re: FPS influence possible by writing to sd-card?

I think the ext4 file system flush its cached data about every 5 seconds and writing to sd-flash is a bit slow, so while this is happening creating/writing new files might be blocking. In a RAM disk write time is not an issue.
by topguy
Mon Dec 02, 2019 6:37 pm
Forum: Troubleshooting
Topic: VNC Viewer GUI Too Big!
Replies: 4
Views: 107

Re: VNC Viewer GUI Too Big!

Running VNC Viewer bundled with current Raspian Buster on the Pi Zero side, and the Windows version of VNC Viewer on my Win 10 PC. Which one of the "Viewer" words need to be replaced with "Server" ?? I know where to download at least 4 different Windows VNC Viewers so your rating for "specificity" ...
by topguy
Mon Dec 02, 2019 3:02 pm
Forum: Troubleshooting
Topic: Autostart works on Pi 2, but not Pi zero
Replies: 9
Views: 158

Re: Autostart works on Pi 2, but not Pi zero

Could you tell me what the "2>&1" is supposed to do though? You are piping "stderr" ( standard error (2) ) into "stdout" ( standard out (1) ) so that you get both in the log file. And if you go WT* is "standard out" : https://linux.die.net/diveintopython/html/scripts_and_streams/stdin_stdout_stderr...
by topguy
Mon Dec 02, 2019 11:02 am
Forum: Python
Topic: Making MFRC522 key from a string help or store the key from the card to a value
Replies: 1
Views: 69

Re: Making MFRC522 key from a string help or store the key from the card to a value

A secret key can never be read from the card. ( it would not be secret if you could )

I'm assuming you are using Mifare-1 ( classic ) tags or else what you are doing makes no sense.

Are you using some library for the MFRC522 ? which one ?
by topguy
Mon Dec 02, 2019 10:54 am
Forum: Troubleshooting
Topic: VNC Viewer GUI Too Big!
Replies: 4
Views: 107

Re: VNC Viewer GUI Too Big!

So which VNC-viewer are we talking about and where are you running it ? I'm assuming the VNC server ( which one? ) are running on the Pi and the viewer are running on another computer.
by topguy
Mon Dec 02, 2019 10:47 am
Forum: Troubleshooting
Topic: Autostart works on Pi 2, but not Pi zero
Replies: 9
Views: 158

Re: Autostart works on Pi 2, but not Pi zero

You should log the output from your script somewhere, then you might see in the log what is the problem.
by topguy
Sat Nov 30, 2019 8:11 pm
Forum: Networking and servers
Topic: Backup Server on Different IP ?
Replies: 5
Views: 170

Re: Backup Server on Different IP ?

What it sounds to me you are looking for is a "Load balancer" or "High availability proxy", but for it to work for you and your buddy, this load balancer has to live somewhere else on the internet (cloud). And most of these services are not meant for hobbyists, they have a price. You both will redir...

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