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by pfletch101
Sat Jan 11, 2020 5:21 pm
Forum: General discussion
Topic: Remote desktop error
Replies: 2
Views: 137

Re: Remote desktop error

AFAIK, Remote Desktop is a Windows program which allows a Windows system to connect to and control another Windows system. To connect to your Pi's (virtual) desktop from your Windows system, you would normally need to download and install the RealVNC client software from https://www.realvnc.com/en/c...
by pfletch101
Sun Dec 22, 2019 8:23 pm
Forum: Beginners
Topic: Cannot get headless SSH to work.
Replies: 17
Views: 600

Re: Cannot get headless SSH to work.

Windows (some versions on some days with certain planetary alignments) can be funky about creating zero length files. I.e., what I am arguing is that whichever poster was saying that creating a zero length file doesn't work did, probably, fail to create any file at all. That could be. I obviously c...
by pfletch101
Sun Dec 22, 2019 4:39 pm
Forum: Beginners
Topic: Cannot get headless SSH to work.
Replies: 17
Views: 600

Re: Cannot get headless SSH to work.

rpdom wrote:
Sun Dec 22, 2019 4:25 pm
Zero length file works for me every time.
Out of interest, do you create the file on a Windows system or on a Pi or other Unix system? The issue I had could be related to something that Windows does (or didn't/doesn't do) in creating 'empty' directory entries.
by pfletch101
Sun Dec 22, 2019 4:18 pm
Forum: Beginners
Topic: Cannot get headless SSH to work.
Replies: 17
Views: 600

Re: Cannot get headless SSH to work.

You say you created an 'empty' ssh file. Do you mean that literally? My experience is that a literally empty (zero length) file doesn't work to enable ssh on first boot. The file must contain at least one character (which can be a space character). Should work even if the file is empty I agree that...
by pfletch101
Sun Dec 22, 2019 3:23 pm
Forum: Other projects
Topic: Manufacturing Pacing Program
Replies: 7
Views: 466

Re: Manufacturing Pacing Program

In addition, the number of people at a station varies day to day, so based on how many people are working on assembly, the countdown time is more or less. Surely, the reasonable minimum time needed to complete the assembly of a part is a constant . I don't suddenly become able to work faster becaus...
by pfletch101
Sun Dec 22, 2019 3:02 pm
Forum: Beginners
Topic: Cannot get headless SSH to work.
Replies: 17
Views: 600

Re: Cannot get headless SSH to work.

You say you created an 'empty' ssh file. Do you mean that literally? My experience is that a literally empty (zero length) file doesn't work to enable ssh on first boot. The file must contain at least one character (which can be a space character).
by pfletch101
Sun Dec 22, 2019 2:52 pm
Forum: Beginners
Topic: how to get a systemd mount to come up automatically?
Replies: 4
Views: 246

Re: how to get a systemd mount to come up automatically?

Systemd is probably trying to start it before a prerequisite service (probably some aspect of networking) is up and running. Try adding After=network-online.target to the [Unit] section of the systemd unit file. This should actually wait until the network is fully up and running. Other network targe...
by pfletch101
Wed Dec 18, 2019 3:31 pm
Forum: General discussion
Topic: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!
Replies: 90
Views: 3163

Re: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!

PeterO, Programme flow is not invisibly affected by line indentation,... Certainly it is. Python block delimiting is done with new lines and spaces. Non-printing characters. That is to say invisible. I have programmed in many languages, from Apple and 8088/6 assembly language, through Fortran, vari...
by pfletch101
Tue Dec 17, 2019 3:13 pm
Forum: Troubleshooting
Topic: RealVNC has suddenly become flaky
Replies: 9
Views: 362

Re: RealVNC has suddenly become flaky

The RealVNC problems seem to be specific to my main desktop system. I can't retest RealVNC from elsewhere with the original Pi because installing TightVNC automatically uninstalls the RealVNC server, but there are no apparent problems connecting to a different Pi after installing the RealVNC viewer ...
by pfletch101
Mon Dec 16, 2019 9:45 pm
Forum: Troubleshooting
Topic: RealVNC has suddenly become flaky
Replies: 9
Views: 362

Re: RealVNC has suddenly become flaky

I don't use Chrome - Google knows enough about me already. I have now installed TightVNC on both ends, which seems to be working for now. However, its viewer has the supremely irritating 'feature' of requiring that you enter the TightVNC connection password every time you want to connect - there app...
by pfletch101
Mon Dec 16, 2019 8:51 pm
Forum: Troubleshooting
Topic: RealVNC has suddenly become flaky
Replies: 9
Views: 362

Re: RealVNC has suddenly become flaky

It gets worse! I uninstalled the viewer from my Windows system, removed all traces of it that I could find in the Registry, rebooted, and reinstalled the latest version. I could (and did) connect to my running Pi without problems. I just checked again, and the viewer is back to the same misbehavior.
by pfletch101
Mon Dec 16, 2019 7:55 pm
Forum: General discussion
Topic: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!
Replies: 90
Views: 3163

Re: Please help! /// Seeking programming experience advice!

You wrote, in a message to me: Mainly you will get the advice that the used library is obsolete, having been written for Python2. The useful thing is the pointer to a working one... Or you -once again- have been fooled by python choosing a variable type that you did not intend to use that way... Th...
by pfletch101
Mon Dec 16, 2019 6:39 pm
Forum: General discussion
Topic: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!
Replies: 90
Views: 3163

Re: Please help! /// Seeking programming experience advice!

I don't think that I have said anything that could reasonably lead you to assume that I am an idiot! Did I ever say something suitable to let you think that? You wrote, in a message to me: Mainly you will get the advice that the used library is obsolete, having been written for Python2. The useful ...
by pfletch101
Mon Dec 16, 2019 4:19 pm
Forum: General discussion
Topic: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!
Replies: 90
Views: 3163

Re: Please help! /// Seeking programming experience advice!

Yes, but! :) Mainly you will get the advice that the used library is obsolete, having been written for Python2. The useful thing is the pointer to a working one... Or you -once again- have been fooled by python choosing a variable type that you did not intend to use that way... I don't think that I...
by pfletch101
Mon Dec 16, 2019 3:09 pm
Forum: Troubleshooting
Topic: RealVNC has suddenly become flaky
Replies: 9
Views: 362

Re: RealVNC has suddenly become flaky

One thing I've noticed over the years is that using VNC to connect to my Pi from my Windows machine is that using names can be a problem but ip addresses always work It might be just windows going thru one of its phases with LAN names Thanks for the comment! As you imply, Windows networking is a PI...
by pfletch101
Mon Dec 16, 2019 3:06 pm
Forum: General discussion
Topic: PLEASE HELP!! /// SEEKING PROGRAMMING EXPERIENCE ADVICE!!
Replies: 90
Views: 3163

Re: Please help! /// Seeking programming experience advice!

If you start learning about error messages early on there is no reason for it to take years to get the required experience. While google is useful, some of us have been writing code (*) for long enough to remember how to debug code without googling for the answer. If you are "frequently lost" witho...
by pfletch101
Mon Dec 16, 2019 2:21 pm
Forum: Troubleshooting
Topic: RealVNC has suddenly become flaky
Replies: 9
Views: 362

RealVNC has suddenly become flaky

I have a number of Pis which I run headless, using RealVNC, running on a Windows 10 desktop, and have done things this way without significant problems since starting to work with Pis, almost a year ago. Yesterday, when I fired up the RealVNC viewer to connect to my 'workhorse' Pi, I was unable to d...
by pfletch101
Mon Dec 16, 2019 2:01 am
Forum: Beginners
Topic: Rocker button. Where are On-Off?
Replies: 8
Views: 375

Re: Rocker button. Where are On-Off?

I bought a Raspberry Pi 3 with a rocker button on the power supply cable. I did not understand how it works because on the switch there is nothing indicated where is the On and Off; since there is no video connected and in the absence of lights and fans it is not clear when Raspberry is working. As...
by pfletch101
Sun Dec 15, 2019 10:11 pm
Forum: General discussion
Topic: Doesn't the Raspberry case disturb the wifi signal?
Replies: 3
Views: 273

Re: Doesn't the Raspberry case disturb the wifi signal?

Hey guys I am thinking of buying an aluminum cover. Wouldn't that disturb the Raspberry (4b) wifi and Bluetooth signal? I am using a Flirc case for my 4B, and I run it headless over WiFi without any problems. However, it is just the other side of an interior wall from the fairly high-end WiFi acces...
by pfletch101
Sun Dec 15, 2019 9:56 pm
Forum: General discussion
Topic: SD card or Micro SD card?
Replies: 17
Views: 726

Re: SD card or Micro SD card?

Okay, it can be read correctly, but it is ambiguous. (What is the scope of "original"?) Two possible alternatives: The original Raspberry Pi Model A and original Raspberry Pi Model B require full-size SD cards. All newer models of Raspberry Pi require micro SD cards. The original Raspberry Pi Model...
by pfletch101
Thu Dec 12, 2019 6:18 pm
Forum: Raspbian
Topic: Buster bug report thread
Replies: 289
Views: 56202

Re: Buster bug report thread

emma1997 wrote:
Thu Dec 12, 2019 6:15 pm
Space character %20 is hex (aka $20, 0x20, 20H, 32dec 0b0010000 etc). IIRC octal would be 040.
You're right, of course. Put it down to old age creeping on apace. Original corrected.
by pfletch101
Thu Dec 12, 2019 6:10 pm
Forum: Raspbian
Topic: Buster bug report thread
Replies: 289
Views: 56202

Re: Buster bug report thread

@DougieLawson: i hope that is a joke. what kind of feature should it be? usually the computer has to submit to the human. for what else do we have computers ;) All sorts of potential and actual problems are introduced by file names containing spaces. Even Windows (which is their main perpetrator) h...
by pfletch101
Wed Dec 04, 2019 3:00 pm
Forum: Automation, sensing and robotics
Topic: Detecting an appliance is in use
Replies: 30
Views: 1324

Re: Detecting an appliance is in use

Current should only flow in the gnd cable under fault conditions (and then usually only very transiently, until the breaker or fuse blows!). There is thus no reason to include the gnd cable in a current sensor if you choose to monitor the return current. Where I am located only true for RCD/GFI ins...
by pfletch101
Tue Dec 03, 2019 4:11 pm
Forum: Automation, sensing and robotics
Topic: Detecting an appliance is in use
Replies: 30
Views: 1324

Re: Detecting an appliance is in use

Note it's quite easy to split a typical 2 wire lamp cord to clamp one of the wires. Even with 3 wire cables it's not hard to separate out the individuals. In that case you do have to make sure to use the live wire as trejan mentions or make sure to pair the other two (neutral & gnd) and treat as on...
by pfletch101
Tue Dec 03, 2019 3:33 pm
Forum: General discussion
Topic: Skype on Raspberry Pi 4
Replies: 6
Views: 1533

Re: Skype on Raspberry Pi 4

Botspot wrote:
Thu Nov 28, 2019 7:48 pm
Pidgin is a universal chat client. You can install it using apt. There is a third party plugin for Skype.
Does Pidgin support video chat/conferencing?

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