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by W. H. Heydt
Mon Jul 06, 2020 2:06 am
Forum: Beginners
Topic: Autonomous Nitro RC car
Replies: 5
Views: 187

Re: Autonomous Nitro RC car

Nitro? As in nitromethane? Sometimes fuel dragster fuel additive? Also tested--with disastrous results--as a rocket monopropellant? Yes, also known as hobby RC fuel. Per G. Harry Stine ("Rocket Power and Space Flight", 1956), nitromethane as a monopropellant has a nasty habit of "flashing back", th...
by W. H. Heydt
Mon Jul 06, 2020 2:02 am
Forum: Beginners
Topic: Creating an .exe equivalent on Raspberry Pi
Replies: 7
Views: 351

Re: Creating an .exe equivalent on Raspberry Pi

Traditionally, and inherited from unix, Linux doesn't really pay any attention to file extensions. By convention, source files have an extension to identify what language it is written in, thus you will see ".py" or ".c" files (for Python and C, respectively). Sometimes, compiler output files (objec...
by W. H. Heydt
Sun Jul 05, 2020 10:29 pm
Forum: General discussion
Topic: Interesting discovery re Raspberry Pi lightning bolt power warning.
Replies: 15
Views: 598

Re: Interesting discovery re Raspberry Pi lightning bolt power warning.

I shut off the pi and unplugged the power supply from its receptacle on the power bar and inserted the power supply into another receptacle on the same power bar. Rebooted, voila no more problem It sounds more like placebo effect to me. Which socket you use on the power strip can't affect the outpu...
by W. H. Heydt
Sun Jul 05, 2020 8:28 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 527
Views: 210752

Re: What was your first computer?

Hmmm... I suppose I ought to mention that the first machine my sisters got to write programs on was an IBM 7094. Card decks were loaded to tape on a 7040. The tapes were then run on the 7094 and the output tape was taken back to the 7040 to print the outputs. If it didn't run Linux or at least BASI...
by W. H. Heydt
Sun Jul 05, 2020 5:50 pm
Forum: General discussion
Topic: Cutie Pi - what do you guys think about it?
Replies: 18
Views: 2407

Re: Cutie Pi - what do you guys think about it?

Since it's mentioned in the forum that the CM4 might have a different pinout, and we are not clear about either battery life or active cooling situation, our plan is to support CM3/CM3+, and working on a swappable carrier board for CM4 when the needed information is available. It's not that the pin...
by W. H. Heydt
Sun Jul 05, 2020 4:23 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 527
Views: 210752

Re: What was your first computer?

Hmmm... I suppose I ought to mention that the first machine my sisters got to write programs on was an IBM 7094. Card decks were loaded to tape on a 7040. The tapes were then run on the 7094 and the output tape was taken back to the 7040 to print the outputs.
by W. H. Heydt
Sun Jul 05, 2020 4:16 pm
Forum: Troubleshooting
Topic: Help to insta windows 10 arm in rasberypi 4b
Replies: 13
Views: 451

Re: Help to insta windows 10 arm in rasberypi 4b

Hello, I am looking for a system image windows 10 arm Iso in which it will work with momin raspberry, which is my 4B version. I need a ready iso image to get installed with the win32 image program. Windows 10 ARM is being developed for the Qualcom Snapdragon chips. As such, it won't run on a Raspbe...
by W. H. Heydt
Sun Jul 05, 2020 4:10 pm
Forum: General discussion
Topic: Connect Rpi to desktop/server serial mainboard header
Replies: 21
Views: 591

Re: Connect Rpi to desktop/server serial mainboard header

You wouldn't. Both the PC header and the Pi are USB master devices. As such they won't communicate that way. *If* one of them were a slave device, then you would connect them by a USB cable. If your Pi is a Pi0 or Pi0W, its USB port can be configured to be a slave device. If your Pi is a Pi4B, the ...
by W. H. Heydt
Sun Jul 05, 2020 5:12 am
Forum: Beginners
Topic: Autonomous Nitro RC car
Replies: 5
Views: 187

Re: Autonomous Nitro RC car

Nitro? As in nitromethane? Sometimes fuel dragster fuel additive? Also tested--with disastrous results--as a rocket monopropellant?
by W. H. Heydt
Sun Jul 05, 2020 4:03 am
Forum: General discussion
Topic: How to improve VNC Viewer experience?!
Replies: 6
Views: 305

Re: How to improve VNC Viewer experience?!

I am using VNC Viewer to connect remotely to my Raspberry Pi 3 B+ via Wifi. I am trying to find ways to improve the experience, especially when using Chromium and video playback. Anyone has any suggestions?! What would be ideal settings for GPU Memory?! How "remotely"? If you're on the same LAN, co...
by W. H. Heydt
Sun Jul 05, 2020 1:58 am
Forum: Troubleshooting
Topic: Linux / Unix novice unable to resolve issue with file system account rights.
Replies: 5
Views: 209

Re: Linux / Unix novice unable to resolve issue with file system account rights.

As noted, "ls -l" will show you what account created and what account owns a given directory or file. "chown" (CHange OWNer) can alter that. the 'pi' account is set up able to use the 'sudo' prefix to allow it to run commands as if it is root. (Warning: doing things as root can destroy your system. ...
by W. H. Heydt
Sun Jul 05, 2020 1:52 am
Forum: Camera board
Topic: Where is the IR filter placed?
Replies: 1
Views: 171

Re: Where is the IR filter placed?

The PiCamera v1 and v2 have the IR filter built into them. The NoIR versions of those don't have an IR filter. The RPF HQ camera has the IR filter as part of the camera, so the lenses don't need it. There isn't a NoIR version of the HQ Camera, but you can remove the filter. That will void the warran...
by W. H. Heydt
Sun Jul 05, 2020 1:49 am
Forum: General discussion
Topic: Connect Rpi to desktop/server serial mainboard header
Replies: 21
Views: 591

Re: Connect Rpi to desktop/server serial mainboard header

You wouldn't. Both the PC header and the Pi are USB master devices. As such they won't communicate that way. *If* one of them were a slave device, then you would connect them by a USB cable. If your Pi is a Pi0 or Pi0W, its USB port can be configured to be a slave device. If your Pi is a Pi4B, the p...
by W. H. Heydt
Sun Jul 05, 2020 12:13 am
Forum: General discussion
Topic: Finding the appropriate lens for my camera(s)
Replies: 3
Views: 154

Re: Finding the appropriate lens for my camera(s)

Wide angle is going to be a problem. C-mount was widely used for 16mm cine, so not only do most such lenses have to cover more area, but in cine work one generally uses a smaller field of view than for still work. CS-mount is typically used for digital video so your coverage area may be more likely ...
by W. H. Heydt
Sat Jul 04, 2020 8:15 pm
Forum: Beginners
Topic: Will cases meant for the rpi 3b+ work on the 3b?
Replies: 1
Views: 64

Re: Will cases meant for the rpi 3b+ work on the 3b?

Yes. The all the external connectors on a Pi3B are in the same places and the same size as on a Pi3B+. If you have an early Pi3B, the height of the processor package will be different, but more recently made Pi3Bs are using the same SOC packaging as the Pi3B+ (the B0 stepping of the BCM2837). Nearly...
by W. H. Heydt
Sat Jul 04, 2020 7:19 pm
Forum: General discussion
Topic: Recharable battry for DS3231
Replies: 8
Views: 356

Re: Recharable battry for DS3231

Yes, I know, and this is not an important issue, but I still would like to have an oppinion. Understood, but without a charging circuit on the RTC board--and given the typical size, there is no room for such--it would be kind of pointless. The only option would be to swap batteries (then reboot and...
by W. H. Heydt
Sat Jul 04, 2020 6:55 pm
Forum: Troubleshooting
Topic: Help to insta windows 10 arm in rasberypi 4b
Replies: 13
Views: 451

Re: Help to insta windows 10 arm in rasberypi 4b

[DELETED --whh]
by W. H. Heydt
Sat Jul 04, 2020 4:45 pm
Forum: Beginners
Topic: Purchasing a RPi: How much GB RAM would I need?
Replies: 6
Views: 402

Re: Purchasing a RPi: How much GB RAM would I need?

RaTTuS wrote: ↑
Sat Jul 04, 2020 10:45 am
 I was going to say 1G as that will probably be enough anyway - it's all down to how you code.
Well...except that the Pi4B1 isn't in the retail channels any more. The Pi4B2 is now the "default'/entry level Pi4B.
by W. H. Heydt
Sat Jul 04, 2020 4:37 pm
Forum: General discussion
Topic: Recharable battry for DS3231
Replies: 8
Views: 356

Re: Recharable battry for DS3231

I can understand the desire for a rechargeable on general principles, but if the Pi is pretty much always on, there will be no drain on the battery and a non-rechargeable will probably last longer than the Pi will be in service for that task. Even unpowered, the RTCs I use take a CR1220 and the clai...
by W. H. Heydt
Sat Jul 04, 2020 4:32 pm
Forum: General discussion
Topic: Finding the appropriate lens for my camera(s)
Replies: 3
Views: 154

Re: Finding the appropriate lens for my camera(s)

But some vendors don't specify lens "quality", then you enter dark zone. Buy lenses made by manufacturers you trust. This may be ones that have good reputations in the literature. Also helps to work with a vendor whom you trust to supply what you're asking for. Unless you want to spend an arm and l...
by W. H. Heydt
Sat Jul 04, 2020 4:26 pm
Forum: General discussion
Topic: How do I get vi back
Replies: 15
Views: 527

Re: How do I get vi back

Help! There's a bug in my bug compatibility code! Do you work for Microsoft? :) NO. At one time I managed a project that was, in essence, a PDF engine, but not built from Adobe parts. We occasionally had to decide whether to render things properly (according to the intent of the file's author and t...
by W. H. Heydt
Sat Jul 04, 2020 5:10 am
Forum: General discussion
Topic: How do I get vi back
Replies: 15
Views: 527

Re: How do I get vi back

rpdom wrote: ↑
Sat Jul 04, 2020 5:08 am
 What issues do you have with using vim? When I use it it works pretty much the same as vi did when I first used it nearly 30 years ago.
Likewise...but nearly 50 years ago.
by W. H. Heydt
Sat Jul 04, 2020 5:06 am
Forum: General discussion
Topic: How do I get vi back
Replies: 15
Views: 527

Re: How do I get vi back

In Raspbian/RPiOS it's always been vim. Vi has just been a link to vim. Try setting /usr/bin/vi as your editor. Changes in behavior may be in the config file. Look in--or create--a file named "~/.vimrc".

Alternatively, you might consider installing "nvi".
by W. H. Heydt
Sat Jul 04, 2020 3:02 am
Forum: Beginners
Topic: New to Raspberry Pi: Errors and weird messages on first boot
Replies: 22
Views: 661

Re: New to Raspberry Pi: Errors and weird messages on first boot

It looks like in your first screenshot you had network connectivity issues during the post-install configuration. But on the back of that packaging the first 2 commands perform the same function as the post-install where you encountered the issue. It is generally preferred to do "apt-get update" an...
by W. H. Heydt
Sat Jul 04, 2020 2:23 am
Forum: General discussion
Topic: The Raspberry Pi 4 is missing one small connector
Replies: 10
Views: 579

Re: The Raspberry Pi 4 is missing one small connector

scruss wrote: ↑
Sat Jul 04, 2020 2:01 am
 No, the J2 header's the very useful run/reset header
There you go!

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