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by W. H. Heydt
Tue Aug 21, 2018 1:49 am
Forum: Beginners
Topic: can't boot PI3 after dropping the heat sink onto the board by accident
Replies: 16
Views: 272

Re: can't boot PI3 after dropping the heat sink onto the board by accident

Note that turning things off, and unplugging them, doesn't always guarantee safety either. When I was about 12, my uncle gave me a variable DC power supply. It had no side covers and was very heavy, but otherwise functioned perfectly, converting ~250VAC, into anywhere from 1VDC to 32VDC and was abl...
by W. H. Heydt
Tue Aug 21, 2018 1:44 am
Forum: Beginners
Topic: can't boot PI3 after dropping the heat sink onto the board by accident
Replies: 16
Views: 272

Re: can't boot PI3 after dropping the heat sink onto the board by accident

There's no slack to cut. Day 1, electronics 101 has three things to learn. Polarity Ohms Law Power off before changing things that's it. That's the syllabus for the first day of the course. Until you run into equipment that runs 24/7 and is built to tolerate hot swap components. FYI...by design tha...
by W. H. Heydt
Mon Aug 20, 2018 11:37 pm
Forum: Beginners
Topic: measure height elevation
Replies: 5
Views: 105

Re: measure height elevation

Hi, Is this possible to measure height elevation with a high accuracy with a RPi ? I'm not looking for a pressure sensor that wouldn't provide sufficient accuracy. I want to be able to measure an elevation in the order of 1 or 2 cm. What interests me is the relative height from point A to point B n...
by W. H. Heydt
Mon Aug 20, 2018 7:30 pm
Forum: General discussion
Topic: Kernel updates
Replies: 5
Views: 127

Re: Kernel updates

I always thought that kernel updates were done with rpi-update. So, what exactly is raspberrypi-kernel via apt-get updating? Rpi-update is used to get test and development versions for those willing to take the associated risks in order to make early use of new features. Hence the frequent threads ...
by W. H. Heydt
Mon Aug 20, 2018 4:07 am
Forum: Beginners
Topic: can't boot PI3 after dropping the heat sink onto the board by accident
Replies: 16
Views: 272

Re: can't boot PI3 after dropping the heat sink onto the board by accident

Why would anyone try to mount a heatsink with the board powered up? There's too much chance to short 3V3 to GND, short 5V to 3V3 or short 5V to GND. Shorting pins is a good way to shoot a Raspberry Pi very (and unreviveably) dead. When I worked for a Regional Bell Operating Company (aka RBOC), some...
by W. H. Heydt
Mon Aug 20, 2018 4:02 am
Forum: General discussion
Topic: surprising result after applying +12V to +5Vin
Replies: 4
Views: 256

Re: surprising result after applying +12V to +5Vin

Neither SD interface, nor the audio output run off the 5v "rail". There are circuits on the board that convert to other voltages from the 5v supply. Those converters probably blew up rather can pass the overvoltage to anything connected to them.
by W. H. Heydt
Sun Aug 19, 2018 4:21 pm
Forum: Beginners
Topic: 64 gb mini sd card
Replies: 6
Views: 153

Re: 64 gb mini sd card

drgeoff wrote:
Sun Aug 19, 2018 3:43 pm
grandpa wrote:
Sun Aug 19, 2018 12:41 pm
I tried to use a 64gb mini sd card to setup my pi zero.
For future reference get the terminology correct. It is a micro-SD card.
And GB rather than gb. (Lower case 'b' is bits, uppercase is bytes.)
by W. H. Heydt
Fri Aug 17, 2018 10:24 pm
Forum: General discussion
Topic: mariadb
Replies: 6
Views: 169

Re: mariadb

Since you can login in using flags "-u root" and '-P" (it prompts for password, doesn't it?) then your root password is set up.
by W. H. Heydt
Fri Aug 17, 2018 8:20 pm
Forum: Off topic discussion
Topic: With software, there's always a better way to do it
Replies: 24
Views: 565

Re: With software, there's always a better way to do it

Better in this case means that your time and energy are not wasted on inefficient software. If you're waiting for your machine to finish a task, that's lost productivity and probably wasted electricity too. While there are some specific--and not particularly common--exceptions, machine time in chea...
by W. H. Heydt
Thu Aug 16, 2018 7:12 pm
Forum: General discussion
Topic: Help identifying a Rpi?
Replies: 20
Views: 440

Re: Help identifying a Rpi?

I do like the idea though of running emulation through my Pi I just would want a way to dual boot to the emulators or my Kodi on start of the system. You could either run the simulators from the same SD card or shut down and swap SD cards to run your Pi differently. The other route is to use an OS ...
by W. H. Heydt
Thu Aug 16, 2018 5:28 pm
Forum: Off topic discussion
Topic: Nomenclature of the Future
Replies: 9
Views: 263

Re: Nomenclature of the Future

jamesh wrote:
Thu Aug 16, 2018 11:09 am
To be honest it seems unlikely that there will be a Pi4 without wireless.
Not even as an "upgraded" "Pi2B to reduce the number of different SoCs that need to be made (the very reason that a Pi2Bv1.2 is really a Pi3B variant)?
by W. H. Heydt
Thu Aug 16, 2018 5:24 pm
Forum: Off topic discussion
Topic: With software, there's always a better way to do it
Replies: 24
Views: 565

Re: With software, there's always a better way to do it

Some of it does ship in products and once I'm gone it may never get touched again. Then again, most software doesn't have a very long shelf life anyway and will be replaced in the near future. Sounds like famous last words. As for that last point...that varies all over the map. One program I wrote ...
by W. H. Heydt
Thu Aug 16, 2018 5:21 pm
Forum: Off topic discussion
Topic: With software, there's always a better way to do it
Replies: 24
Views: 565

Re: With software, there's always a better way to do it

2) Most of the optimization work I've done on open source code is not modifying the original code, but tossing it out and starting from a clean slate to replace it. I have made changes to FOSS code that ships in products and the project management team understands the GPL implications. I asked abou...
by W. H. Heydt
Thu Aug 16, 2018 3:55 pm
Forum: Off topic discussion
Topic: With software, there's always a better way to do it
Replies: 24
Views: 565

Re: With software, there's always a better way to do it

"Optimization" to programming is rather like "efficiency" to engineering. It depends on what you want to "effish". Pure optimization may or may not be good, depending on context. Can the resultant code be maintained, and--especially--maintained by mere mortals, rather than requiring your god-like se...
by W. H. Heydt
Thu Aug 16, 2018 4:53 am
Forum: Off topic discussion
Topic: Nomenclature of the Future
Replies: 9
Views: 263

Re: Nomenclature of the Future

I surmise that I was unclear...

It is not speculation on what the naming convention might be. It is a suggestion for what the naming convention should be.
by W. H. Heydt
Thu Aug 16, 2018 3:35 am
Forum: Off topic discussion
Topic: Nomenclature of the Future
Replies: 9
Views: 263

Nomenclature of the Future

(If anyone is looking to speculate on features in future Pis...this is NOT the thread you're looking for.) I've been mulling over putting up a thread to make the case for a Pi2B+/Pi2Bv1.3. Part of the problem is that the Pi2Bv1.2 is really a slowed down wireless Pi3B and a Pi2B+/Pi2Bv1.3 would be a ...
by W. H. Heydt
Wed Aug 15, 2018 11:05 pm
Forum: General discussion
Topic: Help identifying a Rpi?
Replies: 20
Views: 440

Re: Help identifying a Rpi?

Imperf3kt wrote:
Wed Aug 15, 2018 10:35 pm
If your friend can open the case, it is printed on the underside of the board.
Try...the top of the board, right next the GPIO header pins.
by W. H. Heydt
Wed Aug 15, 2018 11:02 pm
Forum: General discussion
Topic: Display options for the Pi 3
Replies: 6
Views: 159

Re: Display options for the Pi 3

(doesn't ship to my country otherwise was perfect). If you fill in and enable your location (country, at the very least) it will be far easier for people to suggest suppliers. I am looking at a more DIY thing so that we can use a bunch of different sized OEM screens. These OEM smartphone screens ar...
by W. H. Heydt
Wed Aug 15, 2018 4:18 pm
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 9
Views: 437

Re: Good news.... Well, maybe...

Can you think of *any* feature--and, particulary, I/O feature--that has ever been removed from a Pi? P5 - the pcm audio interface, appeared on Pi 1 rev 2, disappeared on B+ But analog audio out persisted, combined with the TRRS jack with the analog video. So the *functional* feature is retained.
by W. H. Heydt
Wed Aug 15, 2018 4:15 pm
Forum: Beginners
Topic: Power rpi with 2 ports from usb hub
Replies: 4
Views: 117

Re: Power rpi with 2 ports from usb hub

hippy wrote:
Wed Aug 15, 2018 10:49 am
In theory; yes. That was how things were sometimes done with older USB HDD when they required more current than a single USB port could supply.
I have a USB 2.0 CD/DVD drive/CD burner that works that way. It would probably run fine with a single connection if you aren't writing a CD.
by W. H. Heydt
Wed Aug 15, 2018 4:03 am
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 9
Views: 437

Re: Good news.... Well, maybe...

A good example of this can be seen in the SD and uSD cards the Pi uses. 16MB cards are impossible to find (except in my drawer of unused electronic junk) and anything less than 8GB is no longer manufactured due to the costs involved vs sales making their manufacture less than economical. Are you su...
by W. H. Heydt
Wed Aug 15, 2018 3:58 am
Forum: General discussion
Topic: Can I use USB OTG with a network share?
Replies: 4
Views: 140

Re: Can I use USB OTG with a network share?

No Pi board that incorporates a LAN chip can be a client device. The LAN chip is set to be a USB master only. All B-series Pi (B, B+, Pi2B (both versions), Pi3B, Pi3B+) have a LAN chip. Only boards with the SoC USB port directly accessible (Pi0, Pi0W, A, A+) can be USB client devices. Only boards wi...
by W. H. Heydt
Wed Aug 15, 2018 2:36 am
Forum: Beginners
Topic: How much server in a raspberry
Replies: 4
Views: 131

Re: How much server in a raspberry

What a great and clear response, thank you so much!!! I have a last questions. How can I now the SoC from my raspberry? I bought this one: https://www.amazon.fr/gp/product/B00STVN0K4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 You can only guess from that link. If you mouse over the image of the PCB...
by W. H. Heydt
Wed Aug 15, 2018 12:45 am
Forum: Beginners
Topic: How much server in a raspberry
Replies: 4
Views: 131

Re: How much server in a raspberry

Well...you certainly won't damage the Pi by using "too much memory" or running too many programs. Things will just get slower, for a variety of reasons. One consideration here is which version of the Pi2B you have as the SoC was changed between the Pi2Bv1.1 and the Pi2Bv1.2, with the later being abo...
by W. H. Heydt
Tue Aug 14, 2018 11:12 pm
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 9
Views: 437

Re: Good news.... Well, maybe...

...where could they put it? Simple - take away the micro SDHC card slot & put it underneath.... ;) (We can dream........) Sounds more like a nightmare to me. Can you think of *any* feature--and, particulary, I/O feature--that has ever been removed from a Pi? (Not counting a completely new design th...

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