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by W. H. Heydt
Fri Jun 11, 2021 10:03 pm
Forum: General discussion
Topic: ssd disk
Replies: 15
Views: 421

Re: ssd disk

Yes, you are right, The ssd ´s speed i mentioned is indeed in MB (megabytes) instead of Mbits. So this should be okay then. I saw there are actually very fast ssd´s wich reach a much higher speed then the Pi 4´s maximum. So buying those just for the the Pi4 would be of no use then. Correct. That's ...
by W. H. Heydt
Fri Jun 11, 2021 6:59 pm
Forum: General discussion
Topic: ssd disk
Replies: 15
Views: 421

Re: ssd disk

rpdom wrote:
Fri Jun 11, 2021 6:51 pm
W. H. Heydt wrote:
Fri Jun 11, 2021 6:47 pm
so the true limit is the single PCIe lane, at 4 Mt/s.

(Side note... an 'm' prefix is 'milli-', so 1mb/s would be 0.001 b/s.)
That would be very slow. Is the "t" in Mt/s "tortoises"?
"t" is "transfers".
by W. H. Heydt
Fri Jun 11, 2021 6:47 pm
Forum: General discussion
Topic: ssd disk
Replies: 15
Views: 421

Re: ssd disk

I was thinking of something like the samsung portable SSD T5 wich has read speed of 540 mb/s. I could go for higher speed but the usb bus of the Pi 4 is limited as far as i know to 480 mb/s. Warning! Mixing units! SSD speeds are usually given in MegaBYTES/sec (MB/s), while USB speeds are given in M...
by W. H. Heydt
Fri Jun 11, 2021 6:10 pm
Forum: Beginners
Topic: Connecting a Pi wireless to another Pi without WiFi
Replies: 9
Views: 346

Re: Connecting a Pi wireless to another Pi without WiFi

Hello all! I'm trying to set up a system where I have one main Raspberry Pi that can control other Pi's GPIOs. So far, I have the following: 1) The main Pi is connected directly to another Pi via UART 2) The main Pi can wirelessly control another Pi's GPIO using WiFi (gpiozero library) For the thir...
by W. H. Heydt
Fri Jun 11, 2021 6:06 pm
Forum: General discussion
Topic: Simulation on Raspberry Pi
Replies: 6
Views: 283

Re: Simulation on Raspberry Pi

One does not "simulate" a program. One runs a program or one runs a program to simulate something. On the other had, one *does* simulate (often mis-cited as "emulate") a different hardware/OS platform. So for the OP...what hardware and OS does the program to run under a simulato...
by W. H. Heydt
Fri Jun 11, 2021 6:02 pm
Forum: General discussion
Topic: Porting old Pi3 distribution to pi4.
Replies: 27
Views: 711

Re: Porting old Pi3 distribution to pi4.

The best way to keep this system maintainable would be to identify the complex app's requirements and repackage them so they can be moved to an upgraded system. This is a lot of work, but it only needs to be done and documented once to allow the complex app to live on. If the app relies on external...
by W. H. Heydt
Fri Jun 11, 2021 5:21 pm
Forum: General discussion
Topic: Porting old Pi3 distribution to pi4.
Replies: 27
Views: 711

Re: Porting old Pi3 distribution to pi4.

It goes back deeper than the kernel. A lot of what is in the "BIOS" on a PC is in "firmware" files on the Pi. Using an earlier image will have files that don't know anything about the newer Pi. For one it won't know about critical memory timing details and there is a lot more. T...
by W. H. Heydt
Fri Jun 11, 2021 4:37 pm
Forum: General discussion
Topic: What is the Ethernet Jack model of raspberry pi 3B+?
Replies: 3
Views: 157

Re: What is the Ethernet Jack model of raspberry pi 3B+?

Unless there is visible damage to the socket, eg broken contact(s), it is unlikely (but not impossible) to be the cause of your problem. I would thoroughly check all other possibilities before attempting to replace the socket. Does the ethernet port work even though the LEDs do not illuminate? My n...
by W. H. Heydt
Fri Jun 11, 2021 4:34 pm
Forum: General discussion
Topic: Porting old Pi3 distribution to pi4.
Replies: 27
Views: 711

Re: Porting old Pi3 distribution to pi4.

I would hold that the OPs friend is setting himself up for serious problems in the relatively near future. I see two separate problems. The first is the claim that the software will not run on a Pi4B. (I'm not at all sure that's true, which will matter to the second issue.) This implies some sort of...
by W. H. Heydt
Wed Jun 09, 2021 8:57 pm
Forum: General discussion
Topic: Corporate identity Raspberry pi
Replies: 42
Views: 1457

Re: Corporate identity Raspberry pi

Very true, however I personally do have an issue with folks that are perfectly ok using words or labels "in group" and then turning around and objecting to others using them to label them. I think we, as a collective, are becoming more focused on finding malice or ill intent when none was...
by W. H. Heydt
Wed Jun 09, 2021 5:00 pm
Forum: General discussion
Topic: Corporate identity Raspberry pi
Replies: 42
Views: 1457

Re: Corporate identity Raspberry pi

Moved bit of rant away for moderation. Note to all, if you have a problem with a post (from anyone, including mods), report it, don't self moderate. To add, the poster found the use of a particular word, which is in very common usage around the planet, objectionable. I personally don't see a major ...
by W. H. Heydt
Tue Jun 08, 2021 11:36 pm
Forum: General discussion
Topic: SATA III to USB 3 adapter that can run 24/7?
Replies: 4
Views: 246

Re: SATA III to USB 3 adapter that can run 24/7?

I'm using the Eluteng adapter (well...3 of them, actually). Lsusb gives: Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge Did a reboot recently as part of a system update/upgra...
by W. H. Heydt
Mon Jun 07, 2021 6:12 pm
Forum: Beginners
Topic: What should I get?
Replies: 13
Views: 426

Re: What should I get?

I understand entirely about the Apple kids. Apple seems to be like that - I wouldn't personally touch one, far too restrictive - but they certainly appeal to the fashionistas. I could ask my two what they want a computer for, but they wouldn't know - they've only used MS Office type stuff on a lapt...
by W. H. Heydt
Mon Jun 07, 2021 4:49 am
Forum: General discussion
Topic: Lcd screen recommendations
Replies: 14
Views: 427

Re: Lcd screen recommendations

Gavinmc42 wrote:
Mon Jun 07, 2021 12:54 am
Main use is as a name badge
Better off with a Pico and ePaper display.
Don't remember who was doing them but should run very low power.
ePaper (so far as I've seen) don't do full color. Picos didn't exist when I made my name badges.
by W. H. Heydt
Mon Jun 07, 2021 4:46 am
Forum: General discussion
Topic: Corporate identity Raspberry pi
Replies: 42
Views: 1457

Re: Corporate identity Raspberry pi

Heater wrote:
Sun Jun 06, 2021 5:33 pm
Damn cats are going to destroy the planet.
You can tell that the Earth is not flat. If the Earth were flat, the cats would have pushed everything off the edges by now.
by W. H. Heydt
Mon Jun 07, 2021 4:45 am
Forum: General discussion
Topic: Corporate identity Raspberry pi
Replies: 42
Views: 1457

Re: Corporate identity Raspberry pi

Damn cats are going to destroy the planet. Just now I'm wearing a t-shirt picked up from the Computer History Museum in Mountain View. I has an diagram of Babbage's Analytical Engine on it. Am I geek now? Somewhere, I have a bunch of pictures of a Model B sitting in various places on that Babbage E...
by W. H. Heydt
Sun Jun 06, 2021 11:25 pm
Forum: General
Topic: RP2040 chips for sale
Replies: 14
Views: 807

Re: RP2040 chips for sale

lurk101 wrote:
Thu Jun 03, 2021 12:47 pm
craigevil wrote:
Thu Jun 03, 2021 8:40 am
Canakit has them, but they are only 1 per customer.
So you could place a $1 order + $5 shipping?
I ordered from Chicago Electronic Distributors. One RP2040, four line switches, two Picos, so about $25 before shipping.
by W. H. Heydt
Sun Jun 06, 2021 11:23 pm
Forum: General
Topic: Two flash modules possible?
Replies: 3
Views: 226

Re: Two flash modules possible?

Hello everyone, we are trying with my teammates to build a flight computer and we would like to use a Pico for that. We also want to log a lot of data but we don't like to use microSD card as much. Hence we prefer to use a flash for storing the logging data. But we will probably need more than the ...
by W. H. Heydt
Sun Jun 06, 2021 10:32 pm
Forum: General discussion
Topic: Lcd screen recommendations
Replies: 14
Views: 427

Re: Lcd screen recommendations

Gavinmc42 wrote:
Sun Jun 06, 2021 9:45 pm
For that resolution, I use the Neosec TinyLCD35. it's 3.5" diagonal
Is fps important?
A 3.2" 320x240 has half the pixel is not much smaller and hence a reasonable fps.
For my uses, fps doesn't matter. I'd rather have the higher resolution. (Main use is as a name badge.)
by W. H. Heydt
Sun Jun 06, 2021 5:24 pm
Forum: Advanced users
Topic: What's /usr/bin/dash and why should I care?
Replies: 17
Views: 497

Re: What's /usr/bin/dash and why should I care?

(I really must create an alias for "zsh -c 'ls -d *(/)'".))) You can change your default shell by editing /etc/passwrd. (It's the last parameter on the line for the ID you're using.) There are probably more "official" ways to make the change (and, undoubtedly, someone will come ...
by W. H. Heydt
Sun Jun 06, 2021 5:18 pm
Forum: Beginners
Topic: What should I get?
Replies: 13
Views: 426

Re: What should I get?

Greetings from a fellow retired programmer (applications, not system, in my case). First suggestion I would add is...get a Pi set up for *each* of them, even if they're in the same household. That way they won't be competing for time using their Pis. For monitors... Look around. If you, or their par...
by W. H. Heydt
Sun Jun 06, 2021 5:02 pm
Forum: General discussion
Topic: Corporate identity Raspberry pi
Replies: 42
Views: 1457

Re: Corporate identity Raspberry pi

I should probably mention that, while I don't wear t-shirts with images or slogans on them, my wife does. Most of hers are cat related. If the OP can come up with t-shirts that manage to combine Pis and cats, he might have something.
by W. H. Heydt
Sun Jun 06, 2021 4:58 pm
Forum: General discussion
Topic: Lcd screen recommendations
Replies: 14
Views: 427

Re: Lcd screen recommendations

350 x 350 is a weird size. 480 x 320, 320 x 240 are more normal, about 2.4 - 3.5" It could be a smart watch display? There is a 400 x 400 Hyper Pixel. Okay than 480 x 320 For that resolution, I use the Neosec TinyLCD35. it's 3.5" diagonal. Adafruit has (or used to have) one that size. I t...
by W. H. Heydt
Sun Jun 06, 2021 4:54 pm
Forum: General discussion
Topic: Power Pi from a USB port on a power strip?
Replies: 1
Views: 104

Re: Power Pi from a USB port on a power strip?

There are several factors here. The first is: What model Pi are you using? The current requirements vary by model. It is likely that a Pi0/Pi0W would be quite happy with your set up. Second is: What is the rated output of the power bars USB port? Default up to USB 2 is 500mA, and that will run a Pi ...
by W. H. Heydt
Sun Jun 06, 2021 4:57 am
Forum: General discussion
Topic: Lcd screen recommendations
Replies: 14
Views: 427

Re: Lcd screen recommendations

Around 350 x 350 Can we get a unit of measure to go with that? 4 cm x 5 cm or 3 x 4 cm Most LCD sizes are given as the diagonal of the screen, and secondarily, the pixel dimension. For instance, the monitor in front me is 27 inches with a resolution of 1920x1280. I have a number of 19" 1280x10...

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