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by W. H. Heydt
Sun Oct 21, 2018 3:48 pm
Forum: General discussion
Topic: Power supply for Rpi 3
Replies: 10
Views: 278

Re: Power supply for Rpi 3

the £2 poundland 5v transformer usb plugs sustain a 2.4a draw according to big clives utubes iirc, i have 3 x headless pi-0-w s running off them .. How big are the transformers? And how long is the cord? My Raspberry is about 1.2m away from a socket. If the Pi is too far from an outlet for the USB ...
by W. H. Heydt
Sat Oct 20, 2018 10:05 pm
Forum: General discussion
Topic: do I need an SD-card larger than 32GB?
Replies: 7
Views: 194

Re: nooby

Welcome to the Forums.

I've been using 8GB cards with Pis for years...ever since the Raspbian build got to big to use 4GB cards.
by W. H. Heydt
Sat Oct 20, 2018 8:33 pm
Forum: General discussion
Topic: Power supply for Rpi 3
Replies: 10
Views: 278

Re: Power supply for Rpi 3

Hello, does anyone know good power supplies that are cheap from the RPi sellers? I find paying 8 pound for a power supply is a bit much. I have loads of 1 Amp power supplies around the home, apple chargers, micro usb, etc that might be able to power a Rpi 3 but not sufficiently. It is not expensive...
by W. H. Heydt
Sat Oct 20, 2018 4:35 am
Forum: General discussion
Topic: Rpi 0W bulk buy
Replies: 4
Views: 178

Re: Rpi 0W bulk buy

HawaiianPi wrote:
Sat Oct 20, 2018 3:01 am
Hopefully he'll see this post. If not, you could try reporting your post so at least some mod will see it and pass it along to jamesh.
I did that for him.
by W. H. Heydt
Sat Oct 20, 2018 2:27 am
Forum: Advanced users
Topic: SSD caching in raspbian?
Replies: 1
Views: 104

Re: SSD caching in raspbian?

I seriously doubt it would help Pi very much, primarily for two reasons. The first being that, if you need that much mass storage, SSDs are now cheap enough to just use an SSD (very recently I bought a 500GB Samsung EVO 860 for just under $90, for instance), so there is no need to cache from an HDD ...
by W. H. Heydt
Sat Oct 20, 2018 12:49 am
Forum: General discussion
Topic: Rechargeable, portable power alternatives to Lipo and Lithium Ion Batteries
Replies: 3
Views: 130

Re: Rechargeable, portable power alternatives to Lipo and Lithium Ion Batteries

Some possible alternatives to alkaline (the common AAA, A, C, D, 9v units) are Nickel Metal Hydride (NiMH), Nickel Cadmium (NiCad), and Lithium Iron Phosphate (LiFePO4, or LFP) come to mind. If money isn't a problem, you could consider Hydrogen Fuel Cell. Not a rechargeable battery, but a primary po...
by W. H. Heydt
Fri Oct 19, 2018 7:43 pm
Forum: General discussion
Topic: SD card write count?
Replies: 15
Views: 423

Re: SD card write count?

I was looking at a short "Wow...look at that" blurb in MaximumPC today. They were talking about a PNY 512GB microSD card. It has a "lifetime" guarantee. It also costs $360. Makes one wonder how long it would really last if used in a Pi (and if they would actually honor that "lifetime" if used that w...
by W. H. Heydt
Fri Oct 19, 2018 1:41 pm
Forum: General discussion
Topic: PiDrive SSD replacement
Replies: 3
Views: 217

Re: PiDrive SSD replacement

Thanks for this. I picked up a CM3 mount from WD before they shut the lab and been thinking about a normal SSD but this is a cheaper option when put onto a Hong Kong £2 SATA to M.2 board :D I've had a bit of a problem with the WD SATA Adapter. The one I go when they first came up support boot over ...
by W. H. Heydt
Fri Oct 19, 2018 1:38 pm
Forum: General discussion
Topic: SD card write count?
Replies: 15
Views: 423

Re: SD card write count?

The german c't magazine performed such a test on SSDs some months ago. The article was quite long, so I skipped to the conclusion: in normal use, they should last for years. But under what conditions? Using an SD card as a computer system mass storage device doesn't usually fall under "normal use".
by W. H. Heydt
Fri Oct 19, 2018 4:15 am
Forum: Beginners
Topic: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?
Replies: 8
Views: 188

Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

blueagent004 wrote:
Fri Oct 19, 2018 1:40 am
i've read on the official wiki that a 5V/2000mA power supply is recommended for the Raspberry Pi 3 model B+.
Say what? The recommended power for a Pi3B+ is 5v, 2.5A. Whoever wrote 2A is blowing smoke.
by W. H. Heydt
Fri Oct 19, 2018 1:10 am
Forum: Beginners
Topic: need help on simple script
Replies: 5
Views: 142

Re: need help on simple script

okey so i got it working but i every 5 minutes the .txt file gets overwritten i want it to write every 5 minutes, and is there a fast way to get the time and date on the code line?. and is there a way to stop crontab operations? i am having some problems with my internet provider and i am collectin...
by W. H. Heydt
Fri Oct 19, 2018 12:30 am
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

Yeah... Arbitrary precision...which one could do natively on the IBM 1620, up to the limit of how much memory you had. As for programming such things, I wrote a FORTRAN program to run on a CDC 6400 to calculate e to 5000 places. It took 11 CP minutes to run. (That was around 1968.) I think computin...
by W. H. Heydt
Thu Oct 18, 2018 8:29 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

Many years ago, when "state of the art" budget computing was Ti-58 programmable calculator, I wrote a program to calculate perfect numbers with something like 10 times the number of digits that the calculator handled natively. The code was possibly non-trivial, but not that complex. It would have b...
by W. H. Heydt
Thu Oct 18, 2018 2:02 am
Forum: Off topic discussion
Topic: When will Pi Zero W be updated?
Replies: 7
Views: 340

Re: When will Pi Zero W be updated?

Hi, Features that would be beneficial: 0. Dual-core CPU 1. More RAM 2. Second USB port 3. Battery charging/discharging circuit 4. Real time clock and watch battery for it 5. Remove Composite video 6. Add 16-bit audio output and headphone jack The RPT/RPF never tells... As for your points... 0. Not ...
by W. H. Heydt
Thu Oct 18, 2018 1:42 am
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

somehow, don't ask *me* how--there will be a newer version of the Pi0/Pi0W that is also compatible. What makes the Pi Zero interesting for many is more the small size and low power consumption than the small price. With existing 64-bit SOC packages, where to place the memory becomes a problem unles...
by W. H. Heydt
Thu Oct 18, 2018 1:24 am
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

W. H. Heydt, I know what you mean. But I don't understand why it is so. The 64 bit architecture started to go mainstream with the AMD Athlon in 1999. Very soon there were 64 bit Linux distributions. All those thousands of packages they use worked, or were soon fixed up to work, on both 32 and 64 bi...
by W. H. Heydt
Wed Oct 17, 2018 8:52 pm
Forum: General discussion
Topic: Combining USB Ethernet ports
Replies: 5
Views: 145

Re: Combining USB Ethernet ports

First...you can't "configure a USB port as an Ethernet port", so I presume that you added a USB to Ethernet adapter. You can if it's a pi ZERO and you use ethernet gadget mode ;) Just you go and try wiring up a Cat-5 cable with an RJ-45 on one end and a micro-USB on the other end and tell me how we...
by W. H. Heydt
Wed Oct 17, 2018 8:47 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

Therefore what I see as necessary to a general migration to 64-bit is the launch of... a 64-bit capable versions of the Pi0, Pi0W, and A+. That last one is---at least in theory--feasible now. The first two...not so much. And based on what JamesH said above potentially for a fully operational 64-bit...
by W. H. Heydt
Wed Oct 17, 2018 8:28 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

W. H. Heydt, When will Raspbian be 64-bit? Some time before January 2038. I guess you are referring to the rollover the Unix time tick there. That is not a good reason to go to 64 bits. That issue is already catered for even on 32 bit systems. That was what I had in mind. On the other hand, there i...
by W. H. Heydt
Wed Oct 17, 2018 8:12 pm
Forum: General discussion
Topic: Combining USB Ethernet ports
Replies: 5
Views: 145

Re: Combining USB Ethernet ports

First...you can't "configure a USB port as an Ethernet port", so I presume that you added a USB to Ethernet adapter. Second...what you probably want to do is to connect the Ethernet adapters of each of the 4 Pis to an Ethernet switch and then connect that to either your LAN (router or upstream switc...
by W. H. Heydt
Wed Oct 17, 2018 5:23 pm
Forum: General discussion
Topic: SD card write count?
Replies: 15
Views: 423

Re: SD card write count?

It isn't that simple. There is an internal processor in the SD card that will attempt to even out the number of write cycles (look up "wear leveling") across the blocks of flash memory. This also means that a larger/less full card, will wear slower than an small/full card.
by W. H. Heydt
Wed Oct 17, 2018 5:19 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 111
Views: 11123

Re: 64-bit operating system

When will Raspbian be 64-bit? Some time before January 2038. What "roadblocks" are there preventing it from happening soon? There is both a large installed base and some popular versions of the Pi that can't run 64-bit. Therefore what I see as necessary to a general migration to 64-bit is the launch...
by W. H. Heydt
Wed Oct 17, 2018 2:48 am
Forum: General discussion
Topic: Using VGA monitors with the Pi 3
Replies: 6
Views: 258

Re: Using VGA monitors with the Pi 3

So, I'm not sure how to change their settings if I can't get them to display on the tablets or the monitors. Begin with the suggestions already offered. And, FYI, if you have enabled ssh, you can connect to a Pi remotely and edit the critical file, /boot/config.txt . Edit to add... Bear in mind tha...
by W. H. Heydt
Tue Oct 16, 2018 1:36 pm
Forum: Beginners
Topic: Attendance system with PI
Replies: 2
Views: 68

Re: Attendance system with PI

The most common way to set up your web-based system on a Linux system is to use the "LAMP Stack".
by W. H. Heydt
Tue Oct 16, 2018 1:45 am
Forum: General discussion
Topic: Give my RPi 3 a life please
Replies: 18
Views: 727

Re: Give my RPi 3 a life please

With just speakers you could also tell the time (speech, cuckoo clock). Also possibly triggered by some sensors (light? motion?) to avoid sound at night or when nobody is in a room. I've considered working up a way to have it make audible time notes using a "ship's bell" sound and pattern. You do h...

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