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by hippy
Mon Jan 11, 2021 2:50 pm
Forum: Bare metal, Assembly language
Topic: Is the Raspberry Pi 400 kit a good bit of hardware to learn OS development?
Replies: 9
Views: 655

Re: Is the Raspberry Pi 400 kit a good bit of hardware to learn OS development?

Cromulent wrote:
Sun Jan 10, 2021 7:17 pm
Are there data sheets available for free for absolutely all of the components used?
No. I don't think there's even a published schematic and, if there were, it would unlikely be a complete schematic.
by hippy
Mon Jan 11, 2021 2:45 pm
Forum: Python
Topic: Pylint not working in pi@raspberrypi:~ $
Replies: 3
Views: 181

Re: Pylint not working in pi@raspberrypi:~ $

This works for me ...

Code: Select all

pi@Pi3B:~ $ pylint3 --version
pylint3 2.2.2
astroid 2.1.0
Python 3.7.3 (default, Jul 25 2020, 13:03:44) 
[GCC 8.3.0]
Not sure how I came to have that, probably "sudo pip3 install pylint".
by hippy
Sun Jan 10, 2021 4:41 pm
Forum: Advanced users
Topic: Disable headless wifi setup
Replies: 5
Views: 150

Re: Disable headless wifi setup

bls wrote:
Sun Jan 10, 2021 3:29 pm
That said, not clear what the actual problem is here. :roll:
Me neither. Perhaps the OP could detail what situation they are trying to mitigate against.
by hippy
Sun Jan 10, 2021 2:49 pm
Forum: Advanced users
Topic: Powering Pi 4 from header
Replies: 11
Views: 320

Re: Powering Pi 4 from header

In principle "yes". How much current does your touchscreen require ?
by hippy
Sun Jan 10, 2021 2:45 pm
Forum: General programming discussion
Topic: I would like to have a barcode scanner that the kids could use to scan the groceries
Replies: 6
Views: 330

Re: I would like to have a barcode scanner that the kids could use to scan the groceries

I was lucky enough to pick up a point of sale barcode scanner which has an RS232 connector which was easy enough to use with my Pi using a USB-to-RS232 adapter. Something like that, or appearing as a serial over USB device, is what I would recommend - https://www.ers-online.co.uk/o909/mk3780-61c41-h...
by hippy
Sat Jan 09, 2021 1:17 pm
Forum: Automation, sensing and robotics
Topic: Is there a GPIO cable length limit.
Replies: 12
Views: 322

Re: Is there a GPIO cable length limit.

It's unlikely that twisted pair would be suitable for GPIO, especially for your 150cm cables. Twisted pair would likely mess up the signals. I would have said the opposite and can't really see a problem with GPIO over 1.5 metre of twisted pair. I have run a modulated IR LED over 10 metre of twisted...
by hippy
Sat Jan 09, 2021 12:58 pm
Forum: Android
Topic: Running android apps on Raspberry
Replies: 5
Views: 381

Re: Running android apps on Raspberry

'Anbox' may be worth looking at.
by hippy
Fri Jan 08, 2021 2:22 pm
Forum: Off topic discussion
Topic: If only...
Replies: 92
Views: 4579

Re: If only...

Sounds like my £15 Android phone fulfils all the requirements, and one can buy at least ten of those for the price of a Pi 400 plus monitor and webcam. Where can I get a phone so cheap? I got mine from Argos in the UK, and paid £20 for an unlocked better specified device from Sainsbury's. One doesn...
by hippy
Fri Jan 08, 2021 2:04 pm
Forum: Advanced users
Topic: Is it possible to change an USB address?
Replies: 11
Views: 441

Re: Is it possible to change an USB address?

I think than maybe giving a different address to the USB serial might work. Can it be done? How? Can you explain what you mean by "different address" when it comes to USB or a USB serial port ? Are you talking about the "/dev/ttyACM0" name or something else ? The better you can ...
by hippy
Thu Jan 07, 2021 9:36 pm
Forum: Off topic discussion
Topic: If only...
Replies: 92
Views: 4579

Re: If only...

The UK government has addressed the issue of lack of resources for remote learning; Schools will be kept open for those students -

https://www.bbc.co.uk/news/education-55565537

:roll:
by hippy
Thu Jan 07, 2021 2:15 pm
Forum: Off topic discussion
Topic: If only...
Replies: 92
Views: 4579

Re: If only...

As I pointed out in another post, at least locally, everything is done in a browser. The only things a "Distance Learning" package needs are a web cam and an audio input port (and that can get just a bit tricky). Sounds like my £15 Android phone fulfils all the requirements, and one can b...
by hippy
Thu Jan 07, 2021 2:04 pm
Forum: Troubleshooting
Topic: Pi 400 broke already?
Replies: 12
Views: 408

Re: Pi 400 broke already?

I would guess bringing 5V to gpio pin could kill the GPIO functionality (of this pin or related pins) but not whole device. The problem is 5V can pass through internal ESD diodes and silicon connected to the GPIO pin and onto the internal power rails, raising that above safe levels, and damaging ot...
by hippy
Wed Jan 06, 2021 2:03 pm
Forum: Beginners
Topic: fdisk (w) does not save partition changes
Replies: 13
Views: 290

Re: fdisk (w) does not save partition changes

(*) Yes, apparently, there is an image version of PINN - which seems to me to defeat the primary purpose of NOOBS/PINN - which is to be installable w/o using any wacky "image" type utility. I believe the PINN image came about to make life easier for those who could not handle the 'drag an...
by hippy
Wed Jan 06, 2021 1:49 pm
Forum: General discussion
Topic: Control my tv with raspberry Pi from a remote location
Replies: 4
Views: 164

Re: Control my tv with raspberry Pi from a remote location

A Python Flask web application shares the webpage with the remote device and receives the requests which then send out the IR commands to LIRC. That would be my approach. A web server can be more easily connected to from another PC or phone, locally or remote, without the faff of having to set-up M...
by hippy
Wed Jan 06, 2021 12:54 pm
Forum: Troubleshooting
Topic: Dead Pi4b
Replies: 8
Views: 279

Re: Dead Pi4b

I've never had a Pi die on me. Nor me and it seems most people don't but there were a number of people who suffered unexplained failures with 3B+'s and a number of "Green light of death" issues with the 4B. The numbers involved are very low compared to the number of Pi's sold so perhaps j...
by hippy
Wed Jan 06, 2021 12:36 pm
Forum: Off topic discussion
Topic: If only...
Replies: 92
Views: 4579

Re: If only...

Give the kids computers and a problem and let them do they own tech support ;) That may be fine if the goal is to teach kids computing but we are talking about providing a tool which allows distance learning here. There should be no necessity for the kids targeted to do anything other than turn it ...
by hippy
Wed Jan 06, 2021 12:28 pm
Forum: Off topic discussion
Topic: I need to know a method to archive my emails.
Replies: 2
Views: 390

Re: Need advice

Copy it to a USB hard disk.
by hippy
Tue Jan 05, 2021 7:43 pm
Forum: Networking and servers
Topic: Using rpi in rural areas
Replies: 4
Views: 357

Re: Using rpi in rural areas

I frequently used Pi in rural areas and if needed for i.e. for a classroom I did set the pi4 up as an access point to allow WiFi to it. I have always favoured a separate WiFi router acting as the access point. The advantage there with the right choice is one can add external antennas, even directio...
by hippy
Tue Jan 05, 2021 7:24 pm
Forum: General discussion
Topic: I have a product idea for older people, and want to use a PI for a sample - need help!
Replies: 52
Views: 1622

Re: I have a product idea for older people, and want to use a PI for a sample - need help!

YorkshireDave wrote:
Tue Jan 05, 2021 4:31 pm
the world is sadly, fundamentally, divided into two types of people - the givers and the takers
Including those who altruistically want to help people and those who want to profit from helping people.

Good luck with your venture.
by hippy
Tue Jan 05, 2021 2:36 pm
Forum: Advanced users
Topic: Ondemand Governor
Replies: 12
Views: 430

Re: Ondemand Governor

So I guess I can read that "ondemand" does indeed scale frequencies based on load regardless of whether the RPi is set to overclock? That's what I see. My Pi 3B isn't over-clocked, presumably is using 'ondemand', and and its frequency rises from 600MHz to whatever when programs are run, t...
by hippy
Tue Jan 05, 2021 2:03 pm
Forum: Off topic discussion
Topic: If only...
Replies: 92
Views: 4579

Re: If only...

The more I think about this, it does seem that the Pi 400 with suitable web camera would be an ideal solution to the distance learning problem at all levels in education. Is there any specification or requirements list anywhere which details what a computer suitable for distance learning must and s...
by hippy
Tue Jan 05, 2021 12:58 pm
Forum: General discussion
Topic: Pi Laptop - pibook!
Replies: 9
Views: 569

Re: Pi Laptop - pibook!

Is a pi laptop the next logical step? I was discussing this with some friends the other day. While it seems like the natural evolution of the Pi 400 it's not quite so simple as "attach a screen and call it a laptop". One of the not immediately obvious problems is weight; having to make th...
by hippy
Tue Jan 05, 2021 12:29 pm
Forum: General discussion
Topic: I have a product idea for older people, and want to use a PI for a sample - need help!
Replies: 52
Views: 1622

Re: I have a product idea for older people, and want to use a PI for a sample - need help!

Patently you've not read any of the previous posts hippy. I have read them all. And more than once. Beyond having a screen, LED's, switches, playing sounds, reading "std sensors" - with no explanation of what those sensors are; other than it being intended to help older people nothing des...
by hippy
Mon Jan 04, 2021 7:07 pm
Forum: General discussion
Topic: X86-64 on my PI 4B 8GB
Replies: 12
Views: 683

Re: X86-64 on my PI 4B 8GB

pasdechance wrote:
Mon Jan 04, 2021 4:26 pm
Have you looked into using Box86?
Box86 only runs 32-bit code.
by hippy
Mon Jan 04, 2021 6:48 pm
Forum: C/C++
Topic: compiler warnings about operator precedences (chess engine)
Replies: 68
Views: 1788

Re: compiler warnings about operator precedences

#define W while seem to imply that it is deliberate obfuscation. I wouldn't say "deliberate obfuscation" when the attempt is to keep the number of characters typed as code below 2048. It's more a compression which consequently leads to unreadability. If this thread had started with "...

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