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by rpdom
Fri Dec 03, 2021 7:22 am
Forum: Advanced users
Topic: Using ULN2003AN for audio input switch
Replies: 11
Views: 339

Re: Using ULN2003AN for audio input switch

Each relay coil takes 30 mA when activated so if you never have more than 4 active the maximum demand will be 120 mA. A Zero itself has a fairly modest current demand so if there is nothing else but the Zero, the driver chips and the relays powered from the 5 Volt supply then a PSU on the right sid...
by rpdom
Fri Dec 03, 2021 7:17 am
Forum: General
Topic: PI PICO basics, getting started.
Replies: 7
Views: 246

Re: PI PICO basics, getting started.

badflash wrote:
Fri Dec 03, 2021 1:47 am
Thanks a lot. You folks are no help at all.
Read drgeoff's post. Look at the questions. Answer them if you can. Then you might get more help.
We can only go on what you have told us and so far that isn't enough to be able to help you.
by rpdom
Thu Dec 02, 2021 7:16 pm
Forum: General discussion
Topic: Pi Zero 2 W Maximum USB Current Draw
Replies: 10
Views: 468

Re: Pi Zero 2 W Maximum USB Current Draw

My understanding came to that value is because from researching online the specifications for a USB 1.0 and 2.0 standard downstream port delivers up to 500 mA. The original Pi 1B had a current limit of 140mA on each of its two USB ports because of fuses. Later versions of the same model had no limi...
by rpdom
Thu Dec 02, 2021 9:03 am
Forum: Networking and servers
Topic: Build a LampServer with Wordpress with Custom Domain Name
Replies: 1
Views: 94

Re: Build a LampServer with Wordpress with Custom Domain Name

On the Go Daddy Site you can set up DNS to point to your Pi server.
by rpdom
Wed Dec 01, 2021 4:39 pm
Forum: C/C++
Topic: Compiled code on amrv7l do no longer run on armv6l since PiOS 11
Replies: 29
Views: 852

Re: Compiled code on amrv7l do no longer run on armv6l since PiOS 11

rocrail wrote:
Wed Dec 01, 2021 4:35 pm
The only diff is that on the Zero 2W the Lite version is installed.
So libc6-dev-armhf-cross is not included by default in Lite, but is included in the standard version. There's your answer.
by rpdom
Wed Dec 01, 2021 4:32 pm
Forum: C/C++
Topic: Compiled code on amrv7l do no longer run on armv6l since PiOS 11
Replies: 29
Views: 852

Re: Compiled code on amrv7l do no longer run on armv6l since PiOS 11

So the package system makes a different choice for the Zero 2W. The APT package system will only look at the Architecture of the system it is run on. For 32-bit Pi OS that is armhf for all models of Pi. It doesn't care if it is a Zero, 1B, 3B+ or 4B (unless you are running the 64-bit OS). Did you i...
by rpdom
Wed Dec 01, 2021 7:22 am
Forum: Troubleshooting
Topic: Problem upgrading a headless Pi 2B from buster to bullseye
Replies: 1
Views: 61

Re: Problem upgrading a headless Pi 2B from buster to bullseye

I'd really expect that the one thing an OS upgrade would NOT do is to change access to the network port, so must ask if you've tried either: a) Making a clean bullseye install on an RPi, booting it without display, keyboard or mouse attached and logging in over an ssh link. b) Upgrading a headless ...
by rpdom
Wed Dec 01, 2021 7:12 am
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 29
Views: 1056

Re: Tinier2040

Do you have access to a 3D printer? I was wondering if you could design and print a simple gear system for the motors to have them at 90 degrees to the wheels, so they would sit longways under the main boards and both wheels could be level rather than one behind the other. I don't know if that would...
by rpdom
Wed Dec 01, 2021 6:22 am
Forum: General discussion
Topic: utilize a Pi2 Stretch SD also for 3B or 3B+ ?
Replies: 4
Views: 174

Re: utilize a Pi2 Stretch SD also for 3B or 3B+ ?

If that doesn't work (which it probably should), you can copy the contents of /boot (apart from config.txt and cmdline.txt) and /lib/modules from a newer card and that should get your Pi running. You might have to resize the /boot partition to fiyt all the files in, but that is easy with gparted. I ...
by rpdom
Tue Nov 30, 2021 8:23 pm
Forum: Beginners
Topic: is it possible to boot over wifi yet?
Replies: 26
Views: 839

Re: is it possible to boot over wifi yet?

jamesh wrote:
Tue Nov 30, 2021 6:00 pm
Basically this. Getting a USB stack in there is hard enough, adding wireless is just not possible, and it's such a limited use case anyway, compared with USB.
I'm still waiting for wireless PoE!
by rpdom
Tue Nov 30, 2021 4:53 pm
Forum: Off topic discussion
Topic: More RPT floatation rumours
Replies: 55
Views: 2445

Re: More RPT floatation rumours

Not sure of how this all works in the UK. Might not be what usually happens in my part of the world? It was something like that. I could buy x amount of shares at a pre-release price, then the same amount again at the same price when they went "live", plus I had to buy some more at the fu...
by rpdom
Tue Nov 30, 2021 2:46 pm
Forum: Troubleshooting
Topic: page not found.. for a while
Replies: 4
Views: 146

Re: page not found.. for a while

sounds like dns issue on a local address. you can try using your hosts file. Unlikely. The page address is using an IP address. DNS should not be involved. the browser response il something like "the page was not found". Check the Apache server logs to see what the actual error was. That ...
by rpdom
Tue Nov 30, 2021 6:37 am
Forum: Off topic discussion
Topic: More RPT floatation rumours
Replies: 55
Views: 2445

Re: More RPT floatation rumours

I'd be tempted to buy shares in RPT. It not a thing I have a lot of experience with, but what I have done was very profitable.

If the RPT employees who are getting shares get anywhere near the deal I got from a company I worked for, they will be very happy, and they deserve it.
by rpdom
Mon Nov 29, 2021 9:03 pm
Forum: Troubleshooting
Topic: Anydesk installs but does not run on Raspian
Replies: 5
Views: 149

Re: Anydesk installs but does not run on Raspian

ARMHF is the normal 32-bit Raspberry Pi OS.
Pi 4/400 probably means Pi4 or Pi 400

Therefore Anydesk should run on standard Pi 4B with default Raspberry Pi OS 32-bit.
by rpdom
Mon Nov 29, 2021 8:50 pm
Forum: Troubleshooting
Topic: One Repository, Two Pis, Different Results
Replies: 1
Views: 70

Re: One Repository, Two Pis, Different Results

I'm guessing the mirror was in the middle of an update at the time and the file had been deleted to later be replaced by a new one. Try again later. One other thing - Stretch is old and unsupported now. It would be better if you could rebuild your system on the latest Bullseye release. Actually, Str...
by rpdom
Mon Nov 29, 2021 6:17 pm
Forum: Troubleshooting
Topic: Trying to understand what I did with my GPIO...
Replies: 14
Views: 366

Re: Trying to understand what I did with my GPIO...

Would you be so kind and explain to me why default level of GPIO 5 changed from 1 to 0 and now my buzzer beeps all the time? I am 100% sure that on GPIO 5 it was not the case before i messed it up. That is a very good question. The answer is: I don't know. :( What I get for that command is GPIO 5: ...
by rpdom
Mon Nov 29, 2021 5:01 pm
Forum: Troubleshooting
Topic: Trying to understand what I did with my GPIO...
Replies: 14
Views: 366

Re: Trying to understand what I did with my GPIO...

4k3or3et wrote:
Mon Nov 29, 2021 4:42 pm
you can clearly see that GPIO5 is on pin 29 and GPIO6 is on pin 31.

raspi-gpio get 5,6 will give you info about GPIO3 and ground is not it?
Why would you think that?

raspi-gpio only deals in internal GPIO numbers. Not physical pin numbers.
by rpdom
Mon Nov 29, 2021 1:47 pm
Forum: Python
Topic: Phyton3 not downloading
Replies: 24
Views: 600

Re: Phyton3 not downloading

DougieLawson wrote:
Mon Nov 29, 2021 1:28 pm
Then a simple python command will run python3.
That's bad advice which could break things in future releases.
I'd link python to python3, not the specific python3.9.
by rpdom
Mon Nov 29, 2021 7:24 am
Forum: Beginners
Topic: Imager is slow, like... hours.
Replies: 16
Views: 463

Re: Imager is slow, like... hours.

I've got a relatively recent Dell laptop. The SD card slot is basically useless. I always use a USB adapter. Dell (and everyone else with rubbish adapters) really should be ashamed of themselves. I guess they vary. The Dell Precision laptop that I used to use was fine for SD cards. I currently use ...
by rpdom
Sat Nov 27, 2021 6:46 pm
Forum: Python
Topic: Phyton3 not downloading
Replies: 24
Views: 600

Re: Phyton3 not downloading

B.Goode wrote:
Sat Nov 27, 2021 6:44 pm
What do you think the package "phyton3" contains, and why do you need to install it?
A spellchecker? ;)
by rpdom
Sat Nov 27, 2021 3:00 pm
Forum: Automation, sensing and robotics
Topic: 12v heater for miniature green house?
Replies: 11
Views: 545

Re: 12v heater for miniature green house?

Mendel wrote:
Sat Nov 27, 2021 10:07 am
Look at exotic pet shops. Their are lots of options there (heat mats, ceramic bulbs etc.) Specifically designed for heating tanks.
Those are mostly mains voltage though.
by rpdom
Sat Nov 27, 2021 7:23 am
Forum: Troubleshooting
Topic: Two USB ports not working Raspberry Pi 3B+
Replies: 10
Views: 262

Re: Two USB ports not working Raspberry Pi 3B+

Ok, what is the output of "lsusb -t". It should look like this on a 3B+ (with nothing plugged in): pi@raspi4:~ $ lsusb -t /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 3, If 0, Class=Hub, Driver=hub/...
by rpdom
Sat Nov 27, 2021 7:15 am
Forum: Other RP2040 boards
Topic: Tinier2040
Replies: 29
Views: 1056

Re: Tinier2040

Could you reduce the height even further by removing the buttons and USB from the tiny2040? If they are still required, perhaps bring them out on thin wires?
by rpdom
Fri Nov 26, 2021 3:37 pm
Forum: Troubleshooting
Topic: Two USB ports not working Raspberry Pi 3B+
Replies: 10
Views: 262

Re: Two USB ports not working Raspberry Pi 3B+

Is your Ethernet working? The 3B+ has a slightly different USB layout to previous models. Instead of a 5-port USB hub chip with one port driving ethernet, it has a 4-port hub for two of the USB sockets which drives a 3-port hub that drives the other two and the ethernet adaptor. If the first hub had...
by rpdom
Fri Nov 26, 2021 6:13 am
Forum: Raspberry Pi OS
Topic: Raspbian / Raspi OS updates -- on releases and kernels
Replies: 8
Views: 359

Re: Raspbian / Raspi OS updates -- on releases and kernels

2) Offhand, I do not know where rpi-update places its backups. It's been a while since I ran rpi-update on anything, but poking through the code (it is a bash script), it looks like it copies the contents of /boot/ into /boot.bak/ and /lib/modules/$(uname -r)/ to /lib/modules/$(uname -r).bak/ . Cop...

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